CC 2024-08-27_11a NCMA Annual Report 2023 Item 11.a.
MEMORANDUM
TO: City Council
FROM: Bill Robeson, Assistant City Manager/Public Works Director
BY: Shane Taylor, Utilities Manager
SUBJECT: 2023 Annual Report for the Northern Cities Management Area
DATE: August 27, 2024
RECOMMENDATION:
Receive and file the 2023 Northern Cities Management Area (NCMA) Annual Report.
IMPACT ON FINANCIAL AND PERSONNEL RESOURCES:
Expenditures associated with the 2023 Annual Report in the amount of $106,600 are
budgeted in the Water Fund, which is paid as part of water rates.
BACKGROUND:
A 2008 California Superior Court Judgment After Trial (Judgment) adjudicated the rights
to the Santa Maria River Groundwater Basin (SMRGB) t o various parties. That ruling
established three management areas with in the SMRGB, including the Northern Cities
Management Area (NCMA), the Nipomo Mesa Management Area (NMMA) and the Santa
Maria Valley Management Area (SMVMA). The City of Arroyo Grande is part of the
NCMA, along with the Cities of Grover Beach, Pismo Beach, and the Oceano Community
Services District. Further, the Judgment mandated that “a monitoring program be
established in each of the three Management Areas to collect and analyze data r egarding
water supply and demand conditions,” and an annual report be filed with the court within
120 days after the end of each calendar year.
In 2009, a technical group of the NCMA jurisdictions was formed to meet on a monthly
basis to coordinate water sampling and preparation of the annual report required by the
Court’s ruling in the SMGB Adjudication. The NCMA Technical Group (NCMA TG) jointly
selects consultants to provide engineering and water resource technical services in order
to meet the Court ordered requirements for the Santa Maria River Groundwater Basin, as
well as for overall water resource planning.
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Item 11.a.
City Council
2023 Annual Report for the Northern Cities Management Area
August 27, 2024
Page 2
The 2005 Stipulation for the Santa Maria River Groundwater Basin Adjudication, later
affirmed in the 2008 Judgment, requires that each of the m onitoring areas identified in the
adjudication develop a monitoring program that is sufficient to determine:
Land and water uses in the basin;
Sources of supply to meet those uses;
Groundwater conditions (including water levels and water quality);
Amount of disposition of developed water supplies; and
Amount of disposition of other sources of water supply in the NCMA.
The Stipulation additionally requires that each of the Management Areas prepare an
annual report, to be submitted to the Court, which summa rizes the results of the
monitoring program, changes in groundwater supplies, and any threats to groundwater
supplies.
In 2009, the NCMA TG selected Todd Engineers to initiate the NCMA monitoring program
which included collection of water quality samples from coastal sentry wells, and to begin
development of the 2009 NCMA Annual Report. GEI Consulting Engineers and Scientists
performed the monitoring and prepared reports for 2010 -2012, Fugro Consultants for
2013-2015, and GSI since 2016; all of which have been successfully submitted to the
court.
Through the NCMA TG, member agencies work together to manage the SMRGB and
meet the annual reporting requirements of the Judgment. The 2023 NCMA Annual
Report, prepared by GSI Water Solutions, Inc. (GSI), was filed with the Court in April 2024
after being reviewed by the City’s special water counsel.
ANALYSIS OF ISSUES:
The NCMA TG is currently facilitated by Water Systems Consulting, Inc. (WSC).
Together, the NCMA TG and WSC hired GSI to compile the data gath ered during
quarterly groundwater monitoring and to create the 2023 NCMA Annual Report. A copy
of the full report is provided in Attachment 1 and is available for public viewing at the
Arroyo Grande Public Works Corporation Yard, 1375 Ash Street, and on th e City’s
website. The following list is a summary of the report’s highlights and important
information.
1. During 2023, water elevations generally increased throughout the NCMA.
2. The total water used in the NCMA in 2023 (surface, State water, groundwater, and
other water), including applied irrigation and private pumping by rural water uses,
was 7,403 Acre Feet (AF) compared to 8,577 AF in 2020, and is summarized below
in Table 1. Total groundwater pumping was 2,697 AF, which is 28% of the
“available” groundwater entitlement.
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Item 11.a.
City Council
2023 Annual Report for the Northern Cities Management Area
August 27, 2024
Page 3
Table 1: Total Water Used in the NCMA in 2023 in Acre-Feet (AF)
Lake Lopez
State Water
Ground
Water
Other
Supplies
Total
Arroyo Grande 1,867 0 69 0 1,936
Grover Beach 793 0 373 0 1,162
Pismo Beach 433 1,037 39 0 1,509
OCSD 400 176 53 0 629
Total Urban Use 3,493 1,213 534 0 5,240
Applied Irrigation 0 0 2,045 0 2,045
Rural Water Users 0 0 80 0 80
Non-potable
irrigation by
Arroyo Grande
0
0
38
0
38
Grand Total Used 3,493 1,213 2,697 0 7,403
3. During 2023, there were no indications of seawater intrusion.
4. Rainfall for the 2023 calendar year was approximately 150% of the long-term
average rainfall, with 23.75 inches of rain.
5. In 2023, the Deep Well Index started above the trigger valve with an index value
of more than 9 feet in January. The index valve continued to climb through early
April, peaking at over 12 feet, and then generally declined through early
September, reaching a low point just over 10 feet. Since September 2023, the
index valve has increased steadily, finishing the year at 12 feet.
6. Groundwater levels in the Basin increased in 2023, which represents a net
increase in groundwater storage. This increase from April 2022 to April 2023 was
approximately 3,610 Acre-Feet compared to 270 Acre-Feet the previous year. This
is the largest single-year increase in groundwater storage since tracking began in
2016.
7. There still is a reduction of subsurface inflow to the NCMA due to the pumping
depression near Black Lake Canyon in the NMMA. This has caused the
development of a landward gradient in the southern portion of the NCMA, which
creates conditions that could result in seawater intrusion.
ALTERNATIVES:
The following alternatives are provided for the Council’s consideration:
1. Receive and file the 2023 NCMA Annual Report; or
2. Provide other direction to staff.
ADVANTAGES:
The NCMA Annual Report is required by the Judgment entered in the Santa Maria
Groundwater Adjudication and includes important monitoring information pertinent to the
City’s groundwater supply.
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Item 11.a.
City Council
2023 Annual Report for the Northern Cities Management Area
August 27, 2024
Page 4
DISADVANTAGES:
No disadvantages have been identified.
ENVIRONMENTAL REVIEW:
No environmental review is required for this item.
PUBLIC NOTIFICATION AND COMMENTS:
The Agenda was posted at City Hall and on the City’s website in accordance with
Government Code Section 54954.2.
ATTACHMENTS:
1. NCMA 2023 Annual Report
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FINAL
Northern Cities Management Area Technical Group
Northern Cities Management Area
2023 Annual Monitoring Report
Prepared for
City of Arroyo Grande City of Grover Beach
Oceano Community Services District City of Pismo Beach
April 22, 2024
Prepared by:
GSI Water Solutions, Inc.
800 Quintana Road, Suite 2C, Morro Bay, CA 93442
Attachment 1
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Northern Cities Management Area
2023 Annual Monitoring Report
This report was prepared by the staff of GSI Water Solutions, Inc., in collaboration with GEI Consultants, Inc.,
under the supervision of professionals whose signatures appear below. The findings or professional opinions
were prepared in accordance with generally accepted professional engineering and geologic practice.
Nate Page, PG, CHG
Supervising Hydrogeologist
Project Manager
Dave O’Rourke, PG, CHG
Principal Hydrogeologist
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Contents
Executive Summary .................................................................................................................................................. 1
Groundwater Conditions ...................................................................................................................................... 1
Groundwater Levels ......................................................................................................................................... 1
Change in Groundwater in Storage ................................................................................................................. 2
Groundwater Quality ......................................................................................................................................... 3
Water Supply and Production/Deliveries ............................................................................................................ 3
Threats to Water Supply ....................................................................................................................................... 4
SECTION 1: Introduction........................................................................................................................................... 7
1.1 History of Litigation .................................................................................................................................. 7
1.2 Description of the NCMA Technical Group ........................................................................................... 10
1.3 NCMA Technical Group Mission Statement ......................................................................................... 11
1.4 Coordination with Management Areas ................................................................................................. 11
1.5 Development of Monitoring Program .................................................................................................... 12
1.6 Groundwater Monitoring Network ......................................................................................................... 13
1.7 Recent and Ongoing Strategic Initiatives ............................................................................................. 16
1.7.1 Strategic Plan .................................................................................................................................. 16
1.7.2 Central Coast Blue .......................................................................................................................... 16
1.7.3 Phase 1 Groundwater Model ......................................................................................................... 17
1.7.4 Update of the 2002 Groundwater Management Agreement ...................................................... 18
SECTION 2: Basin Setting....................................................................................................................................... 19
2.1 Setting ..................................................................................................................................................... 19
2.2 Precipitation ........................................................................................................................................... 19
2.3 Evapotranspiration ................................................................................................................................. 23
2.4 Geology and Hydrogeology .................................................................................................................... 23
2.5 Groundwater Flow .................................................................................................................................. 24
SECTION 3: Groundwater Conditions .................................................................................................................... 27
3.1 Groundwater Levels ............................................................................................................................... 27
3.1.1 Groundwater Level Contour Maps ................................................................................................. 27
3.1.2 Historical Water Level Trends ........................................................................................................ 30
3.1.3 Sentry Wells and the Deep Well Index .......................................................................................... 30
3.2 Change in Groundwater in Storage ....................................................................................................... 42
3.3 Water Quality .......................................................................................................................................... 45
3.3.1 Quarterly Groundwater Monitoring ................................................................................................ 45
3.3.2 Analytical Results Summary ........................................................................................................... 48
SECTION 4: Water Supply and Production/Delivery ............................................................................................. 55
4.1 Water Supply .......................................................................................................................................... 55
4.1.1 Lopez Lake ...................................................................................................................................... 55
4.1.2 State Water Project ........................................................................................................................ 58
4.1.3 Groundwater ................................................................................................................................... 60
4.1.4 Developed Water ............................................................................................................................ 62
4.1.5 Other Supplies ................................................................................................................................ 63
4.1.6 Total Water Supply Availability ....................................................................................................... 63
4.2 Water Use ............................................................................................................................................... 65
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4.2.1 Agricultural Water Supply Requirements ...................................................................................... 65
4.2.2 Rural Use ......................................................................................................................................... 73
4.2.3 Urban Production for Potable Use ................................................................................................. 74
4.2.4 2023 Groundwater Pumpage ........................................................................................................ 74
4.2.5 Changes in Water Production ........................................................................................................ 77
SECTION 5: Comparison of Water Supply and Water Production ........................................................................ 81
SECTION 6: Threats to Water Supply ..................................................................................................................... 83
6.1 Threats to Local Groundwater Supply ................................................................................................... 83
6.1.1 Declining Water Levels ................................................................................................................... 83
6.1.2 Seawater Intrusion ......................................................................................................................... 83
6.2 Threats to State Water Project Supply .................................................................................................. 88
6.3 Threats to Lopez Lake Water Supply .................................................................................................... 88
SECTION 7: Management Activities ....................................................................................................................... 89
7.1 Strategic Plan ......................................................................................................................................... 89
7.1.1 Purpose and Background ............................................................................................................... 89
7.1.2 Mission Statement ......................................................................................................................... 89
7.1.3 Objectives of the NCMA TG ............................................................................................................ 90
7.1.4 Strategic Initiatives and Implementation Plan .............................................................................. 90
7.2 Management Objectives ........................................................................................................................ 90
7.2.1 Share Groundwater Resources and Manage Pumping ................................................................ 91
7.2.2 Enhance Management of NCMA Groundwater ............................................................................. 92
7.2.3 Monitor Supply and Demand and Share Information .................................................................. 93
7.2.4 Manage Groundwater Levels and Prevent Seawater Intrusion ................................................... 96
7.2.5 Protect Groundwater Quality .......................................................................................................... 98
7.2.6 Manage Cooperatively .................................................................................................................... 99
7.2.7 Encourage Water Conservation ...................................................................................................100
7.2.8 Evaluate Alternative Sources of Supply ......................................................................................105
SECTION 8: References ........................................................................................................................................107
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Tables
Table 1. NCMA Technical Group Representatives ................................................................................................ 10
Table 2. Lopez Lake (SLOFCWCD Zone 3 Contractors) Water Entitlements (AFY) ............................................. 55
Table 3. Lopez Lake Municipal Diversion LRRP Reduction Strategy .................................................................. 56
Table 4. Lopez Lake Downstream Release LRRP Reduction Strategy ................................................................ 56
Table 5. Lopez Lake Deliveries, 2023 ................................................................................................................... 58
Table 6. NCMA SWP Table A Allocations, Drought Buffers, Stored Water and 2023 Deliveries ....................... 59
Table 7. NCMA Groundwater Entitlement and Production from Santa Maria River Valley
Groundwater Basin, 2023 ..................................................................................................................................... 62
Table 8. Baseline (Full Entitlement) Available Urban Water Supplies (AFY) ....................................................... 63
Table 9. Available Urban Water Supply, 2023 (AF) .............................................................................................. 64
Table 10. NCMA Crop Acreages and Calculated Evapotranspiration, 2023 ...................................................... 67
Table 11. Flow Terms Used in Root Zone Routing for IDC Model ....................................................................... 68
Table 12. IDC Model Results of Monthly Applied Water, 2023 ........................................................................... 72
Table 13. Estimated Rural Water Production, 2023 ............................................................................................ 73
Table 14. Historical Urban Water Production for Potable Use (Groundwater and Surface Water) ................... 74
Table 15. NCMA Groundwater Pumpage from Santa Maria River Valley Groundwater Basin, 2023 (AF) ....... 75
Table 16. Historical Total Water Use (Groundwater and Surface Water, AF) ..................................................... 77
Table 17. Water Production by Source, 2023 (AF) ............................................................................................... 81
Figures
Figure 1. Santa Maria River Valley Groundwater Basin ......................................................................................... 8
Figure 2. Northern Cities Management Area .......................................................................................................... 9
Figure 3. Locations of Monitoring Wells ................................................................................................................ 14
Figure 4. Depths of Monitoring Wells .................................................................................................................... 15
Figure 5. Annual Precipitation 1950 to 2023 ...................................................................................................... 20
Figure 6. Location of Precipitation Stations .......................................................................................................... 21
Figure 7. Monthly and Average Precipitation and Evapotranspiration ................................................................ 22
Figure 8. Groundwater Elevation Contours Spring 2023 ..................................................................................... 28
Figure 9. Groundwater Elevation Contours Fall 2023 ......................................................................................... 29
Figure 10. Selected Hydrographs .......................................................................................................................... 31
Figure 11. Sentry Well Hydrographs ...................................................................................................................... 32
Figure 12. Hydrograph of Deep Well Index Elevation ........................................................................................... 34
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Figure 13. Water Elevation, Conductivity, and Temperature, Well 24B03 ......................................................... 35
Figure 14. Water Elevation, Conductivity, and Temperature, Well 30F03 ......................................................... 36
Figure 15. Water Elevation, Conductivity, and Temperature, Well 30N02 ......................................................... 37
Figure 16. Water Elevation, Conductivity, and Temperature, Well 36L01 ......................................................... 38
Figure 17. Water Elevation, Conductivity, and Temperature, Well 36L02 ......................................................... 39
Figure 18. Water Elevation, Conductivity, and Temperature, Well 32C03 ......................................................... 40
Figure 19. Change in Groundwater Elevation, Deep Aquifer System, April 2022 to April 2023 ....................... 43
Figure 20. Change in Groundwater Elevation, Alluvial Aquifer, April 2022 to April 2023 ................................. 44
Figure 21. Chloride Concentrations in Monitoring Wells ..................................................................................... 46
Figure 22. Total Dissolved Solids Concentrations in Monitoring Wells ............................................................... 47
Figure 23. Piper Diagrams of Water Quality in Select Monitoring Wells
(4-page figure, one for each quarter) .................................................................................................................... 50
Figure 24. Locations of Municipal Production Wells ............................................................................................ 61
Figure 25. NCMA Agricultural Land 2023 ............................................................................................................. 66
Figure 26. 2023 Estimated Agricultural Water Demand and Monthly Precipitation
at the SLO No. 795 Gauge ..................................................................................................................................... 71
Figure 27. Municipal Water Use by Source ........................................................................................................... 76
Figure 28. Total Water Use (Urban, Rural, Agricultural) by Source ..................................................................... 78
Figure 29. Historical TDS, Chloride, and Sodium, Index Wells and 30N03 ........................................................ 85
Figure 30. Historical TDS, Chloride, and Sodium, Wells 30N02, MW-Blue and 36L01..................................... 86
Appendix
Appendix A NCMA Sentry Well Water Level and Water Quality Data
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Abbreviations and Acronyms
2005 Stipulation 2005 Stipulation for the Santa Maria River Valley Groundwater Basin Adjudication
2008 Judgement January 25, 2008 Judgment After Trial
2023 Annual Report Northern Cities Management Area 2023 Annual Monitoring Report
AF acre-feet
AFY acre-feet per year
Arroyo Grande City of Arroyo Grande
ATF advanced treatment facility
APW advanced purified water
basin Santa Maria River Valley Groundwater Basin
CIMIS California Irrigation Management Information System
County San Luis Obispo County
Court Superior Court of California, County of Santa Clara
CSA County Service Area
CUP Consumptive Use Program
DDW Division of Drinking Water
Delta Sacramento-San Joaquin Delta
DRI Desert Research Institute
DWR California Department of Water Resources
ET evapotranspiration
Grover Beach City of Grover Beach
IDC 2015 Integrated Water Flow Model Demand Calculator
ILRP Irrigated Lands Regulatory Program
IRWMP Integrated Regional Water Management Plan
IWFM 2015 Integrated Water Flow Model
LRRP Low Reservoir Response Plan
MLLW mean lower low water
MSL mean sea level
NAVD 88 North American Vertical Datum of 1988
NCMA Monitoring
Program
Monitoring Program for the Northern Cities Management Area
NCMA Northern Cities Management Area
NCSD Nipomo Community Services District
Nipomo station Nipomo Station (No. 202)
NMMA Nipomo Mesa Management Area
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NWP Nacimiento Water Project
OCSD Oceano Community Services District
PG&E Pacific Gas & Electric
Pismo Beach City of Pismo Beach
RWFPS Recycled Water Facility Planning Study
SGMA Sustainable Groundwater Management Act
SLOFCWCD County of San Luis Obispo Flood Control and Water Conservation District
SMGBMA Santa Maria Groundwater Basin Management Area
SMRVGB Santa Maria River Valley Groundwater Basin
SMVMA Santa Maria Valley Management Area
SNMP Salt and Nutrient Management Plan
SSLOCSD South San Luis Obispo County Sanitation District
Strategic Plan NCMA Strategic Plan
SWP California State Water Project
TAC Technical Advisory Committee
TAW total available water
TDS total dissolved solids
TG NCMA Technical Group
UWMP Urban Water Management Plan
WRAC Water Resources Advisory Committee
WSC Water Systems Consulting, Inc.
WSCP Water Shortage Contingency Plan
WSPDP Water Supply, Production, and Delivery Plan
WWTP wastewater treatment plant
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Executive Summary
The 2023 Annual Monitoring Report for the Northern Cities Management Area (NCMA) (Annual Report) is
prepared pursuant to the requirements of the 2005 Stipulation for the Santa Maria River Valley Groundwater
Basin Adjudication (2005 Stipulation) and the January 25, 2008, Judgment After Trial (2008 Judgment). This
2023 Annual Report provides an assessment of hydrologic conditions for the NCMA based on data collected
during the calendar year of record. As specified in the Judgment, the NCMA agencies, consisting of the Cities
of Arroyo Grande, Grover Beach, and Pismo Beach, and the Oceano Community Services District (OCSD),
regularly monitor groundwater in the NCMA and analyze other data pertinent to water supply and demand,
including the following:
Land and water use in the Santa Maria River Valley Groundwater Basin (SMRVGB or basin)
Sources of supply to meet water demand
Groundwater conditions (including water levels and water quality)
Amount and disposition of NCMA water supplies that are not groundwater
Results of the data compilation and analysis for calendar year 2023 are documented and discussed in this
2023 Annual Report.
Groundwater Conditions
During 2023, water elevations generally increased in the NCMA portion of the SMRVGB in response to above-
average rainfall received during the 2022/2023 winter season. The rise in water level is not only a direct result
of above-average precipitation, but is also attributed to ongoing efforts by all NCMA agencies to minimize
groundwater extraction and maximize surface water supply sources while maintaining the water conservation
practices and requirements implemented during the recent drought.
Groundwater Levels
The greatest threat to the groundwater supply in the area is seawater intrusion. An indicator of whether the
NCMA agencies and other stakeholders are successfully averting the threat of seawater intrusion is the
groundwater elevation in the NCMA sentry wells near the coastline. The average water elevations of three
sentry wells—24B03, 30F03, and 30N02—make up a Deep Well Index. This index was developed by the NCMA
in 2007 to gauge the ability of the aquifer to withhold potential landward migration of seawater. A Deep Well
Index value above 7.5 feet North American Vertical Datum 1988 (NAVD 88)1 generally indicates that sufficient
freshwater flow occurs from the east to the coastline to prevent seawater intrusion. History has shown that a
prolonged period in which the Deep Well Index level is below 7.5 feet develops groundwater conditions that
pose a risk of seawater intrusion. The following are evaluations of groundwater levels through the seasons in
calendar year 2023:
Spring 2023. In the mostly urbanized areas north of Arroyo Grande Creek, groundwater is extracted from
the deep groundwater aquifers of the Paso Robles Formation and the Careaga Sand. The water elevation
contours in the deep aquifer system in spring of 2023 generally showed a westerly to southwesterly
groundwater flow (see Figure 8, on page 28, below). These groundwater flow gradients and positive (above
1 Note that 0.0 NAVD 88 is 2.72 feet lower than mean sea level (MSL) and is 0.08 feet above the mean lower low water
(MLLW) (which can be thought of as the average height of the lowest tides), as recorded at the Port San Luis tide station
datum (https://tidesandcurrents.noaa.gov/datums.html?id=9412110).
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0.0 NAVD 88) groundwater elevations are developed and maintained primarily because the NCMA
agencies have managed this portion of the basin through cooperative water management and
conservation efforts. The proactive management of the basin and collaborative efforts by the agencies
was necessary to respond to lower water levels in the Deep Well Index more than a decade ago. The
combined NCMA efforts are to ensure that fresh groundwater flow to the ocean continues to create a
barrier to seawater intrusion. April 2023 groundwater elevations in the deep aquifer system main
production zone along the coast ranged from 7.5 to 13.5 feet above 0.0 NAVD 88. In the southernmost
portion of the area, the groundwater elevations, flow, and gradient are less well known because there are
only a limited number of wells and point sources of water level data. The groundwater gradient and flow
in this area are generally inferred on the basis of historical records and trends as well as water level data
from the Nipomo Mesa Management Area (NMMA) farther east.
Cienega Valley. The Cienega Valley is in the central area of the NCMA, generally south of Arroyo Grande
Creek. All known groundwater pumping in this area is from the relatively shallow (less than 100 feet deep)
alluvial aquifer. Agricultural groundwater production typically results in seasonal drawdown of the alluvial
aquifer in the valley. Historically, a portion of the recharge to the alluvial aquifer of the Cienega Valley came
from the Paso Robles Formation aquifer on the Nipomo Mesa. However, this recharge mechanism appears
to be slowing because of declining water levels on the Nipomo Mesa (see Section 2.5, below). This
reduction of subsurface inflow exacerbates the seasonal drawdown of the alluvial aquifer in the Cienega
Valley. Groundwater elevations in the alluvial aquifer in the Cienega Valley were in the range of 5 feet to
more than 50 feet above 0.0 NAVD 88 in spring 2023. These data show an overall increase in alluvial
groundwater elevations from April 2022 to April 2023.
Fall 2023. Groundwater level contours for October 2023 are presented in Figure 9, on page 29, below.
Groundwater elevations in the alluvial aquifer within the Cienega Valley in October 2023 were 2 to 12 feet
lower than elevations at the start of the irrigation season in April 2023, which is a typical seasonal
response to the irrigation season. No discernable pumping depression was observed in the Cienega Valley
in 2023. October 2023 groundwater elevations in the deep aquifer system main production zone along
the coast ranged from 8.2 to 12.5 feet above 0.0 NAVD 88.
Deep Wells. In 2023, the Deep Well Index started the year above the trigger value with an index value of
more than 9 feet in January. The index value continued to climb through early April, peaking over 12 feet,
and then generally declined through early September, reaching a low point just over 10 feet. Since early
September, the index value has increased steadily, finishing the year at about 12 feet NAVD 88.
NCMA/NMMA Boundary. The water elevation in the San Luis Obispo County monitoring well (Well 32C03),
which was installed to monitor aquifer conditions along the NCMA/NMMA boundary, typically exhibits
regular seasonal fluctuations. In 2023, well 32C03 recovered to levels well above 0.0 NAVD 88, with a
seasonal low value of more than 6 feet NAVD 88 in September. This is a turnaround from the below 0.0
NAVD 88 seasonal low levels experienced in 2021 and 2022. The 2023 seasonal high water level in well
32C03 is the highest seen since early 2017.
Change in Groundwater in Storage
The change in groundwater in storage in the NCMA portion of the SMRVGB between April 2022 and April 2023
is estimated by comparing water level contour maps created for these periods and calculating the volume
change from April 2022 to April 2023. Separate estimates of change in groundwater in storage were computed
for both the deep aquifer system and for the alluvial aquifer and then summed to represent the total NCMA
estimated change in groundwater in storage. Comparison of April water levels was chosen to comply with the
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California Department of Water Resources (DWR) reporting requirements under the Sustainable Groundwater
Management Act (SGMA).2
An increase of groundwater in storage reflects a net increase in water levels across the aquifer. During the
period of April 2022 to April 2023, the NCMA portion of the SMRVGB experienced a net increase of
groundwater in storage. The net increase in groundwater levels represented an increase of groundwater in
storage from April 2022 to April 2023 of approximately 3,610 acre-feet (AF); that is, there was approximately
3,610 AF more groundwater stored in the NCMA portion of the SMRVGB in April 2023 than in April 2022. This
is the largest single-year increase in groundwater in storage observed since tracking of this attribute began in
2016. This significant increase in groundwater in storage may be largely attributable to groundwater recharge
from prolonged infiltration from Arroyo Grande Creek during the Lopez Lake spill event which extended from
March through June 2023.
Groundwater Quality
Analytical results of key water quality data (chloride, total dissolved solids [TDS], and sodium) in 2023 were
generally consistent with historical concentrations and observed ranges of constituent concentrations. In
general, no water quality results were observed that are a cause of concern.
None of the water quality results from monitoring events throughout 2023 indicate an incipient episode or
immediate threat of seawater intrusion. Water quality degradation through incipient seawater intrusion
occurred in 2009 with measured elevated concentrations of TDS, sodium, and chloride in wells 30N02,
30N03, and MW-Blue, all of which are screened in the Paso Robles Formation. No indications of seawater
intrusion have been observed in wells screened in the underlying Careaga Sand. The exact location of the
seawater-freshwater interface is currently unknown; however, the airborne electromagnetic survey conducted
in 2020 (Ramboll, 2022) indicates that no seawater intrusion was occurring in the deep aquifer system at the
time of the survey.
Water Supply and Production/Deliveries
Total water use in the NCMA in 2023 (including urban use by the NCMA agencies plus agricultural irrigation
and private pumping by rural water users) was 7,403 AF. Of this amount, Lopez Lake deliveries were
3,493 AF, California State Water Project deliveries totaled 1,213 AF, and groundwater pumping from the
NCMA portion of the SMRVGB accounted for approximately 2,697 AF. The City of Arroyo Grande produced
0 AF from its Pismo Formation wells, outside the SMRVGB, in 2023. The breakdown is shown in
Table ES- 1, below.
Urban water use in 2023 among the NCMA agencies was 5,240 AF, a decrease from 2022 and the lowest
usage in at least the last 25 years. Urban water use in the past 18 years has ranged from 5,240 AF (2023)
to 8,982 AF (2007). There has been an overall decline in urban production since 2007, although there
have been slight increases since the low point in 2016. The decline in pumpage since 2013 was in direct
response to a statewide order by the governor to reduce the amount of water used in urban areas by
20 percent. That goal was achieved locally by conservation activities implemented by the NCMA agencies,
and the relatively low urban water use has been maintained since then.
2 On September 16, 2014, Governor Jerry Brown signed into law a three-bill legislative package, composed of Assembly Bill
1739 (Dickinson), Senate Bill (SB) 1168 (Pavley), and SB 1319 (Pavley), collectively known as the Sustainable Groundwater
Management Act (SGMA).
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Agricultural acreage in the NCMA portion of the SMRVGB has remained relatively constant for more than
20 years. Thus, the annual applied water requirement for agricultural irrigation has been relatively stable,
although it varies with weather conditions. Acknowledging the variability resulting from weather conditions,
agricultural applied water is not expected to change significantly given the relative stability of applied
irrigation acreage and cropping patterns in the NCMA. Changes in rural domestic pumping have not been
significant.
Table ES- 1. Water Production by Source (AF), 2023
Agency Lopez Lake
State
Water
Project
SMRVGB
Groundwater
Other
Supplies1 Total
Urban Area
Arroyo Grande 1,867 0 69 0 1,936
Grover Beach 793 0 373 0 1,166
Pismo Beach 433 1,037 39 0 1,509
OCSD 400 176 53 0 629
Urban Water Use Total 3,493 1,213 534 0 5,240
Non-Urban Area
Agricultural Irrigation
Applied Water 0 0 2,045 0 2,045
Rural Water Users 0 0 80 0 80
Non-potable Applied
Irrigation Water (Arroyo
Grande)
0 0 38 0 38
Total 3,493 1,213 2,697 0 7,403
Notes
1 The category “Other Supplies” includes groundwater pumped from outside the NCMA boundaries.
AF = acre-feet NCMA = Northern Cities Management Area OCSD = Oceano Community Services District
SMRVGB = Santa Maria River Valley Groundwater Basin
Threats to Water Supply
Total groundwater pumping (urban, agriculture, and rural domestic) from the SMRVGB in the NCMA was
2,697 AF in 2023, which is 28 percent of the court-accepted3 9,500 acre-feet per year (AFY) long-term
safe yield of the NCMA portion of the SMRVGB.
When pumping is less than the safe yield of an aquifer, groundwater in storage should generally increase
and result in rising groundwater levels. As such, groundwater elevations throughout the NCMA portion of
the SMRVGB should rise significantly if several consecutive years of groundwater pumping occurs at 30 to
3 The calculated, consensus safe yield value of 9,500 AFY for the NCMA portion of the SMRVGB was formalized in the 2002
Settlement Agreement through affirmation of the 2002 Groundwater Management Agreement among the NCMA agencies,
which is described in more detail in Section 1.1, below, of this report.
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40 percent of the safe yield, which has been the case in the NCMA for the past decade. However, data
from the past decade show that the aquifer is still in a tenuous position with respect to the threat of
seawater intrusion. According to the DWR Bulletin 63-3 report, both the Paso Robles Formation aquifer
and the lower confined portion of the Cienega Valley alluvial aquifer are recharged primarily from
subsurface groundwater inflow from the east, where the overlying confining layers are thin to non-existent
(DWR, 1970). These recharge areas to the east include inland reaches of Arroyo Grande Valley and
portions of Nipomo Mesa (DWR, 1970). Any increase in regional pumping, or any other changes that
reduce recharge from the east will leave the NCMA with a serious groundwater deficit that threatens
seawater intrusion.
Historically, groundwater flowed from higher elevations inland westward towards the ocean, thereby acting
to prevent seawater intrusion. As first recognized in 2008–2009, a well-documented pumping depression 4
in the deep aquifer system near Black Lake Canyon within the NMMA appears to have reversed the
groundwater gradient. The development of a landward gradient in the southern portion of the NCMA,
caused by the pumping depression in the NMMA, likely reduces the historical recharge volume of
subsurface inflow into the NCMA from Nipomo Mesa. This reduction of subsurface inflow to the NCMA
creates conditions more likely to result in seawater intrusion in the NCMA and NMMA and it exacerbates
the seasonal drawdown of the alluvial aquifer in the Cienega Valley.
During 2023, there were no indications of seawater intrusion.
4 As documented in NMMA annual reports, available at https://ncsd.ca.gov/resources/reports-by-subject. (Accessed January
30, 2024.)
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SECTION 1: Introduction
This Northern Cities Management Area 2023 Annual Monitoring Report (2023 Annual Report or Annual
Report) summarizes hydrologic conditions for calendar year 2023 in the Northern Cities Management Area
(NCMA) of the Santa Maria River Valley Groundwater Basin (SMRVGB or the basin) in San Luis Obispo County
(County), California (Figure 1, on page 8, below). This report was prepared on behalf of four public agencies
collectively referred to as the Northern Cities, which include the Cities of Arroyo Grande (Arroyo Grande), Grover
Beach (Grover Beach), and Pismo Beach (Pismo Beach), and the Oceano Community Services District
(OCSD)5,6 (Figure 2, on page 9, below). These agencies, along with local landowners, the County, and the
County of San Luis Obispo Flood Control and Water Conservation District (SLOFCWCD) have managed local
surface water and groundwater resources since the late 1970s to preserve the long-term integrity of water
supplies.
1.1 History of Litigation
The rights to pump groundwater from the SMRVGB have been in litigation (adjudication) since the late 1990s.
The physical solution set forth in the 2005 Stipulation for the Santa Maria River Valley Groundwater Basin
Adjudication (2005 Stipulation) and the January 25, 2008, Judgment After Trial (2008 Judgment)7 established
requirements and goals for the management of the entire SMRVGB. The Superior Court of California, County
of Santa Clara (Court) established three separate management areas, including the NCMA, the Nipomo Mesa
Management Area (NMMA), and the Santa Maria Valley Management Area (SMVMA). The Court mandated that
each management area form a technical group to monitor the groundwater conditions of its area, to
continuously assess the hydrologic conditions of each area, and to prepare an annual report each year to
provide the Court with a summary of the previous year’s conditions, actions, and threats.
The requirements for the annual report, as directed by the Court in the 2005 Stipulation (June 30, 2005,
version, paragraph IV.D.3), are as follows:
Within one hundred and twenty days after each Year end, the Management Area Engineers
will file an Annual Report with the Court. The Annual Report will summarize the results of the
Monitoring Program, changes in groundwater supplies, and any threats to Groundwater
supplies. The Annual Report shall also include a tabulation of Management Area water use,
including Imported Water availability and use, Return Flow entitlement and use, other
Developed Water availability and use, and Groundwater use. Any Stipulating Party may object
to the Monitoring Program, the reported results, or the Annual Report by motion.
This 2023 Annual Report satisfies the requirements of the Court. The annual report for each calendar year
(January 1 to December 31) is submitted to the Court by April 30 of the following calendar year, pursuant to
the 2005 Stipulation. As a result of legislation passed by the State of California related to the Sustainable
Groundwater Management Act (SGMA) that requires submittal of annual reports and supporting information
and data for each adjudicated groundwater basin by April 1 of each year, the 2023 Annual Report is also
published to the California Department of Water Resources (DWR) adjudicated basin reporting website.8
5 Each agency may also be individually referred to as an NCMA agency.
6 Portions of Arroyo Grande and Pismo Beach extend outside the NCMA.
7 Santa Maria Valley Water Conservation District v. City of Santa Maria, et al., Case #1-97-CV-770214 Filing #G-79046. (Cal.,
2015).
8 The link to the reporting system is available on this DWR page: https://water.ca.gov/Programs/Groundwater-
Management/SGMA-Groundwater-Management/Adjudicated-Areas.
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SantaMariaGuadalupe
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Date: January 28, 2020 Data Sources:
LEGENDNorthern Cities Management AreaNipomo Mesa Management AreaSanta Maria Valley Management AreaSanta Maria River Valley Groundwater BasinCounty Borders
Santa Maria River Valley Groundwater Basin
FIGURE 1
Northern Cities Management AreaSan Luis Obispo County, California
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Date: February 26, 2020 Data Sources: DWR, NCMA, USGS, California Geological Survey, ESRI
LEGENDNorthern Cities Management AreaNipomo Mesa Management AreaSanta Maria River Valley Groundwater BasinFaults (dashed where inferred)Streams
Northern Cities Management Area
FIGURE 2
San Luis Obispo County, California
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The collaborative water supply management approach of the NCMA agencies was recognized by the Court in
the 2002 Groundwater Management Agreement (which was based on the 1983 Gentlemen’s Agreement),
formalized in the Settlement Agreement Between Northern Cities, Northern Cities Landowners, and Other
Parties (2002 Settlement Agreement or Settlement Agreement) and incorporated in the 2005 Stipulation. On
June 30, 2005, the 2005 Stipulation, which included the 2002 Settlement Agreement, was agreed upon by
numerous parties, including the NCMA agencies. The approach was then adopted by the Court in its 2008
Judgment. Although appeals to that decision were filed, a subsequent decision by the Sixth Appellate District
(filed November 21, 2012) upheld the Judgment. On February 13, 2013, the Supreme Court of California
denied a petition to review the decision.
Pursuant to the Court’s continuing jurisdiction, Arroyo Grande, Pismo Beach, and Grover Beach filed a motion
on September 29, 2015, requesting that the Court impose moratoriums on certain water extraction and use
by stipulating parties within the NMMA. Judge Kirwan denied the motion without prejudice. He did, however,
order the parties to meet and confer to address the issues raised in the motion. The meet and confer process
continued throughout 2023 through continuation of the case management conference process. A motion to
appoint a technical advisor to the Court occurred in 2021, which resulted in Court selection of a technical
advisor. The order by the Court precipitated a series of meetings and collaborative actions between the NCMA
and NMMA agencies, including the tentative formation of a Seawater Intrusion Working Group (now inactive)
to discuss the threat and potential solutions for possible seawater intrusion.
1.2 Description of the NCMA Technical Group
Pursuant to a requirement in the 2005 Stipulation, the NCMA Technical Group (TG) was formed (Paragraph
IV.C and Paragraph VII). The TG is composed of representatives of each of the NCMA agencies, as listed in
Table 1, below.
Table 1. NCMA Technical Group Representatives
Agency Representative
City of Arroyo Grande
Bill Robeson
Public Works Director/Assistant City Manager
Shane Taylor
Utilities Manager
City of Grover Beach
Gregory A. Ray, PE
Director of Public Works/City Engineer
R.J. (Jim) Garing, PE
Consulting City Engineer for Water and Sewer
City of Pismo Beach Benjamin A. Fine, PE
Director of Public Works/City Engineer
Oceano Community Services
District
Will Clemens
General Manager
Tony Marracino
Utility Manager
Notes
NCMA = Northern Cities Management Area PE = Professional Engineer
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The NCMA TG contracts with Water Systems Consulting, Inc. (WSC), to serve as staff extension to assist the
TG in its roles and responsibilities in managing the water supply resources. The TG also contracts with GSI
Water Solutions, Inc., and its subconsulting partner, GEI Consultants, Inc., to conduct the quarterly
groundwater monitoring and sampling tasks, evaluate water demand and available supply, identify threats to
water supply, and assist the TG in preparation of the annual report.
1.3 NCMA Technical Group Mission Statement
The NCMA TG developed the following mission statement to help guide ongoing initiatives and to capture the
requirements outlined in the 2002 Groundwater Management Agreement, 2002 Settlement Agreement, 2005
Stipulation, and 2008 Judgment:
Preserve and enhance the sustainability of water supplies for the Northern Cities Area by:
Enhancing supply reliability
Protecting water quality
Maintaining cost-effective water supplies
Advancing the legacy of cooperative water resources management
Promoting conjunctive use
1.4 Coordination with Management Areas
Since 1983, management of the NCMA has been based on cooperative efforts of the four NCMA agencies in
continuing collaboration with the County, SLOFCWCD, and other local and state agencies. Specifically, the
NCMA agencies have jointly monitored and managed their groundwater production and, in cooperation with
the SLOFCWCD, invested in surface water supplies to reduce dependence on groundwater pumping and
protect the groundwater resource. The NCMA TG hosts a meeting each year with agricultural representatives
from throughout the NCMA to discuss the status of the basin, present the findings of the annual report, and
develop collaborative strategies for protecting the groundwater resource. In addition to the efforts discussed
in this 2023 Annual Report, cooperative management occurs through many means, including communication
by the NCMA agencies in their respective public meetings, participation in the SLOFCWCD Zone 3 9 Advisory
Committee (related to the management and operation of Lopez Lake, which is described further in
Section 4.1.1, below), and participation in the Water Resources Advisory Committee (WRAC) (the County-wide
advisory panel on water issues). The NCMA agencies are active participants in current and ongoing integrated
regional water management efforts and participated in preparation and adoption of the 2019 update of the
San Luis Obispo County Integrated Regional Water Management Plan (IRWMP). The IRWMP promotes
integrated regional water management to ensure sustainable water uses, reliable water supplies, better water
quality, environmental stewardship, efficient urban development, protection of agriculture, and a strong
economy.
Since the 2008 Judgment, the NCMA TG has taken the lead in cooperative management of its management
area. The NCMA TG has met monthly (at a minimum) for many years and continued to do so throughout 2023.
The TG also participates in the Santa Maria Groundwater Basin Management Area (SMGBMA) technical
subcommittee, formed in 2009; however, no meetings of the SMGBMA were held in 2023. The purpose of the
9 Flood Control Zone 3 (Lopez Project) is operated by SLOFCWCD to operate Lopez Reservoir for municipal and agricultural
water supplies. It was established to operate the Lopez water supply system and is a wholesale supplier. The contractors in
Zone 3 include the communities of Oceano, Grover Beach, Pismo Beach, Arroyo Grande, and County Service Area 12
(including the Avila Beach area).
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SMGBMA technical subcommittee is to coordinate efforts among the three management areas (NCMA, NMMA,
SMVMA) such as sharing data throughout the year and during preparation of the annual report, reviewing and
commenting on technical work efforts of other management areas, standardizing monitoring protocols,
considering projects and grant opportunities of joint interest and benefit, and sharing information and data
among the managers of the three management areas.
The outcomes of the motion that Arroyo Grande, Pismo Beach, and Grover Beach filed on September 29, 2015
(see Section 1.1, above), include increased discussion and collaboration between the NCMA and NMMA. One
of the initiatives was the formation of an NCMA-NMMA Management Coordination Committee that has met
several times since 2018 to discuss items of mutual concern and develop strategies for addressing the
concerns. Another area of increased mutual collaboration between the NCMA and NMMA was the formation
in 2016 of a technical team to collaboratively develop a single data set of water level data points as part of
preparing a consistent set of semiannual water level contour maps for the NCMA and NMMA. Those efforts
continued into and throughout 2023 and resulted in the development of consistent water level contouring
(and enhanced understanding of groundwater conditions) throughout the NCMA and NMMA.
1.5 Development of Monitoring Program
The 2008 Judgment orders the stipulating parties to comply with all terms of the 2005 Stipulation. As specified
in the Judgment and as outlined in the Monitoring Program for the Northern Cities Management Area (Todd,
2008) (NCMA Monitoring Program), the NCMA agencies are to conduct groundwater monitoring of wells in the
NCMA. In accordance with requirements of the Judgment, the NCMA agencies collect and analyze data
pertinent to water supply and demand, including the following:
Land and water use in the NCMA portion of the SMRVGB
Sources of supply to meet those uses
Groundwater conditions (including water levels and water quality)
Amount and disposition of other sources of water supply in the NCMA
The NCMA Monitoring Program requires that the NCMA agencies gather and compile pertinent information on
a calendar-year basis; this is accomplished through data collected by NCMA agencies (including necessary
field work), the SLOFCWCD, and by other public agencies. Periodic reports, such as Urban Water Management
Plans (UWMPs) prepared by Arroyo Grande, Grover Beach, and Pismo Beach, provide information about
demand, supply, and water supply facilities. Annual data are added to the comprehensive NCMA database
and analyzed. Results of the data compilation and analysis for 2023 are documented and discussed in this
2023 Annual Report.
As shown in Figure 1, on page 8, above, the NCMA represents the northernmost portion of the SMRVGB as
defined in the 2005 Stipulation. Adjoining the NCMA to the south and east is the NMMA; the SMVMA
encompasses the remainder of the SMRVGB. Figure 2, on page 9, above, shows the locations of the four
NCMA agencies in the NCMA.
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1.6 Groundwater Monitoring Network
The NCMA Monitoring Program includes (1) compilation of groundwater elevation data from the County, (2)
water quality and groundwater elevation monitoring data from the network of sentry and monitoring wells in
the NCMA, and (3) groundwater elevation data from municipal pumping wells. Analysis of these data is
summarized below in accordance with the NCMA Monitoring Program (Todd, 2008) and as modified as
additional well data and data sources have become available over the years.
Approximately 150 wells within the NCMA were monitored for water levels by the County at some time during
the past few decades. The County currently monitors the water level in 50 wells within the NCMA on a
semiannual basis in April and October. The County monitoring program includes four sentry well clusters
(piezometers) along the coast, a four-well cluster in Oceano, and County Monitoring Well No. 3 (12N/35W-
32C03) (County Monitoring Well No. 3 [32C03]) located on the eastern NCMA boundary between the NCMA
and NMMA (Figure 3, on page 14, below). The County monitors more than 125 additional wells in the NMMA
portion of the SMRVGB within the County. Beginning in 2009, the NCMA agencies initiated a quarterly sentry
well monitoring program to supplement the County’s semiannual schedule.
To monitor overall changes in groundwater conditions, representative wells within the NCMA were selected for
preparation of hydrographs and evaluation of water level changes. Wells were selected based on the following
criteria:
The wells must be part of the County’s current monitoring program or part of a public agency’s regular
monitoring program.
Detailed location information must be available.
Construction details of the wells must be available.
The locations of the wells should have a wide geographic distribution.
The historical record of water level data must be long and relatively complete.
Many of the wells that have been used in the program are production wells that were not designed for
monitoring purposes (i.e., the wells are screened across various production zones). Moreover, many of the
wells are active production wells or are located near active wells and are therefore potentially subject to
localized pumping effects that result in measurements that are lower than the regionally representative water
level. These effects are not always apparent at the time of measurement and data cannot easily be identified
as representing static groundwater levels in specific zones (e.g., unconfined or deep confined to semi-
confined). Therefore, data should be considered as a whole in developing a general representation of
groundwater conditions.
The “sentry” wells (32S/12E-24Bxx, 32S/13E-30Fxx, 32S/13E-30Nxx, and 12N/36W-36Lxx) are a critical
element of the groundwater monitoring network and are designed to provide an early warning system to
identify potential seawater intrusion in the aquifer (Figure 3, on page 14, below). Each sentry well consists of
a cluster of multiple wells that allows for the measurement of groundwater elevation and quality from discrete
depths. Also shown in Figure 3, on page 14, below is the OCSD observation well cluster, a dedicated monitoring
well cluster located just seaward of OCSD production well 810, and County Monitoring Well No. 3 (32C03).
Figure 4, on page 15, below, shows the depth and well names of the sentry well clusters, the OCSD observation
well cluster, and County Monitoring Well No. 3 (32C03).
10 MW-Yellow, the deepest completion in the OCSD well cluster has been removed from the NCMA Monitoring Program as a
result of apparent casing failure. See Section 3.1.3, below, for more details.
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LEGEND
!>NCMA Monitoring WellsNorthern Cities Management Area Faults (dashed where inferred)Streams
Locations of Monitoring Wells
FIGURE 3
Northern Cities Management AreaSan Luis Obispo County, California
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FIGURE 4. DEPTHS OF MONITORING WELLS
Northern Cities Management Area
San Luis Obispo County, California
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OCSD MW-Yellow has been removed from the NCMA
monitoring program due to apparent casing failure.
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Traditionally, the wells were divided into three basic depth categories—shallow, intermediate, and deep—to
describe the relative depths of each monitoring well within the cluster. The basic depth categories do not
necessarily describe the geologic unit and relative depth of the unit that the screened portion of the well
monitors. It is important, however, to recognize and identify the geologic unit that each well monitors. The
water level responses and water quality changes are quite different in wells that monitor the shallow alluvial
unit (24B01, 30F01, and 30N01), the Paso Robles Formation (24B02, 30F02, 30N02, 30N03, 36L01, OCSD
MW-Green, OCSD MW-Blue, and 32C03), and the deeper Careaga Sand (24B03, 30F03, 36L02, OCSD
MW-Silver, and OCSD MW-Yellow 11). The significance of this level of differentiation will be studied more
extensively in the future.
Since the sentry well monitoring program began in 2009, 60 monitoring events have been conducted. These
monitoring events include collection of synoptic groundwater elevation data and water quality samples for
laboratory analysis.
1.7 Recent and Ongoing Strategic Initiatives
1.7.1 Strategic Plan
An NCMA Strategic Plan (Strategic Plan) was first developed in 2014 to provide the NCMA TG with a mission
statement to guide future initiatives, provide a framework for identifying and communicating water resource
planning goals and objectives, and formalize a 10-year work plan for implementation of those efforts (WSC,
2014). Several key objectives were identified related to enhancing water supply reliability, improving water
resource management, and increasing effective public outreach. Implementation of these efforts continued
throughout 2023.
Work began in 2019 to update the 2014 Strategic Plan, which was developed over a series of strategic
planning sessions and NCMA TG meetings and culminated with the publication of the Strategic Plan for the
NCMA TG in March 2020.
Several key strategies were identified by the TG for improving the sustainability of the water resource. Strategic
initiatives were then developed for each key strategy. The TG then developed an implementation plan for the
key strategies that includes current, short-term, and long-term time frames for initiatives that could be
completed within 1 year, 5 years, and more than 5 years.
A more detailed description of the Strategic Plan is provided in Section 7.1, below.
1.7.2 Central Coast Blue
Central Coast Blue is a regional recycled water project with partner agencies consisting of Arroyo Grande,
Grover Beach and Pismo Beach, with Pismo Beach serving as the lead agency. The OCSD and South San Luis
Obispo County Sanitation District (SSLOCSD) are currently not members of the joint powers authority, however
both agencies have expressed support of the project and are key stakeholders in this regional project. The
project, currently in the final design and permitting phase, will develop a sustainable, drought resilient water
supply and help protect the SMRVGB. The project is envisioned in two Phases, with Phase 1 treating effluent
from the Pismo Beach wastewater treatment plant (WWTP) and Phase 2 adding effluent from the SSLOCSD
WWTP.
11 Note that OCSD MW-Yellow was removed from the monitoring program in the second quarter of 2022 (see details in
Section 3.3.1, below).
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After undergoing a three-stage advanced treatment process of microfiltration, reverse osmosis, and ultraviolet
disinfection with advanced oxidation, the purified water will be sent through conveyance pipelines to injection
wells and injected into the SMRVGB. The project will also include a network of monitoring wells to monitor the
effects of the project, ensure regulatory compliance, and safeguard water quality in the basin. The injection of
up to 900 acre-feet per year (AFY) in Phase 1 and up to 3,500 AFY in Phase 2 will reduce the risk of seawater
intrusion and improve water supply sustainability and reliability for the region. Currently, the effluent from both
wastewater treatment plants is being discharged to the ocean. Central Coast Blue will provide an opportunity
to capture this lost water resource and use it to recharge the SMRVGB to create a drought-resilient, sustainable
water supply for the community by not only increasing the volume accessible in the aquifer but by also creating
a barrier to prevent landward migration of seawater.
Tasks related to the development of the project that were performed before 2023 included preliminary design,
pilot plant operation and data collection, test injection and monitoring well construction, supplemental
geophysics investigation, groundwater modeling, environmental review, and the beginning stages of final
design and permitting. Major project milestones that occurred in 2023 included progression of the final design,
adoption of an Environmental Impact Report Addendum, development of grant and low-interest loan
applications, notice of award of an additional project grant funding, startup of the Central Coast Blue Regional
Recycled Water Authority, and dozens of presentations given to the community to provide information about
the project.
1.7.3 Phase 1 Groundwater Model
As part of Central Coast Blue planning and technical studies, a localized groundwater flow model (the Phase
1A model) was developed for the northern portion of the NCMA. The Phase 1A model evaluated the concept
of injecting advanced purified water (APW) into the SMRVGB to increase aquifer recharge, improve water
supply reliability, and help prevent future occurrences of seawater intrusion (CHG, 2017). Based on the results
of the Phase 1A model and through funding by the SSLOCSD Supplemental Environmental Program, work was
initiated in 2017 and continued through 2020 for development of the Phase 1B groundwater flow model
(Geoscience Support Services, 2019). The domain of the Phase 1B model covers the entire NCMA, NMMA,
and the portion of the SMVMA north of the Santa Maria River.
The purpose of the Phase 1B model was to expand the Phase 1A model and use the expanded model to
evaluate a series of groundwater injection and extraction scenarios to further support Central Coast Blue. The
Phase 1B model has been used to (1) more completely understand the groundwater conditions of the NCMA
portion of the SMRVGB, (2) understand the groundwater flow dynamics and components of the groundwater
water balance of the aquifer, (3) identify the locations of the proposed injection wells, (4) quantify the amount
of water that can be injected, (5) evaluate strategies for preventing seawater intrusion, and (6) develop
estimates of the overall yield that the Central Coast Blue stakeholders will be able to receive from the project.
The Phase 1C Groundwater Model, developed in 2021 (Geoscience Support Services, 2021), continues to be
utilized to identify optimal locations of the proposed injection and monitoring wells, quantify the amount of
water that can be injected, evaluate strategies for preventing seawater intrusion, and develop estimates of
the overall yield that the Central Coast Blue stakeholders will be able to receive from the project. The Phase 1C
model will also be a tool for the NCMA agencies to further evaluate basin yield and basin management
initiatives.
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1.7.4 Update of the 2002 Groundwater Management Agreement
Throughout 2022, the TG discussed various components and approaches to updating the 2002 Groundwater
Management Agreement. A draft Groundwater Management Agreement update was produced in 2023 but
has not been finalized pending completion of a companion Adaptive Management Agreement. Work on the
Adaptive Management Agreement and finalization of the updated Groundwater Management Agreement will
continue in 2024.
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SECTION 2: Basin Setting
2.1 Setting
The Tri-Cities Mesa 12 in the northern portion of the NCMA is predominantly urban (residential/commercial).
The Cienega Valley, a low-lying coastal stream and valley regime, is the area south of Arroyo Grande Creek in
the central part of the area and is predominantly agricultural. The southern and southwestern portions of the
area are composed of beach dunes and small lakes primarily managed by California Department of Parks and
Recreation as a recreational area and a sensitive species habitat.
2.2 Precipitation
Each year, climatological and hydrologic (stream flow) data for the NCMA are added to the NCMA database.
Annual precipitation from 1950 to 2023 is presented in Figure 5, on page 20, below.
Historical rainfall data are compiled on a monthly basis for the following two stations:13
DWR California Irrigation Management Information System (CIMIS) Nipomo Station (No. 202) (Nipomo
station) for 2006 to present
San Luis Obispo County-operated rain gauge (No. SLO 795) in Oceano for 2000 to present
The locations of the two stations are shown in Figure 6, on page 21, below. In recent years, it was noted that
the CIMIS Nipomo station may have been recording irrigation overspray as precipitation and the precipitation
data from the station may not be reliable. However, the evapotranspiration data are still considered reliable.
For this reason and because the DRI station was discontinued in 2017, the County-operated gauge (No. SLO
795)is the sole source of precipitation data used in this 2023 Annual Report. Figure 5, on page 20, below, is
a composite graph combining data from the DRI and County stations and illustrating annual rainfall totals from
available data from 1950 through 2023 (on a calendar-year basis). Average annual rainfall for the NCMA is
approximately 15.6 inches.
Monthly rainfall and evapotranspiration (ET) for 2023 as well as average monthly historical rainfall and ET are
presented in Figure 7, on page 22, below. During 2023, below-average rainfall occurred for 5 months and
above-average rainfall occurred during the other 7 months. The total for the year was 23.75 inches, more than
8 inches above the average annual rainfall for the area.
Figure 5, on page 20, below, illustrates annual rainfall and shows several multi-year drought cycles (e.g., 6
years, 1984 through 1990) followed by cycles of above-average rainfall (e.g., 7 years, 1991 through 1998).
Except for 2010, the period 2007 through 2015 (8 years) experienced below-average annual rainfall indicating
a dry hydrologic period. This pattern continued into late 2016, when the hydrologic pattern appeared to have
broken the serious drought that the area (and state) had experienced for the previous 5 years. Annual rainfall
totals between 2016 and 2019 were normal fluctuations between wet and dry years. However, between 2019
and 2022, there was a return to drought conditions. The above average rainfall received in 2023 has resulted
in a return to normal conditions, as illustrated in Figure 5, on page 20, below.
12 Tri-Cities Mesa is an upland physiographic feature covering approximately four square miles. It is a remnant of the
deposition that was laid down, historically, by Pismo and Arroyo Grande Creeks. Older sand dunes now cover the area (DWR,
1970).
13 The Desert Research Institute (DRI) Western Regional Climate Center Pismo Station (Coop ID: 046943) was discontinued in
August of 2017.
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FIGURE 5. ANNUAL PRECIPITATION 1950 TO 2023
Northern Cities Management Area
San Luis Obispo County, California
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LEGEND
&<Active Weather Station
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Nipomo Mesa Management Area
Northern Cities Management Area
Santa Maria Valley Management Area
Location of Precipitation Stations
FIGURE 6
Northern Cities Management Area
San Luis Obispo County, California
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FIGURE 7. MONTHLY AND AVERAGE PRECIPITATION AND EVAPOTRANSPIRATION
Northern Cities Management Area
San Luis Obispo County, California 22 Page 131 of 306
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2.3 Evapotranspiration
CIMIS maintains weather stations in locations throughout the state to provide real-time wind speed, humidity,
and evapotranspiration data. The nearest CIMIS station to the NCMA is the Nipomo station (see Figure 6, on
page 21, above). The Nipomo station has gathered data since 2006. While this station may have been subject
to irrigation overspray in recent years (noted in Section 2.2, above), the apparent irrigation overspray does not
have a significant impact on the measurements used for calculating ET. The monthly ET data for the Nipomo
station is shown in Figure 7, on page 22, above, for 2023 and average conditions (over 10 years). The ET rate
affects recharge potential of rainfall and the amount of outdoor water use (irrigation).
2.4 Geology and Hydrogeology
The current understanding of the geologic framework and hydrogeologic setting is based on numerous
previous investigations, particularly Woodring and Bramlette (1950), Worts (1951), Miller and Evenson
(1966), DWR (1970, 1979, and 2002), Fugro (2015), Geoscience Support Services (2019 and 2021), and
Ramboll (2022).
The NCMA overlies the northwest portion of the SMRVGB. There are two principal aquifers in the NCMA portion
of the SMRVGB. Groundwater pumped from the sedimentary deposits that make up the main municipal
production aquifer underlying the NCMA is derived from the Paso Robles Formation 14 and the underlying
Careaga Sand.15 The Paso Robles Formation and Careaga Sand aquifers together are referred to as the deep
aquifer system in this report. All municipal pumping in the NCMA occurs on the Tri-Cities Mesa and is produced
from the deep aquifer.
The second principal aquifer is the alluvial aquifer, consisting of Quaternary-age alluvial sediments of Arroyo
Grande Creek, Los Berros Creek, and the Cienega Valley. All agricultural groundwater production in the Cienega
Valley is presumed to be extracted from a lower, confined to semi-confined portion of the alluvial aquifer (DWR,
1970).
Several faults either cross or form the boundary of the NCMA, as identified by DWR (2002), Pacific Gas &
Electric (PG&E) (PG&E, 2014), and others. The Oceano Fault (USGS, 2006) trends northwest-southeast across
the central portion of NCMA and has been extensively studied by PG&E (2014). Offshore, the Oceano Fault
connects with the Hosgri and Shoreline fault systems several miles west of the coast. Onshore, the Oceano
Fault consists of two mapped fault splays, including the main trace of the Oceano Fault as well as the Santa
Maria River Fault, which diverges northward of the Oceano Fault through the Cienega Valley before trending
into and across the Nipomo Mesa.
It is unknown the extent to which the Oceano and Santa Maria River faults impede groundwater flow within
the deep aquifer system materials. However, movement on the faults, as mapped by PG&E (2014), may
suggest a possible impediment to flow within the Careaga Sand and possibly the Paso Robles Formation.
PG&E (2014) suggests that the existence of the Santa Maria River Fault is “uncertain.” However, the water
elevation contour maps of the NCMA (Figure 8, on page 28, below, and Figure 9, on page 29, below) (discussed
14 The Plio-Pleistocene-age Paso Robles Formation aquifer consists of unconsolidated deposits ranging from fine to coarse
sand and gravel, silty to clayey sand and gravel, and fine to medium silty sand. Regionally, the formation is
compartmentalized into two to five aquifers zones designated from top to bottom as the A to E Zones. These aquifer zones are
separated by silt and clay confining beds near the coast and are generally merged inland (DWR, 1970).
15 The Pliocene-age Careaga Sand consists of unconsolidated to well-cemented calcareous coarse sand with gravel, fine to
medium sand, and silty sand. The Careaga Sand is of marine origin (DWR, 1970).
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in more detail in Section 3.1.1, below) may suggest that the Santa Maria River Fault plays a potential, but
unknown, role in groundwater flow across the NCMA.
The Wilmar Avenue Fault generally forms the northern boundary of the NCMA, apparently acting as a barrier
to groundwater flow from the older consolidated materials north of the fault southward into the SMRVGB.
There is no evidence, however, that the Wilmar Avenue Fault impedes alluvial flow in the Pismo Creek, Meadow
Creek, or Arroyo Grande Creek alluvial valleys.
2.5 Groundwater Flow
The groundwater system of the NCMA has several sources of recharge including precipitation, agricultural
return flow, seepage from stream flow, and subsurface inflow from adjacent areas. Precipitation-driven
recharge is enhanced by several stormwater retention ponds in NCMA.16 According to the DWR Bulletin 63-3
report (DWR, 1970), both the Paso Robles Formation aquifer and the lower confined portion of the Cienega
Valley alluvial aquifer are recharged primarily from subsurface groundwater inflow from the east, where the
overlying confining layers are thin to nonexistent (DWR, 1970). These recharge areas to the east include inland
reaches of Arroyo Grande Valley and portions of Nipomo Mesa (DWR, 1970). Groundwater quality data
presented in DWR Bulletin 63-3 (DWR, 1970), and corroborated with data available through the Central Coast
Regional Water Quality Control Board Irrigated Lands Regulatory Program (ILRP), show evidence of recharge
to the alluvial aquifer of the Cienega Valley from the Paso Robles Formation aquifer on the Nipomo Mesa.
However, this recharge mechanism appears to be slowing because of declining water levels on the Nipomo
Mesa as documented in recent NMMA annual reports (see Section 6.1.1, below).
The deep aquifer system is also recharged to a lesser extent by percolation of direct precipitation and
agricultural return flow on the Tri-Cities Mesa (DWR, 1970). In addition, some return flows occur from imported
surface supply sources including Lopez Lake and the California State Water Project (SWP). Discharge in the
region is dominated by groundwater production from pumping wells and minor discharge through
phreatophyte 17 consumption. Historically, hydraulic gradients show that subsurface outflow discharge occurs
westward from the groundwater basin to the ocean, as indicated by historical groundwater elevations observed
in wells throughout the NCMA. This subsurface outflow is an important control to limit the potential of seawater
intrusion. This westward gradient and direction of groundwater flow is still prevalent throughout the northern
portion of NCMA, although there is evidence that the westward gradient may have reversed in recent years in
the area south of Cienega Valley.
The following descriptions of the boundary conditions of the NCMA are derived primarily from Todd (2007).
The eastern boundary is coincident with the SLOFC&WCD Zone 3 management boundary and with the
northwestern boundary of the NMMA. Aquifer materials of similar formation, provenance, and characteristics
are present across most of this boundary, which allows subsurface flow to occur between the NCMA and
NMMA.
The northern and northwestern boundary, established by the Court during the 2005 Stipulation, is coincident
with the Wilmar Avenue Fault, which is located approximately along Highway 101 from Pismo Creek to the
southeastern edge of the Arroyo Grande Valley. There is likely insignificant subsurface flow from the
16 Within their jurisdictions, Arroyo Grande and Grover Beach each maintain stormwater retention ponds; the SLOFCWCD
maintains the stormwater system, including retention ponds, in OCSD. These ponds collect stormwater runoff, allowing the
runoff to recharge the underlying aquifers.
17 A phreatophyte is a deep-rooted plant that obtains a significant portion of the water that it needs from the water table.
Phreatophytes are plants that are supplied with surface water or the upper portion of the near-surface water table and often
have their roots constantly in touch with moisture.
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consolidated materials (primarily Pismo Formation) north of the Wilmar Avenue Fault across the boundary into
the SMRVGB; however, basin inflow occurs within the underflow associated with alluvial valleys of Arroyo
Grande and Pismo creeks.
The southern boundary of the NCMA is an east-west line, roughly located along the trend of Black Lake Canyon
and perpendicular to the coastline. Historically, it appears that groundwater flow is typically roughly parallel to
the boundary. This suggests that little to no subsurface inflow occurs across this boundary.
The western boundary of the NCMA follows the coastline from Pismo Creek in the north to Black Lake Canyon.
Given the generally westward groundwater gradient in the area, this boundary is the site of subsurface outflow
and is an important impediment to seawater intrusion. However, the boundary is susceptible to seawater
intrusion if groundwater elevations onshore decline, such as may be occurring seasonally in the southeast
portion of NCMA along the boundary with NMMA.
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SECTION 3: Groundwater Conditions
3.1 Groundwater Levels
Groundwater elevation data are gathered from the network of wells throughout the NCMA to monitor the
effects of groundwater use and recharge, and to monitor the threat of seawater intrusion. Over time, analysis
of these groundwater elevation data has included development of groundwater surface contour maps,
hydrographs, and an index of key sentry well water elevations. The historical groundwater elevation data are
provided in Appendix A.
3.1.1 Groundwater Level Contour Maps
Contoured groundwater elevations for the spring (April 2023) and fall (October 2023) monitoring events,
including data from the County monitoring program, are shown in Figure 8, on page 28, below, and Figure 9,
on page 29, below, respectively. From an increased understanding of the groundwater basin aquifer system
and to be consistent with recent work completed for the Phase 1B model, the groundwater elevation analysis
was performed separately for each of the two principal aquifers. As described earlier (see Section 2.4, above),
the two principal aquifers are the deep aquifer (consisting of the Paso Robles Formation and the Careaga
Sand) from which all municipal production is pumped, and the alluvial aquifer within the Cienega Valley, from
which all agricultural production is pumped.
Groundwater level contours for April 2023 are presented in Figure 8, on page 28, below. Spring groundwater
elevation contours in the deep aquifer system north of the Santa Maria River Fault show a westerly to
southwesterly groundwater flow. The groundwater gradient and flow in the deep aquifer system in the southern
portion of the NCMA are generally inferred on the basis of historical records, historical trends, and water level
data from the NMMA farther east. This is as a result of the limited number of wells and water level data in the
southernmost portion of the NCMA that is dominated by sensitive-species dunes and California State Parks
land.
Spring groundwater contours in the alluvial aquifer exhibit a gradient and flow direction that generally follows
the alignment of Arroyo Grande Creek. The alluvial groundwater contours also indicate an inflow of
groundwater from the Los Berros Creek drainage (Figure 8, on page 28, below).
Agricultural groundwater pumping results in seasonal drawdown of the alluvial aquifer in the Cienega Valley
south and east of Arroyo Grande Creek. As shown on Figure 8, on page 28, below, the April 2023 alluvial
groundwater elevations in the Cienega Valley are in the range of 5 feet to more than 50 feet North American
Vertical Datum 1988 (NAVD 88).18
April 2023 groundwater elevations in the deep aquifer system main production zone along the coast ranged
from 7.5 to 13.5 feet NAVD 88. Slight pumping effects are noted in the area of concentrated municipal
pumping on Tri-Cities Mesa.
18 Note that 0.0 NAVD 88 is 2.72 feet lower than mean sea level (MSL) and is 0.08 feet above the mean lower low water
(MLLW) (which can be thought of as the average height of the lowest tides), as recorded at the Port San Luis tide station
datum (https://tidesandcurrents.noaa.gov/datums.html?id=9412110).
Page 136 of 306
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LEGEND
Sentry Well
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Alluvial Groundwater Contour(feet, NAVD88)
Deep Groundwater Contour(feet, NAVD88)
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All Other Features
Northern Cities ManagementArea
Cienega Valley
Interstate
Watercourse
Groundwater Elevation Contours Spring 2023
FIGURE 8
Northern Cities Management AreaSan Luis Obispo County, California
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LEGEND
Sentry Well
!H Municipal Well
Alluvial Groundwater Contour(feet, NAVD88)
Deep Groundwater Contour(feet, NAVD88)
Alluvial Groundwater Flow
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All Other Features
Northern Cities ManagementArea
Cienega Valley
Interstate
Watercourse
FIGURE 9
Northern Cities Management AreaSan Luis Obispo County, California
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Groundwater Elevation Contours Fall 2023
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Groundwater elevation contours for October 2023 are presented in Figure 9, on page 29, above. Fall
groundwater contours in the deep aquifer system north of the Santa Maria River Fault show a generally west-
to-southwesterly groundwater flow, similar to conditions in the spring. Some minor pumping effects are evident
in the area of the municipal wells. In contrast to recent years, fall groundwater contours in the alluvial aquifer
show only minor pumping effects from agricultural groundwater production (Figure 9, on page 29, above).
Similar to observed trends for spring 2023, the fall alluvial groundwater contours indicate an inflow of
groundwater from the Los Berros Creek drainage (Figure 9, on page 29, above).
October 2023 groundwater elevations in the deep aquifer system main production zone along the coast
ranged from 8.2 to 12.5 feet NAVD 88.
3.1.2 Historical Water Level Trends
Hydrographs of five wells in the NCMA are presented in Figure 10, on page 31, below. Two of the wells are
completed in the deep aquifer system (32D03 and 32D11) and three of the wells are completed in the alluvial
aquifer within the Cienega Valley (28K02, 30K03, and 33K03).
The hydrographs for wells 32D03 and 32D11 (Figure 10, on page 31, below) are paired hydrographs for deep
aquifer system wells in the vicinity of the municipal wellfields. Depending on the duration of pumping of the
municipal wells, water levels in these wells historically have been below the levels of wells in other areas of
the NCMA for prolonged periods of time. The hydrographs show that, historically, groundwater elevations in
these wells generally have been above 0.0 NAVD 88. In 2007 to 2009, an area of lower groundwater
elevations (a trough) beneath the active wellfield appeared. Groundwater pumping was at its peak in 2007 to
2009 (in comparison with pumping of the last 30 years) and contributed to the apparent seawater intrusion
event in the coastal wells in 2009.
As illustrated in Figure 10, on page 31, below, the water elevations of all the wells, including the paired deep
aquifer system wells 32D03 and 32D11, exhibited a steady decline from 2011 to 2016, during which time
rainfall was below normal every year. In this period, groundwater elevations declined to near 0.0 NAVD 88 or,
in the case of alluvial aquifer well 33K03, to below 0.0 NAVD 88. By October 2016, the groundwater elevations
in these wells were generally below the levels observed in 2009–2010.
In 2016 and 2017, these five wells each exhibited an overall increase in water levels (with the exception of
the normal, seasonal decline during the summer), generally reaching similar water levels as observed in 2011.
In 2017, water levels returned to a generally declining trend in all the wells. This trend continued through
2022, until 2023 when water levels rebounded rapidly in response to the wet winter of 2022/2023.
3.1.3 Sentry Wells and the Deep Well Index
Regular monitoring of water elevations in clustered sentry wells located along the coast are an essential tool
for tracking critical groundwater elevation changes at the coast. Groundwater elevations in these wells are
monitored quarterly as part of the sentry well monitoring program. As shown by the hydrographs for the five
sentry well clusters (Figure 11, on page 32, below), the sentry wells provide a long history of groundwater
elevations.
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FIGURE 10. SELECTED HYDROGRAPHS
Northern Cities Management Area
San Luis Obispo County, California
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Well 32D03
Well 32D11
Water Elevation, feet NAVD8832D03 and 32D11
28K02
30K03
33K03
Notes:
NAVD88 - North American Vertical Datum of 1988
31 Page 140 of 306
FIGURE 11. SENTRY WELL HYDROGRAPHS
Northern Cities Management Area
San Luis Obispo County, California
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Well 24B03
Well 24B02
Water Elevation, feet NAVD88North Beach Campground
Highway 1
Pier Avenue
Oceano Dunes
Well 30F03
Well 30F02
Well 30N02
Well 30N03
Well 36L01
Well 36L02
Flowing Artesian
Flowing Artesian
Flowing Artesian
Notes:
NAVD88 - North American Vertical Datum of 1988
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Inspection of the recent data shown in Figure 11, on page 32, above, compared with the historical record
illustrates some noteworthy trends:
From 2013 until near the end of 2016, the water level trend of well 30N02—one of the wells that
experienced elevated total dissolved solids (TDS) and chloride levels (i.e., water quality degradation) in
2009–2010—looked quite similar to the water level trend of the well in 2007–2010, immediately before
and during the period of incipient seawater intrusion. This trend was noteworthy and alarming. Then,
between 2016 and 2020, the downward trend reversed with water elevations seasonally fluctuating
around 8 feet above 0.0 NAVD 88. In 2021, water elevations again began trending downward, bottoming
out in fall 2022 at levels similar to the two previous low points before rebounding rapidly in 2023.
The decline in water levels from 2005 to 2016 in the Oceano Dunes wells (36L01 and 36L02) was also
notable and potentially significant, particularly in well 36L01, which is screened across the Paso Robles
Formation. Between the end of 2016 and continuing through 2020, both wells had recovered to less-
alarming levels. Similar to well 30N02, water elevations in the Oceano Dunes wells again returned to a
downward trend until both wells reached historical low water elevations in fall 2022. Since fall 2022 water
levels have rebounded rapidly in response to the wet winter of 2022/2023.
The deepest wells in the clusters, 24B03, 30F03, and 30N02, were previously identified as critical wells to
monitor for potential seawater intrusion and were suggested to reflect the net effect of changing groundwater
recharge and discharge conditions in the primary production zone of the deep aquifer system. One of the
thresholds to track the status and apparent health of the aquifer is to average the groundwater elevations
from these three deep sentry wells to generate a single, representative index, called the Deep Well Index.
Previous studies suggested a Deep Well Index value of 7.5 feet above 0.0 NAVD 88 as a minimum threshold,
or trigger value, below which the aquifer is at risk for eastward migration of seawater and a subsequent threat
of seawater intrusion. Historical variation of the Deep Well Index is shown in Figure 12, on page 34, below.
Inspection of the Deep Well Index in 2008–2009, before the period of water quality degradation in wells
30N03 and 30N02, shows that the Deep Well Index dropped below the 7.5-foot trigger value and remained
below that level for almost 2 years. Since the start of the drought in 2011, the Deep Well Index dropped several
times below the threshold, but usually for only a few months at a time.
In 2023, the Deep Well Index started the year above the trigger value with an index value of more than 9 feet
in January. The index value continued to climb through early April, peaking over 12 feet, and then generally
declined through early September, reaching a low point just over 10 feet. Since early September the index
value has increased steadily, finishing the year at about 12 feet NAVD 88 (Figure 12, on page 34, below).
Key wells—including 24B03, 30F03, 30N02, 36L01, 36L02, and 32C03—are instrumented with pressure
transducers equipped with specific conductivity (conductivity) probes that periodically record water level, water
temperature, and conductivity (Figures 13 through 18, on pages 35 through 40, below). Occasional transducer
malfunctions have resulted in variable conductivity data in some of the wells during certain years, including
2015 and 2019. Malfunctioning transducers have been replaced and continue to be monitored in an ongoing
effort to maintain a properly functioning monitoring network. A key technological upgrade accomplished in
2022 was the addition of telemetry to the pressure transducers installed in the Deep Well Index wells (24B03,
30F03, and 30N02). This upgrade provides real-time monitoring of the Deep Well Index allowing for informed,
timely decision-making regarding the management of NCMA groundwater resources.
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FIGURE 12. HYDROGRAPH OF DEEP WELL INDEX ELEVATION
Northern Cities Management Area
San Luis Obispo County, California
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NAVD88 - North American Vertical Datum of 1988
mg/L - milligrams per liter
1965 1970 1975 1980 1985 1990 1995 2000 2005 2010 2015 2020 2025
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(Wells 24B03, 30F03 and 30N02)
Deep Well Index (Approximate)
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300
400
500
600
700
800
Chloride, mg/LWell 30N02
Well 24B03
Well 30F03
Deep Well Index Threshold: 7.5 feet
Deep Well Index is the synoptic average of groundwater
elevations in the deep wells of Sentry Well clusters 24B,
30F, and 30N (see Figure 3 for locations of monitoring
wells and Figure 4 for well depths).
"Approximate" Deep Well Index elevations are based on
non-synoptic measurments, made during the same quarter.
34 Page 143 of 306
FIGURE 13. WATER ELEVATION, CONDUCTIVITY, AND TEMPERATURE, WELL 24B03
Northern Cities Management Area
San Luis Obispo County, California
2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023
-5-4-3-2-101234567891011121314151617181920Water Elevation, feet NAVD880
400
800
1,200
1,600
2,000
SpecificConductivityuS/cmWell 24B03
North Beach Campground Deep Well
Well Depth: 435 feet (Careaga Sand)
Deep Well Index
65
67
69
71
73
TemperatureºFDeep Well Index
Threshold: 7.5 feet
P:\Portland\672-Northern Cities Management Area\_Grapher Figures\Annual Rpt Figs Fig 13 NCMA Well 24B03.grf
Notes:
NAVD88 - North American Vertical Datum of 1988
uS/cm - microsiemens per centimeter
Data gap due to accidental removal of transducers by SLO Co.
35 Page 144 of 306
FIGURE 14. WATER ELEVATION, CONDUCTIVITY, AND TEMPERATURE, WELL 30F03
Northern Cities Management Area
San Luis Obispo County, California
2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023
-5-4-3-2-101234567891011121314151617181920Water Elevation, feet NAVD880
400
800
1,200
1,600
2,000
SpecificConductivityuS/cmWell 30F03
Highway 1 Deep Well
Well Depth: 372 feet (Careaga Sand)
Deep Well Index
65
67
69
71
73
TemperatureºFDeep Well Index
Threshold: 7.5 feet
P:\Portland\672-Northern Cities Management Area\_Grapher Figures\Annual Rpt Figs Fig 14 NCMA Well 30F03.grf
Notes:
NAVD88 - North American Vertical Datum of 1988
uS/cm - microsiemens per centimeter
Data gap due to accidental removal of transducers by SLO Co.
36 Page 145 of 306
FIGURE 15. WATER ELEVATION, CONDUCTIVITY, AND TEMPERATURE, WELL 30N02
Northern Cities Management Area
San Luis Obispo County, California
-5-4-3-2-101234567891011121314151617181920Water Elevation, feet NAVD882013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023
0
400
800
1,200
1,600
2,000
SpecificConductivityuS/cmWell 30N02
Pier Avenue Deep Well
Well Depth: 255 feet (Paso Robles Formation)
Deep Well Index
63
65
67
69
71
TemperatureºFP:\Portland\672-Northern Cities Management Area\_Grapher Figures\Annual Rpt Figs Fig 15 NCMA Well 30N02.grf
Deep Well Index
Threshold: 7.5 feet
Sensor malfunction. Field
measurements indicate that
specific conductivity is stable
Notes:
NAVD88 - North American Vertical Datum of 1988
uS/cm - microsiemens per centimeter
Data gap due to accidental removal of transducers by SLO Co.
37 Page 146 of 306
FIGURE 16. WATER ELEVATION, CONDUCTIVITY, AND TEMPERATURE, WELL 36L01Northern Cities Management AreaSan Luis Obispo County, California2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023-5-4-3-2-101234567891011121314151617181920Water Elevation, feet NAVD8804008001,2001,6002,000SpecificConductivityuS/cmWell 36L01Oceano Dunes Deep WellWell Depth: 237 feet (Paso Robles Formation)6567697173TemperatureºFP:\Portland\672-Northern Cities Management Area\_Grapher Figures\Annual Rpt Figs Fig 16 NCMA Well 36L01Notes:NAVD88 - North American Vertical Datum of 1988uS/cm - microsiemens per centimeter38 Page 147 of 306
FIGURE 17. WATER ELEVATION, CONDUCTIVITY, AND TEMPERATURE, WELL 36L02
Northern Cities Management Area
San Luis Obispo County, California
2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023
-5-4-3-2-101234567891011121314151617181920Water Elevation, feet NAVD880
400
800
1,200
1,600
2,000
SpecificConductivityuS/cmWell 36L02
Oceano Dunes Deep Well
Well Depth: 545 feet (Careaga Sand)
Well 36L02 Manual Measurements
65
67
69
71
73
TemperatureºFP:\Portland\672-Northern Cities Management Area\_Grapher Figures\Annual Rpt Figs Fig 17 NCMA Well 36L02.grf
Transducer data corrupted
Dashed where inferred
Sensor malfunction. Field measurements indicate that specific conductivity is stable
Notes:
NAVD88 - North American Vertical Datum of 1988
uS/cm - microsiemens per centimeter
39 Page 148 of 306
FIGURE 18. WATER ELEVATION, CONDUCTIVITY, AND TEMPERATURE, WELL 32C03Northern Cities Management AreaSan Luis Obispo County, California2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023-4-20246810121416182022242628Water Elevation, feet NAVD8804008001,2001,6002,000SpecificConductivityuS/cm6567697173TemperatureºFWell 32C03 (County Monitoring Well No. 3)Well Depth: 170 feet (Paso Robles Formation)P:\Portland\672-Northern Cities Management Area\_Grapher Figures\Annual Rpt Figs Fig 18 NCMA Well 32C03Notes:NAVD88 - North American Vertical Datum of 1988uS/cm - microsiemens per centimeter40 Page 149 of 306
Final | Northern Cities Management Area
2023 Annual Monitoring Report
GSI Water Solutions, Inc. 41
Wells 24B03, 30F03, and 30N02 comprise the wells used to calculate the Deep Well Index. Wells 36L01 and
36L02 are adjacent to the coast. Well 32C03 is the easternmost well and adjacent to the boundary between
the NCMA and NMMA. The following discusses 2023 water levels for these key wells:
Deep Well Index Wells: Water levels in the Deep Well Index wells increased throughout the early part of
2023 in response to above average precipitation received during the 2022/2023 winter season.
Water levels peaked in 30N02 in early April and in 24B03 and 30F03 in early June. The water levels in
wells 24B03, 30F03, and 30N02 then slightly declined until early September when they began to rise.
Consistent with patterns seen in previous years is the variability of aquifer response among the three
wells. Well 24B03, the northernmost well and located in the North Beach Campground, maintains a
relatively stable and moderated water level throughout the year and consistently sustains groundwater
elevations higher than the Deep Well Index value. The water level in 24B03 mitigates the water levels
in 30N02, which typically maintain levels consistently deeper than the Deep Well Index. Well 30F03
generally closely follows the Deep Well Index value.
Coastal Wells: The groundwater elevation in well 36L01, screened within the Paso Robles Formation,
remained within 5.5 to nearly 10 feet above 0.0 NAVD 88 throughout 2023. These levels are within the
historical range; however, groundwater elevations in 36L01 reached historical high levels, not seen since
2017. The water level in well 36L02, which is screened within the Careaga Sand, illustrates a much greater
seasonal fluctuation than is observed in 36L01. The water elevation in 36L02 ranged from more than 14
feet in April to approximately 3.5 feet NAVD 88 in the fall.
NCMA/NMMA Boundary: In 2023, well 32C03 recovered to levels well above 0.0 NAVD 88, with a seasonal
low value of more than 6 feet NAVD 88 in September. This is a turnaround from the below 0.0 NAVD 88
seasonal low levels experienced in 2021 and 2022. The 2023 seasonal high water level in well 32C03 is
the highest seen since early 2017.
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3.2 Change in Groundwater in Storage
The relative change of groundwater levels and associated change in groundwater in storage in the NCMA
portion of the SMRVGB between April 2022 and April 2023 were estimated using a comparison of water level
contour maps created for these periods. Separate estimates of change in groundwater in storage were
computed for both the deep aquifer system and for the alluvial aquifer and then summed together to represent
the total NCMA estimated change in groundwater in storage. The comparison of the April water levels was
chosen to comply with DWR reporting requirements and SGMA.
For each aquifer, the groundwater contour lines from each period were compared and the volumetric
difference between the two periods was calculated. The results are presented in Figure 19, on page 43, below,
and Figure 20, on page 44, below, which show contours of equal difference between April 2022 and April
2023 water elevations in the deep aquifer system and the alluvial aquifer, respectively. Figure 19, on
page 43, below, shows that deep aquifer system water elevations increased throughout the NCMA, with the
largest increases occurring along the southeastern border with NMMA. There was a positive net change in
groundwater in storage in the deep aquifer. Figure 20, on page 44, below, shows that increases in alluvial
aquifer water elevations occurred throughout the Cienega Valley, with the largest increases occurring in the
areas of inflow from Arroyo Grande and Los Berros Creeks. There was a positive net change in groundwater in
storage in the alluvial aquifer.
From the change of water levels maps, a volumetric change in groundwater in storage estimate was made for
each aquifer, based on assumed aquifer properties,19 and then summed to represent the total NCMA
estimated change in groundwater in storage. The net changes in groundwater levels in both aquifers
represents a net increase of groundwater in storage from April 2022 to April 2023 of approximately 3,610 AF
(compared to a net increase of 270 AF during the previous year). This is the largest single-year increase in
groundwater in storage observed since tracking of this attribute began in 2016.
19 A storage coefficient of 0.02 was used for the deep aquifer system. This is representative of the Paso Robles Formation
and Careaga Sand in the area, as documented in the SMRVGB Characterization Project (Fugro, 2015).
A specific yield value for the alluvial aquifer of 0.09 was back-calculated using the 2019 estimated change in alluvial
groundwater in storage represented by the calculated agricultural demand (see Section 4.2.1, below) and an alluvial
groundwater elevation change map representing the total volume change that occurred between April 2019 and October
2019.
Page 151 of 306
5515SA
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TPismoCreek
Arroyo Grande Cre e kMeadowCreek LosB erros Creek
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10555
Date: January 25, 2024 Data Sources: SLO County, USGS, NCMA and NMMA Agencies,California Geological Survey, ESRI, Maxar Imagery (2020)
LEGEND
Contour of Equal Differencein Water Level, feet
Area of Net Rise
All Other Features
Northern Cities ManagementArea
Fault (dashed whereinferred)
Interstate
Watercourse
FIGURE 19
Northern Cities Management AreaSan Luis Obispo County, California
Document Path: Y:\0672_Northern_Cities_Management_Area\Source_Figures\010_2023_Annual_Report\Figure19_Water Level Change_Spring2022_2023_Deep.mxd
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MilesP A C I F I C O C E A N
Change in Groundwater Elevation, Deep Aquifer SystemApril 2022 to April 2023
43 Page 152 of 306
10205SA
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LEGEND
Contour of Equal Difference inWater Level, feet
Area of Net Rise
All Other Features
Northern Cities ManagementArea
Fault (dashed where inferred)
Interstate
Watercourse
FIGURE 20
Northern Cities Management AreaSan Luis Obispo County, California
Document Path: Y:\0672_Northern_Cities_Management_Area\Source_Figures\010_2023_Annual_Report\Figure20_Water Level Change_Spring2022_2023_Qal.mxd
o 0 1
MilesP A C I F I C O C E A N
Change in Groundwater Elevation, Alluvial AquiferApril 2022 to April 2023
Date: January 25, 2024 Data Sources: SLO County, USGS, NCMA and NMMA Agencies,California Geological Survey, ESRI, Maxar Imagery (2020)
44 Page 153 of 306
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2023 Annual Monitoring Report
GSI Water Solutions, Inc. 45
3.3 Water Quality
Water is used in several ways in the NCMA, and each use requires a certain minimum water quality. Because
contaminants from seawater intrusion or from anthropogenic sources can potentially impact the quality of
water in the aquifer, water quality is monitored at each of the sentry well locations in the NCMA and County
Monitoring Well No. 3 (32C03).
3.3.1 Quarterly Groundwater Monitoring
Quarterly groundwater monitoring events occurred in February20, April, July, and October 2023. During each
event, depths to groundwater were measured, and wells were sampled using procedures, sampling
equipment, and in-field sample preservation protocol pursuant to ASTM International Standard D4448-01.
The water quality data from these events and historical data from these wells are provided in Appendix A.
Graphs of historical chloride and TDS concentrations over time are presented in Figure 21, on page 46, below,
and Figure 22, on page 47, below, respectively, to monitor for trends that may aid in the detection of impending
seawater intrusion.
The historical water quality data show that concentration levels of chlorides and TDS, as well as other
constituents, have remained relatively stable within a narrow historical range since 2009. Improved
management of municipal groundwater use, because of an overall reduction in pumping since 2009, has likely
contributed to the past several years of relatively stable groundwater quality.
In the first quarter of 2022 water quality results in OCSD MW-Yellow exhibited a change of water quality type
when compared to historical records. As a result of the unusual Q1 water quality results in OCSD MW-Yellow
the well was resampled in February 2022. Results from the re-sample analysis confirm the Q1 shift in water
quality in OCSD MW-Yellow. Considering the nearly identical water quality results between the OCSD MW-
Yellow and MW-Blue wells, it was concluded that the well casing in the MW-Yellow completion has become
compromised and open to the formation within a similar strata as the MW-Blue perforated interval (~190 to
265 feet below ground surface). Therefore, the MW-Yellow well completion is no longer representative of the
625 to 645 feet below ground surface interval of the Careaga Sand (see Figure 4, on Page 15, above) and has
been removed from the NCMA Monitoring Program. In the second quarter of 2022 MW-Yellow was sounded
to its full depth of completion (645 feet), indicating that the well casing has not yet fully collapsed. Well
abandonment for the MW-Yellow completion should be considered before further deterioration occurs.
20 The usual January timeframe Q1 sampling event was attempted but thwarted by flood conditions due to large rainfall
events in December 2022 and January 2023.
Page 154 of 306
FIGURE 21. CHLORIDE CONCENTRATIONS IN MONITORING WELLSNorthern Cities Management AreaSan Luis Obispo County, California2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 20230100200010020001002000100200P:\Portland\672-Northern Cities Management Area\_Grapher Figures\Annual Rpt Figs Fig 21 NCMA Chloride GroupedWell 24B03Well 24B02Well 30F01Well 30F02Well 30F03Well 30N03Well 30N02Well 36L02Well 36L01Well 32C03Chloride Concentration, mg/LNorth Beach CampgroundHighway 1Pier AvenueOceano Dunes and 32C03Notes:mg/L - milligrams per liter46 Page 155 of 306
FIGURE 22. TOTAL DISSOLVED SOLIDS CONCENTRATIONS IN MONITORING WELLSNorthern Cities Management AreaSan Luis Obispo County, California2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 202305001,0001,50005001,0001,50005001,0001,50005001,0001,500P:\Portland\672-Northern Cities Management Area\_Grapher Figures\Annual Rpt Figs Fig 22 NCMA TDS GroupedWell 24B03Well 24B02Well 30F01Well30F02Well 30F03Well 30N03Well 30N02Well 36L02Well 36L01Well 32C03Total Dissolved Solids Concentration, mg/LNorth Beach CampgroundHighway 1Pier AvenueOceano Dunes and 32C03Notes:mg/L - milligrams per liter47 Page 156 of 306
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2023 Annual Monitoring Report
GSI Water Solutions, Inc. 48
3.3.2 Analytical Results Summary
Analytical results of key water quality data, including chloride, TDS, and sodium, were generally consistent with
historical concentrations and observed ranges of constituent concentrations during 2023. In general, no water
quality results were observed that are a cause of concern.
Figure 23A through D, beginning on page 50, below, are a set of Piper diagrams, representing groundwater
sampling results from each of the quarterly sampling events in 2023. The Piper diagram provides a means of
presenting the relative abundance of common ions (cations and anions) of each water quality sample. The
relative abundance of common ions in each water quality sample, including cations; sodium, calcium,
magnesium, and potassium, and anions; bicarbonate, chloride, and sulfate, determine the ‘water quality type’
of the sample. Examples of different water quality types include ‘calcium-magnesium-sulfate’ type (i.e., 30N02
and 36L01), ‘sodium-chloride’ type (i.e., 32C03), and ‘calcium-bicarbonate’ type (all remaining monitored
wells). The Piper diagrams (Figure 23A–D, beginning on page 50, below) show the quarterly 2023 water quality
results, which generally fall into these three water quality type groupings. The relative abundance of common
ions found in seawater is presented as a red “X” on the Piper diagrams for reference purposes. Well 32C03
generally demonstrates the most similar signature to seawater; however, the TDS present in 32C03 are more
than two orders of magnitude lower than that of seawater.21 In the event of possible future incipient seawater
intrusion, a migration towards the seawater base (red “X”) would be expected for the affected well(s) on the
Piper diagram.
Three separate water quality types are found in the monitoring wells:
1.The Pier Avenue deep well (30N02), screened in the Paso Robles Formation from 175 to 255 feet bgs,
and Oceano Dunes intermediate well (36L01), screened in the Paso Robles Formation from 227 to
237 feet bgs, are screened in the same production zone. This is despite their different nomenclature
as “deep” compared with “intermediate” wells. Relative to the other wells in the area, these two wells
are high in sulfates and have calcium-magnesium-sulfate-rich water. Both wells are relatively low in
chloride. This is significant because this zone, and well 30N02, was the site of an apparent seawater
intrusion event in 2009–2010.
2.The County Monitoring Well No. 3 (32C03), screened from 90 to 170 feet bgs, in the Paso Robles
Formation, has an apparent water quality that is different than any of the other wells in the area. It is
relatively high in sodium, chloride, and potassium. Its location in the right quadrant of the diamond-
shaped part of the Piper diagram (Figure 23A–D, beginning on page 50, below) commonly
characterizes a sodium-chloride-rich groundwater representative of marine or deep ancient
groundwater, even though it is a relatively shallow well and screened within the Paso Robles
Formation, a Plio-Pleistocene-age alluvial deposit.
3.All of the other wells in the monitoring network fall into the third category of groundwater water quality.
These wells are all generally a calcium-bicarbonate groundwater that is commonly associated with
shallow groundwater. This grouping of water quality represents groundwater from wells that are
screened in both the Paso Robles Formation and the Careaga Sand (wells 24B03, 30F03, and 36L02
are screened in the Careaga Sand; the others are screened in the Paso Robles Formation).
None of the water quality results from monitoring wells throughout 2021 indicate an incipient episode or
immediate threat of seawater intrusion. There have been no water quality results indicative of seawater
intrusion since the decline of TDS, sodium, and chloride concentrations detected in Paso Robles Formation
21 The concentration of TDS in well 32C03 is generally the lowest out of all 16 historically monitored wells in NCMA.
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wells 30N02, 30N03, and OCSD MW-Blue following the 2009–2010 seasons. No indications of seawater
intrusion have been observed in wells screened in the underlying Careaga Sand. At this time, without additional
offshore data, the precise location of the interface or mixing zone is not known and will not be known unless
and until it intercepts a monitoring well. However, the airborne electromagnetic survey conducted in 2020
(Ramboll, 2022) indicates that no seawater intrusion was occurring in the deep aquifer system at the time of
the survey, and that the interface generally conformed to the Ghyben-Herzberg ratio.22 Note that a second
airborne electromagnetic survey was conducted in November 2023. The data from this survey are expected
to be available by the third quarter of 2024.
22 Under normal conditions, the higher density of saltwater causes it to move into coastal aquifers in a wedge shape under the
freshwater. The shape of the saltwater wedge is described by the Ghyben–Herzberg ratio which states that, for every foot of
fresh water in an unconfined aquifer above sea level, there will be forty feet of fresh water in the aquifer below sea level
(Ploessel, 1982).
Page 158 of 306
FIGURE 23A.
PIPER DIAGRAMS OF WATER QUALITY IN SELECT MONITORING WELLS - 2023 Q1 RESULTS
Northern Cities Management Area
San Luis Obispo County, California
50 Page 159 of 306
FIGURE 23B.
PIPER DIAGRAMS OF WATER QUALITY IN SELECT MONITORING WELLS - 2023 Q2 RESULTS
Northern Cities Management Area
San Luis Obispo County, California
51 Page 160 of 306
FIGURE 23C.
PIPER DIAGRAMS OF WATER QUALITY IN SELECT MONITORING WELLS - 2023 Q3 RESULTS
Northern Cities Management Area
San Luis Obispo County, California
52 Page 161 of 306
FIGURE 23D.
PIPER DIAGRAMS OF WATER QUALITY IN SELECT MONITORING WELLS - 2023 Q4 RESULTS
Northern Cities Management Area
San Luis Obispo County, California
53 Page 162 of 306
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SECTION 4: Water Supply and Production/Delivery
4.1 Water Supply
The NCMA water supply consists of three major sources, including Lopez Lake, the SWP, and groundwater.
Each source of supply has a defined delivery volume that varies from year to year.
4.1.1 Lopez Lake
The Lopez Project consists of Lopez Lake, Lopez Dam, Lopez Terminal Reservoir, and Lopez Water Treatment
Plant and is operated by SLOFCWCD Zone 3. SLOFCWCD Zone 3 provides treated water directly to the Zone 3
contractors and releases water to Arroyo Grande Creek for habitat conservation and agricultural use. The
Zone 3 contractors include Arroyo Grande, Grover Beach, Pismo Beach, OCSD, and County Service Area (CSA)
12, which serves Avila Beach and is not in the NCMA.
The operational safe yield of Lopez Lake is 8,730 AFY, which reflects the amount of sustainable water supply.
Of this, 4,530 AFY is apportioned to the contractors and 4,200 AFY is reserved for downstream releases to
maintain flows in Arroyo Grande Creek and provide groundwater recharge. Contract changes that went into
effect at the end of October 2022 allow Zone 3 contractors to store unused entitlement water and downstream
release water in the reservoir for later use (see further details below). The 2023 SLOFCWCD Zone 3
entitlements are shown in Table 2, below.
Table 2. Lopez Lake (SLOFCWCD Zone 3 Contractors) Water Entitlements (AFY)
Contractor
Contract Water
Entitlement
(AFY)
Percent of Total
Arroyo Grande 2,290 50.55%
Grover Beach 800 17.66%
Pismo Beach 892 19.69%
OCSD 303 6.69%
CSA 12 (not in NCMA) 245 5.41%
Total 4,530 100%
Downstream Releases 4,200 —
Safe Yield of Lopez Lake 8,730 —
Notes
— = not applicable AFY = acre-feet per year CSA = County Service Area NCMA = Norther Cities Management Area
OCSD = Oceano Community Services District SLOFCWCD = County of San Luis Obispo Flood Control & Water Conservation District
In December 2014, SLOFCWCD Zone 3 adopted the Low Reservoir Response Plan (LRRP) (SLOFCWCD, 2014).
The LRRP establishes actions that SLOFCWCD Zone 3 can take when the amount of water in storage in the
reservoir drops below 20,000 AF, provided that the SLOFCWCD Board of Supervisors declares a drought
emergency. The purpose of the LRRP is to limit downstream releases and municipal diversions from Lopez
Lake to preserve water within the reservoir, above the minimum pool, for a minimum of 3 to 4 years under
drought conditions.
The reduction strategies for the LRRP are tied to the amount of water in the reservoir. As the amount of water
in the reservoir drops below the triggers (20,000; 15,000; 10,000; 5,000; and 4,000 AF), the hydrologic
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conditions are reviewed, and adaptive management is used to meet the LRRP objectives. The municipal
diversions are to be reduced according to the strategies shown in Table 3, below.
Table 3. Lopez Lake Municipal Diversion LRRP Reduction Strategy
Amount of Water
in Storage (AF)
Municipal Diversion
Reduction AFY
20,000 0% 4,530
15,000 10% 4,077
10,000 20% 3,624
5,000 35% 2,941
4,000 100% 0
Notes
AF= acre-feet AFY = acre-feet per year LRRP = Low Reservoir Response Plan
The initial prescribed actions after the LRRP is enacted include (1) reductions in entitlement water deliveries;
(2) reductions in downstream releases; (3) no new allocations of surplus water from unreleased downstream
releases; and (4) extension of time that agencies can take delivery of existing unused water throughout the
duration of the drought emergency, subject to evaporation losses if the water is not used in the year of original
allocation. Included in the LRRP is an adaptive management provision that allows the initial prescribed actions
to be modified and adapted to the specific drought conditions.
The initial prescribed actions with respect to downstream releases are that they should be reduced according
to the strategies described in Table 4, below. The release strategies represent the maximum amount of water
that can be released. The SLOFCWCD Zone 3 controls the timing of the reduced releases to meet the needs
of the agricultural stakeholders and to address environmental requirements.
Table 4. Lopez Lake Downstream Release LRRP Reduction Strategy
Amount of Water
in Storage (AF)
Downstream Release
Reduction AFY
20,000 9.5% 3,800
15,000 9.5% 3,800
10,000 75.6% 1,026
5,000 92.9% 300
4,000 100% 0
Notes
AF= acre-feet AFY = acre-feet per year LRRP = Low Reservoir Response Plan
The LRRP was put into effect on April 1, 2015. Throughout 2015 and all of 2016, SLOFCWCD Zone 3 operated
Lopez Lake pursuant to the 15,000 AF diversion reduction trigger that required a 10 percent reduction in
municipal diversions. The 10,000 AF trigger requiring a 20 percent reduction was avoided in 2016 because
the agencies enacted mandatory water conservation measures and voluntarily reduced municipal diversions
from Lopez Lake by 20 percent. Lopez Lake recovered from a low of 11,000 AF in storage to a peak of more
than 30,000 AF in May 2017, ending with approximately 25,000 AF at the start of 2018 because of the
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relatively heavy rainfall year of late 2016 and early 2017. Although contractually the LRRP is no longer in
effect when both triggers are rescinded (i.e., the Board of Supervisors declaration of water emergency and
reduction of reservoir levels to below 20,000 AF), the SLOFCWCD Zone 3 agencies resolved to keep the LRRP
in effect. Because the reservoir volume was above 20,000 AF, no mandatory reductions in municipal deliveries
were required in 2017, 2018, or 2019. In 2020, the reservoir storage level stayed above 20,000 AF until
December, when it reached a level of 19,826 AF. The LRRP was not activated during 2020.
In 2021, the high reservoir storage level occurred in January, at 19,874 AF. The reservoir storage level declined
throughout most of 2021, reaching a low point of 14,174 AF in November. With the declining reservoir storage
approaching the 15,000 AF trigger level, the Board of Supervisors voted on August 24, 2021, to enact the
LRRP and the initial prescribed action of a 10 percent municipal entitlement reductions (retroactive to April
2021) was put in place. The year 2021 ended with reservoir storage at just less than 15,000 AF. On July 21,
2022, the Zone 3 Advisory Committee endorsed a 20 percent municipal entitlement reduction (retroactive to
April 2022) in anticipation of reaching the 10,000 AF trigger of the LRRP. Throughout 2022 reservoir levels
continued to drop until reaching a low point of 10,837 AF on December 10, 2022. Above normal precipitation
occurring during the second half of December resulted in reservoir levels recovering to 11,690 AF by the end
of 2022. The LRRP remained in effect with 20 percent municipal entitlement reductions through the end of
2022.
As a result of above average rainfall in January through March 2023 the Lopez Lake storage level rapidly
increased to 26,602 AF in January, 30,439 AF in February, to max capacity (49,200 AF) and spilling in March
2023. The reservoir continued to spill through June 2023, after which reservoir levels slowly began to decline
through October, reaching a low of 46,998 AF in storage. On January 19, 2023, the Zone 3 Advisory Committee
approved exit from the LRRP and a return to 100 percent Lopez entitlements retroactive to April 1, 2022. The
Lopez Lake storage level was 47,365 AF at the end of 2023.
As a result of recent contract changes that went into effect at the end of October 2022, the Zone 3
subcontractors are now able to store their unused annual water entitlement and any surplus water they receive
in Lopez Reservoir, as well as allow for in-lieu storage of SWP water. In other words, each subcontractor now
has a stored water account. The purpose of these changes is to provide subcontractors greater flexibility to
better manage their water supply portfolios and incentivize conservation of water during emergencies and
droughts. The changes provide the subcontractors greater flexibility to use their water supplies conjunctively
(i.e., to implement a balanced use of surface and groundwater supplies based on hydrologic conditions) and
additionally allows subcontractors to transfer stored Lopez and SWP water amongst themselves to improve
water supply availability during drought conditions and water supply resiliency for the region.
Under the new Zone 3 contracts, Surplus water is generated by unused downstream releases from the prior
Zone 3 water year (April 1 through the following March 31) and Stored water is generated by unused
entitlement water. Unlike Surplus water, Stored water can accrue and be accessed indefinitely as long as the
stored quantity does not get lost in a spill. When the new contracts were adopted in October 2022, existing
Surplus water for each contractor was converted into Stored water as a one-time deal. However, all the Stored
water was lost because of the prolonged spill event that occurred from March through June 2023.
During a month when the reservoir is spilling, Zone 3 contractors are able to take as much of their
proportionate share of the spilled volume as they chose without incurring debit against their contract
entitlement amount (each contractor’s proportionate share is shown in Table 2, above). For example, Arroyo
Grande’s contracted entitlement share is 50.55 percent, so they get 50.55 percent of the total spilled volume
credited towards their usage that month (personal communication with David Spiegel, SLOFCWCD, on January
25, 2024). However, while the reservoir is spilling contractors also lose any Surplus and Stored water they
may have at the same rate.
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The total deliveries from Lopez Lake in 2023 was 6,780 AF, of which 3,493 AF were delivered to NCMA
contractors, 76 AF were delivered to CSA 12, and 3,211 AF were released downstream to maintain flow in
Arroyo Grande Creek (Table 5, below).
Lopez Lake Surplus and Stored water deliveries to the NCMA agencies were both 0 AF and deliveries of Lopez
Lake spill water to NCMA agencies totaled 1,114 AF in 2023 (Table 5, below).
Table 5. Lopez Lake Deliveries, 2023
Contractor
Entitlement
Usage
(AF)
Lopez
Stored (AF)
Surplus
Usage
(AF)
Lopez Spill
(AF)
Total Lopez Lake
Water Delivery
(AF)
Arroyo Grande 1,353 0 0 514 1,867
Grover Beach 565 0 0 228 793
Pismo Beach 158 0 0 275 433
OCSD 303 0 0 97 400
Total NCMA 2023 Usage 2,379 0 0 1,114 3,493
CSA 12 (not in NCMA) 53 0 0 23 76
Downstream Releases 3,211 — — — 3,211
Total 2023 Lopez Lake
Deliveries 5,643 0 0 1,137 6,780
Notes
— = not applicable AF= acre-feet CSA = County Service Area NCMA = Northern Cities Management Area
OCSD = Oceano Community Services District
Source: SLOFCWCD Zone 3 Monthly Operations Reports
4.1.2 State Water Project
Pismo Beach and OCSD have contracts with SLOFCWCD Zone 3 to receive water from the SWP. The SLOFCWCD
serves as the SWP contractor and provides imported water to local retailers through the SWP Coastal Branch
(Coastal Branch) pipeline. Pismo Beach and OCSD, as subcontractors to SLOFCWCD, have annual contractual
water delivery allocations, commonly referred to as Table A water, of 1,240 23 AFY and 750 AFY, respectively
(Table 6, below). In addition to its Table A allocation, Pismo Beach holds 1,240 AFY of additional allocation
known as “drought buffer” and OCSD holds an additional allocation of 750 AFY of drought buffer. The
additional drought buffer allocation held by the agencies is available to augment the SWP water supply when
the SWP annual allocation, i.e., percentage of SWP water available, is less than 100 percent. The additional
allocations also increase each agency’s water held in storage. In any given year; however, the SWP contracts
held by Pismo Beach and OCSD are only guaranteed for up to 1,240 AF and 750 AF, respectively.24 On
23 100 AF of this 1,240 AF was previously owned by a private party. However, as of October 2022 the 100 AF has been re-
retained by City of Pismo Beach with 20 AF being reserved for the private party.
24 If excess water is available and there is capacity in the pipeline the SWP contracts between SLOFCWCD Zone 3 and Pismo
Beach or OCSD do not prevent annual deliveries in excess of 1,240 AF or 750 AF, respectively (personal communication with
David Spiegel, SLOFCWCD, on February 3, 2022).
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November 15, 2022, the Pismo Beach City Council directed staff to work with the SLOFCWCD to increase the
Pismo Beach SWP drought buffer to 3,192 AFY and in April 2023 the OCSD Board of Directors directed staff
to increase the OCSD SWP drought bugger to 1,150 AFY. Both of these drought buffer increases are still
pending as of the date of this report.
As a result of the recent contract changes, the Zone 3 contractors are now able to store unused allocated SWP
water locally in Lopez Reservoir for later use (Stored SWP25 water). Because there is no direct physical
connection between Lopez Reservoir and the SWP, no actual SWP water would physically be in the reservoir.
Rather, the exchange would be an in-lieu exchange that occurs on paper through the water accounting
process. In 2023 all Stored SWP water was lost because of the prolonged spill event that occurred from March
through June 2023.
Table 6. NCMA SWP Table A Allocations, Drought Buffers, Stored Water and 2023 Deliveries
Agency
Table A
Allocation
(AFY)
Drought
Buffer
(AFY)
Stored SWP
Water
(AF)
2023
Delivery
(AF)
Arroyo Grande — — — —
Grover Beach — — — —
Pismo Beach 1,240 1,240 0 1,037
OCSD 750 750 0 176
Total Allocation/Usage,
AFY 1,970 1,990 0 1,213
Notes
— = not applicable AF=acre feet AFY= acre-feet per year NCMA = Northern Cities Management Area
OCSD = Oceano Community Services District SWP = California State Water Project
The SWP annual allocation for all contractors throughout California (including SLOFCWCD, Pismo Beach and
OCSD) for 2023 was initially set on December 1, 2022, at 5 percent of Table A contractual allocation amounts
The 2023 SWP allocation was then increased to 30 percent on January 26, 2023, and again to 35 percent on
February 22, and again to 75 percent on March 24, and finally to 100 percent on April 20, 2023 (for the first
time since 2006). SWP contractors can store undelivered Table A water at the SWP facility in San Luis
Reservoir (limitations exist on the amount that can be stored in any one year). This stored water is called
“carryover water” and can be delivered in subsequent years, but total annual deliveries cannot exceed their
Table A allocation due to capacity restrictions in the Coastal Branch. In addition, carryover water can be lost
(or “spilled”) if its storage interferes with storage of current-year SWP water for project needs.
The SWP supply has the potential to be affected by drought and environmental issues, particularly because of
the endangered Delta smelt in the Sacramento-San Joaquin Delta (Delta). However, OCSD and Pismo Beach
as well as the other SLOFCWCD subcontractors have not been negatively affected to date by reduced SWP
supplies because of the SLOFCWCD’s large amount of unsubscribed Table A allocation which has been used
to fulfill subcontractors’ requests, even in dry years. Therefore, even when SWP supplies are decreased, the
SLOFCWCD’s unsubscribed allocation and any carryover water in San Luis Reservoir provides a buffer so that
contracted volumes to subcontractors such as OCSD and Pismo Beach may still be provided in full. During
2023, Pismo Beach took delivery of 1,037 AF of SWP water and OCSD took delivery of 176 AF of SWP water.
25 Not to be confused with SWP “carryover water” stored in San Luis Reservoir.
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4.1.3 Groundwater
The 2008 Judgment and the 2002 Settlement Agreement govern the use of groundwater in the NCMA and
establish that groundwater will continue to be allotted and independently managed by the NCMA agencies,
NCMA overlying owners, and SLOFCWCD (collectively known as the Northern Parties). Each of the NCMA
agencies has the capability to extract groundwater from municipal water supply wells located in the central
and northern portions of the NCMA (Figure 24, on page 61, below). Groundwater also satisfies agricultural
irrigation and rural domestic use throughout the NCMA.
The calculated, consensus safe yield value of 9,500 AFY for the NCMA portion of the SMRVGB was formalized
in the 2002 Settlement Agreement through affirmation of the 2002 Groundwater Management Agreement
among the NCMA agencies. The basis of the safe yield was established in 1982 by a Technical Advisory
Committee (TAC), consisting of representatives from Arroyo Grande, Grover Beach, Pismo Beach, OCSD, Avila
Beach Community Water District, Port San Luis Harbor District, the Farm Bureau, and the County to deal with
a safe yield allocation strategy and agreement not to exceed the safe yield of what was then called the Arroyo
Grande Groundwater Basin. The basis for the committee’s analysis was DWR (1979). The TAC concluded that
the safe yield was 9,500 AFY. These findings and the allocation of the safe yield were incorporated into a
groundwater management plan (1983 Gentlemen’s Agreement and 2002 Groundwater Management
Agreement) and further formalized in the 2002 Settlement Agreement and the 2005 Stipulation.
The 9,500 AFY safe yield provides allotments for agricultural irrigation of 5,300 AFY, subsurface outflow to the
ocean of 200 AFY, and urban use entitlement of 4,000 AFY. The volume of the entitlement for urban use was
subdivided as follows:
Arroyo Grande: 1,202 AFY
Grover Beach: 1,198 AFY
Pismo Beach: 700 AFY
OCSD: 900 AFY
Page 169 of 306
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FIGURE 24
Northern Cities Management AreaSan Luis Obispo County, California
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The safe yield allotment for agricultural irrigation is significantly higher than the actual historical agricultural
irrigation demand and the calculated amount for subsurface outflow is unreasonably low. Todd (2007)
recognized that maintaining sufficient subsurface outflow to the coast and preservation of a westward
groundwater gradient is essential to preventing seawater intrusion. A regional outflow of 3,000 AFY was
estimated as a reasonable approximation (Todd, 2007) although the minimum subsurface outflow necessary
to prevent seawater intrusion is unknown. The Phase 1C model (see Section 1.7.3, above) may be utilized in
the future to further evaluate regional subsurface outflow to the ocean.
The 2002 Groundwater Management Agreement provides that groundwater entitlements of each of the urban
agencies can be increased when land within the corporate boundaries is converted from agricultural use to
urban use, which is referred to as an agricultural conversion credit. Agricultural conversion credits equal to
121 AFY and 209 AFY were developed in 2011 for Arroyo Grande and Grover Beach, respectively. These
agricultural credits were unchanged during 2023.
Total groundwater production in the NCMA, including agricultural irrigation and rural uses, is shown in
Table 7, below (descriptions of agricultural irrigation applied water and rural use estimation are provided in
Sections 4.2.1 and 4.2.2, both below, respectively). The total estimated groundwater pumpage in 2023 from
the NCMA portion of the SMRVGB was 2,697 AF.
Table 7. NCMA Groundwater Entitlement and Production from Santa Maria River Valley Groundwater
Basin, 2023
Total Entitlement/Use
Groundwater Entitlement + Ag
Conversion Credit
(AF)
2023 Groundwater
Use from SMRVGB
(AF)
Total Urban Groundwater Entitlement /Use 4,000 + 330 = 4,330 534
Total NCMA Groundwater Entitlement /Use 9,500 2,697
Notes
AF= acre-feet Ag = agriculture NCMA = Northern Cities Management Area
SMRVGB = Santa Maria River Valley Groundwater Basin
4.1.4 Developed Water
The 2005 Stipulation states that “developed water” is “groundwater derived from human intervention” and
states that this includes infiltration from the following sources: “Lopez Lake water, return flow, and recharge
resulting from storm water percolation ponds.” Return flow results from deep percolation of water used in
irrigation that is more than the requirement of the plant. Return flows have not been estimated recently but
would be considered part of the groundwater basin inflow.
In 2008, Arroyo Grande, Grover Beach, and Pismo Beach prepared stormwater management plans. To control
stormwater runoff and to increase groundwater recharge, each city now requires that new development
construct onsite retention or detention ponds. As these new ponds or basins are constructed, the increase in
groundwater recharge could result in recognition of substantial augmentation of basin yield and provision of
recharge credits to one or more of the NCMA agencies (Todd, 2007). Thus, a re-evaluation of estimated
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stormwater recharge is warranted as new recharge facilities are installed and as additional information on
flow rates, pond size, infiltration rates, and tributary watershed area becomes available.
4.1.5 Other Supplies
Arroyo Grande owns three water wells that are located outside the SMRVGB and pump groundwater from the
Pismo Formation. Two of the wells are pumped by the City and used for municipal consumption; the third well
is likely to be used in the future. There is no established entitlement that limits the volume of groundwater
that Arroyo Grande can pump from these wells, but for planning purposes the City assumes that they can
pump up to 160 AFY for municipal use. The volume that Arroyo Grande pumps from these wells varies from
year to year and is included in summary totals for urban water use, but the volume is not included in the
summary totals for SMRVGB production.
4.1.6 Total Water Supply Availability
The baseline, or full entitlement, water supply available to the NCMA agencies is summarized in Table 8, below.
The baseline water supplies include 100 percent Lopez Lake entitlement, SMRVGB groundwater entitlements,
agricultural credits, and 100 percent delivery of SWP allocations. This baseline water supply does not include
Lopez Lake Surplus or Stored water, or SWP carryover or Stored SWP water, because these supplies vary from
year to year and are not always available. The category “Other Supplies” includes groundwater pumped from
outside the NCMA boundaries (outside the SMRVGB). The baseline supply for the NCMA agencies totals
10,765 AFY.
Table 8. Baseline (Full Entitlement) Available Urban Water Supplies (AFY)
Agency Lopez
Lake
SWP Allocation
(at 100%)
Groundwater
Entitlement Ag Credit Other
Supplies Total
City of Arroyo
Grande 2,290 0 1,202 121 160 3,773
City of Grover Beach 800 0 1,198 209 0 2,207
City of Pismo Beach 892 1,240 700 0 0 2,832
OCSD 303 750 900 0 0 1,953
Total 4,285 1,890 4,000 330 160 10,765
Notes
AFY= acre-feet per year Ag = agriculture OCSD = Oceano Community Services District SWP = California State Water Project
Table 9, below, summarizes the available water supply to the NCMA agencies in 2023, including Lopez Lake
Entitlement, Surplus and Stored water, the 2023 SWP 100 percent Table A delivery schedule, available SWP
carryover water, and available Stored SWP water. The total available water (TAW) supply is a compilation of all
components of each agency’s portfolio.
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Table 9. Available Urban Water Supply, 2023 (AF)
Agency Lopez Lake
Entitlement
Lopez
Lake
Surplus
Lopez
Lake
Stored
2023 SWP
Allocation with
Drought Buffer
(at 100%
Delivery)
SWP
Carryover
Stored
SWP
Ground-
water
Entitlement
Ag
Credit
Other
Supplies
Total
(2023)
Arroyo
Grande 2,290 0 0 0 0 0 1,202 121 160 3,773
Grover
Beach 800 0 0 0 0 0 1,198 209 0 2,207
Pismo
Beach 892 0 0 2,480 1 0 2 0 700 0 0 2,832 1
OCSD 303 0 0 1,500 1 595 2 0 900 0 0 1,953 1
Total 4,285 0 0 3,880 595 0 4,000 330 160 10,765
Notes
All units in acre-feet (AF).
1 In years when the Table A SWP allocation, plus drought buffer, plus carryover exceed 1,240 AF for Pismo Beach and 750 AF for OCSD, the total contract guaranteed SWP supply is
capped at 1,240 AF for Pismo Beach and 750 AF for OCSD. However, if excess water is available and there is capacity in the pipeline the SWP contracts between SLOFCWCD Zone 3
and each Agency do not prevent annual deliveries in excess of these cap volumes (personal communication with David Spiegel, SLOFCWCD, on February 3, 2022).
2 Based on personal communication with Wes Thomson, SLOFCWCD, on January 23, 2024.
AF = acre-feet OCSD = Oceano Community Services District SWP = California State Water Project
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4.2 Water Use
Water use refers to the total amount of water used to satisfy the needs of all water user groups. In the NCMA,
water use predominantly serves urban production and agricultural applied water; a relatively small component
of rural domestic use, including small community water systems; and domestic, recreational, and agriculture-
related businesses.
4.2.1 Agricultural Water Supply Requirements
For the 2023 Annual Report, the applied irrigation demand estimations were updated using the 2015
Integrated Water Flow Model (IWFM) Demand Calculator (IDC). The IDC is a stand-alone program that
simulates land surface and root zone flow processes, and, importantly for this report, the agricultural water
supply requirements for each crop type. IDC applies user-specified soil, weather, and land-use data to estimate
and track the soil moisture balances. More specifically, available water within the root zone is tracked for each
of the crops to simulate when irrigation events take place based on crop requirements and cultural irrigation
practices. The data used in the IDC program for NCMA along with their respective sources are described below:
Land-use Information. The San Luis Obispo County Agricultural Commissioner’s Office compiles an annual
estimate of irrigated acres in the County. A view displaying the irrigated agricultural lands within NCMA for
2023 is shown in Figure 25, on page 66, below. The 2023 survey indicates a total of 1,457 acres of
irrigated agriculture in the NCMA consisting predominantly of rotational crops. Table 10, below, lists the
crop types and acreages found in the NCMA that were used in the IDC program.
Climate Data. The 2023 weather data from the SLOFCWCD rain gauge in Oceano and the CIMIS Nipomo
Station were used for precipitation and data related to reference ET values, respectively. The data needed
to calculate reference ET values include solar radiation, humidity, air temperature, and wind speed. Both
weather stations are shown in Figure 6, on page 21, above.
ET Values by Crop Category. The DWR Consumptive Use Program (CUP) was used to estimate potential ET
values based on specific annual climate data and crop type. The CUP used monthly climate data from the
closest CIMIS station (Nipomo station) and includes crop coefficients to calculate ET values for the
irrigated crop categories.
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ARROYOGRANDEGROVERBEACH
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Date: January 25, 2024 Data Sources: NCMA, ESRI, USGS, Maxar Imagery (2020)
LEGEND
Avocado
Rotational Crops
Strawberry
All Other Features
Highway
Watercourse
Northern Cities Management Area
NCMA Agricultural Land 2023
FIGURE 25
Northern Cities Management AreaSan Luis Obispo County, California
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Assumptions used in the analysis include the following:
As the NCMA is located near the coast, agricultural practices are influenced significantly by the marine
layer, a mass of air that may be of lower temperature and have higher humidity than air over inland areas.
As seen in Figure 6, on page 21, above, the Nipomo CIMIS station used for climatological data in both the
CUP and IDC is located farther inland than the easternmost boundary of NCMA and the recorded weather
data does not fully account for the cooling and moisture effects of the marine layer.
Use of an unadjusted calculated ET value results in a higher ET value than is actually taking place in the
NCMA. Studies 26 have identified that ET values within the influence of the marine layer can be as much
as 20 to 25 percent lower than ET values for the same crop located just outside of the marine layer
influence. The distance the marine layer extends inland can vary from less than one-half mile to as much
as 4 to 5 miles, depending on land topography. Low-lying areas have a higher frequency of marine layer
coverage and for longer periods throughout the day.
The NCMA is considered a low-lying area with boundaries extending between 2 and 5 miles inland.
Recognizing that not all the crops would be affected by the marine layer but accounting for the cooling
influence over some of the area, monthly ET values calculated based on the CIMIS Nipomo Station data
were adjusted lower by 12 percent27 and are shown in Table 10, below.
Soil Data. The Natural Resources Conservation Service Soil Survey Geographic Database was used to
collect soil parameters in the NCMA for use in the IDC. The soil properties used include saturated hydraulic
conductivity, porosity, and the runoff curve numbers. The field capacity and wilting points were developed
on the basis of the described soil textures (i.e., sand, loam, sandy clay) and industry standards. The IDC
relies on soil properties for estimating water storage, deep percolation, and runoff; all of which lead to a
refined estimation of applied water.
Table 10. NCMA Crop Acreages and Calculated Evapotranspiration, 2023
Crop Type Acreage 2023 Potential ET1
(AF/Acre)
Rotational Crops 1,240 1.8 2
Strawberries 175 1.5
Avocados 42 2.0
Notes
1 See ET Values by Crop Category, in text section above.
2 Rotational crop ET is based on a rotation of two to three crops.
AF = acre-feet ET = evapotranspiration NCMA = Northern Cities Management Area
26 Irrigation Training and Research Center <http://www.itrc.org/etdata/etmain.htm> (Cal Poly, 2019) provides typical-year
(1997 Hydrology) ET values using various irrigation methods for Zone 3, the coastal outside marine layer; and Zone 1, the
marine layer. The computed percentage reduction in ET to Zone 3 values range from 11 percent for rotational crops (small
vegetables) to 19 percent for strawberries.
27 A single ET reduction value is used based on changing location and rotation of crop types relative to influence of marine
layer.
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Model Development and Computations
The IDC is written in FORTRAN 2003 using an object-oriented programming approach. The program consists
of three main components: (1) input data files, (2) output data files, and (3) the numerical engine that reads
data from input files, computes applied water demands, routes water through the root zone, and exports the
results to the output files. The flow terms used in the root zone routing are defined in Table 11, below, and
shown in the graphic below the table. Drainage from ponded areas (Dr) was not applicable because there are
no ponded crops in the NCMA; data related to generic soil moisture (G) were not available.
Table 11. Flow Terms Used in Root Zone Routing for IDC Model
Abbreviation Term Notes
P Precipitation User Specified
ET Evapotranspiration IDC Output
G Generic source of moisture (i.e., fog, dew) Data Not Available
Aw Applied water IDC Output
Dr Outflow resulting from drainage of ponded
areas (e.g., rice, refuges) Not Applicable
RP Direct runoff IDC Output
Rf Return flow User Specified (fraction of applied water)
U Re-used portion of return flow User Specified (fraction of return flow)
D Deep percolation IDC Output
Note
Integrated Water Flow Model (IWFM) Demand Calculator (IDC) (DWR, 2016)
Source: DWR (2016).
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All extracted geospatial information was applied to a computational grid within the IDC framework to simulate
the root zone moisture for 2023 in NCMA agricultural areas. The IDC provides the total water supply
requirement for each crop category met through rainfall and applied irrigation water in agricultural areas based
on user-defined parameters for crop evaporation and transpiration requirements, climate conditions, soil
properties, and agricultural management practices. The sources for data related to crop demands
(i.e., potential ET), climate conditions, and soil properties are discussed above. The computations for actual
crop ET (versus potential ET), applied water, and deep percolation are described below.
The potential ET is the amount of water a given crop will consume through evaporation and/or transpiration
under ideal conditions (i.e., fully irrigated 100 percent of the time). Fully irrigated conditions mean that the
water required to meet all crop demands is available. Water is available to the crops when the soil moisture
content within the root zone is between the field capacity and the wilting point. When the soil moisture is above
the field capacity, some water will go to runoff and/or deep percolation; when the soil moisture is below the
wilting point, it is contained in the smallest pore spaces within the root zone and considered unavailable to
the crops.
The difference between the field capacity and the wilting point is the TAW. In IDC, when the soil moisture is
above one-half of the TAW, the crop ET will be equal to the potential ET. However, if the soil moisture is below
one-half of the TAW, the plants will experience water stress and ET decreases linearly until it reaches zero at
the wilting point. This method of simulating water stress is similar to the method described in Allen et al.
(1998) to compute non-standard crop ET under water stress conditions.
The IDC monitors the moisture content within the root zone and applies water by triggering an Irrigation event
when the calculated soil moisture is below a user-specified minimum allowable soil moisture requirement. For
this application of the IDC, the minimum soil moisture requirement was set to trigger an irrigation event when
the soil moisture fell below one-half the TAW to limit water stress in the crops. During an irrigation event, the
soil moisture content in the root zone reaches field capacity. If precipitation occurs, soil moisture may increase
above field capacity, generating deep percolation and potentially runoff, both depending on the quantity and
temporal distribution of rainfall.
Deep percolation is the vertical movement of water through the soil column flowing out of the root zone
resulting in the potential for groundwater recharge. The IDC applies the van Genuchten-Mualem equation
(Mualem, 1976; van Genuchten, 1985) to compute deep percolation using the user-defined saturated
hydraulic conductivity and pore size distribution.
Results
The total agricultural water supply requirements for 2023 was estimated to be 2,045 AF, and the effective
precipitation (i.e., rainwater used by the crop) was 680 AF. Notably, the effective precipitation for this period
is significantly higher compared to previous years. This increase is largely due to high soil moisture levels, a
consequence of the substantial rainfall received in recent months. The high precipitation, especially in March,
contributed significantly to these elevated soil moisture levels. This, in turn, has been instrumental in meeting
a portion of the crops' water demand through natural rainfall, thus leading to an increase in effective
precipitation. Figure 26, on page 71, below, illustrates the estimated crop water requirement in the NCMA as
calculated by the IDC and displays the three identified crop types and their estimated monthly applied water.
The rotational crops have the highest water supply requirements because they cover the greatest area (see
Figure 25, on page 66, above) and have the greatest annual ET (Table 12, below).
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The estimated agricultural water supply requirement of 2,045 AF in 2023 is substantially lower than the
estimated 2,563 AF in 2022. In 2014, the methodology of estimating agricultural water requirements was
modified from an estimated applied rate based on hydrologic conditions to the IWFM IDC methodology
described here.
The Irrigation Efficiency for 2023 was estimated as the sum of the ET of applied water over the sum of applied
water. The overall irrigation efficiency for the area is 82 percent.
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FIGURE 26.
2023 ESTIMATED AGRICULTURAL WATER DEMAND AND MONTHLY PRECIPITATION AT THE SLO NO. 795 GAUGE
Northern Cities Management Area
San Luis Obispo County, California
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Table 12. IDC Model Results of Monthly Applied Water, 2023
Monthly Applied Water (AF)
Annual Total (AF)
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Rotational Crops -- -- -- 124 382 286 314 324 346 4 47 -- 1,828
Strawberries -- -- -- -- 4 39 30 45 36 22 -- -- 176
Avocados -- -- -- -- -- 3 7 10 9 5 7 -- 41
Total 0 0 0 124 386 329 351 379 391 32 54 0 2,045
Monthly Precipitation (inches) Annual Total
(inches) Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Precipitation 6.34 4.14 6.48 0.03 0.51 0.41 0.01 0.05 0.14 0.02 1.13 4.49 23.75
Monthly Unit Water Demand (AF/Acre) Annual Total
(AF/acre) Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Rotational Crops --- --- 0.00 0.10 0.31 0.23 0.25 0.26 0.28 0.00 0.04 --- 1.48
Strawberries --- --- --- --- 0.02 0.22 0.17 0.26 0.21 0.13 --- --- 1.01
Avocados --- --- --- --- --- 0.08 0.17 0.23 0.21 0.12 0.16 --- 0.97
Area Weighted Average 0.00 0.00 0.00 0.08 0.27 0.23 0.24 0.26 0.27 0.02 0.04 0.00 1.41
Notes
— = not applicable AF = acre-feet AF/acre = acre-feet per acre
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4.2.2 Rural Use
In the NCMA, rural water use refers to groundwater pumping not designated as urban use or agricultural
irrigation applied water and includes small community water systems, individual domestic water systems,
recreational uses, and agriculture-related business systems. Small community water systems using
groundwater in the NCMA were identified initially through a review of a list of water purveyors compiled in the
2007 County IRWMP. These include the Halcyon Water System, Ken Mar Gardens, and Pacific Dunes RV
Resort. The Halcyon Water System serves 35 homes in the community of Halcyon, and Ken Mar Gardens
provides water supply to 48 mobile homes on South Halcyon Road. The Pacific Dunes RV Resort, with 215 RV
sites, provides water supply to a largely transitory population and a nearby riding stable. In addition, an
inspection of aerial photographs of rural areas within NCMA has identified about 25 homes and businesses
that are served by private wells. Two mobile home communities, Grande Mobile and Halcyon Estates, are
served by OCSD through the distribution system of Arroyo Grande. Therefore, the production summary of OCSD
includes these two communities. Based on prior reports, it is assumed that the number of private wells is
negligible within the service areas of the NCMA agencies.
The Pismo Beach Golf Course uses an onsite water well for turf irrigation. The pumped water is not metered,
and the golf course operators do not know the total water use. An estimate of water demand for the golf course
is based on the irrigated acreage, sandy soils, near-ocean climate, and water duty factors from the U.S. Golf
Association, Alliance for Water Efficiency, U.S. Golf Courses Organization of America, and several other
sources. The estimated rural water demand is provided in Table 13, below.
Table 13. Estimated Rural Water Production, 2023
Groundwater User No. of Units
Estimated Water
Production,
AFY per Unit
Estimated Annual
Water Production
(AF)
Notes
Halcyon Water System 35 0.4 14 1
Ken Mar Gardens 48 — 5 2
Pacific Dunes RV Resort 215 0.03 6 3
Pismo Beach Golf Course — — 45 4
Rural Users 25 0.4 10 1
Current Estimated Rural Production 80 —
Notes
1.Rural residential water use is assumed to include minor outdoor irrigation and is estimated at 0.4 AFY per unit.
2.Demand based on metered water usage.
3.Water use/unit assumes 50 percent annual occupancy and 0.06 AFY per occupied site.
4.Estimated golf course demand, based on estimated water duty factor, annual ET, and irrigated acreage.
— = not applicable AF=acre feet
AFY = acre-feet per year ET = evapotranspiration
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4.2.3 Urban Production for Potable Use
Urban water production for potable use is presented in Table 14, below, for each of the NCMA agencies from
2005 through 2022. These values reflect Lopez Lake deliveries, SWP deliveries, groundwater production data,
and system losses, and represent all water used within the service areas of the four NCMA agencies. In the
last 18 years, urban water production has ranged from 5,240 AF (2023) to 8,982 AF (2007). There has been
an overall decline in urban production since 2007. The long-term declining trend in production was likely
initially attributed to the relatively slow economy from 2009 through 2012, then subsequently to conservation
activities implemented by the NCMA agencies in response to drought conditions. Urban water production was
5,240 AF in 2023, the lowest level in at least the last 25 years.
Table 14. Historical Urban Water Production for Potable Use (Groundwater and Surface Water)
Year Arroyo
Grande
Grover
Beach
Pismo
Beach OCSD Total
Urban
Percentage of 2013
Production1
2005 3,460 2,082 2,142 931 8,615 —
2006 3,425 2,025 2,121 882 8,453 —
2007 3,690 2,087 2,261 944 8,982 —
2008 3,579 2,051 2,208 933 8,771 —
2009 3,315 1,941 2,039 885 8,180 —
2010 2,956 1,787 1,944 855 7,542 —
2011 2,922 1,787 1,912 852 7,473 —
2012 3,022 1,757 2,029 838 7,646 —
2013 3,111 1,792 2,148 888 7,939 —
2014 2,752 1,347 1,949 807 6,856 —
2015 2,239 1,265 1,736 703 5,943 75%
2016 1,948 1,210 1,646 672 5,476 69%
2017 2,194 1,248 1,700 718 5,860 74%
2018 2,212 1,221 1,720 725 5,878 74%
2019 2,139 1,193 1,648 680 5,660 71%
2020 2,317 1,289 1,777 743 6,126 77%
2021 2,307 1,277 1,771 718 6,073 76%
2022 1,990 1,205 1,632 644 5,471 69%
2023 1,936 1,166 1,509 629 5,240 66%
Notes
1 On April 1, 2015, California Governor Jerry Brown issued an executive order (B29-2015) mandating statewide reductions in water
use. The order directs the State Water Resources Control Board to implement mandatory water reductions in cities and towns across
California to reduce water usage by 25 percent, compared to the amount used in 2013, through February 2016.
All units in acre-feet (AF)
— = not applicable AF = acre-feet OCSD = Oceano Community Services District
4.2.4 2023 Groundwater Pumpage
Total SMRVGB groundwater production in the NCMA, including urban production, applied agricultural water
requirements, and rural pumping, is shown in Table 15, below. Total estimated SMRVGB groundwater
pumpage in the NCMA in 2023 was 2,697 AF, which represents a significant decrease from 2022 (3,523 AF).
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Table 15. NCMA Groundwater Pumpage from Santa Maria River Valley Groundwater Basin, 2023 (AF)
Agency
Groundwater
Entitlement + Ag
Conversion Credit
(AF)
2023 Groundwater
Use from SMRVGB
(AF)
Percent Pumped of
Groundwater
Entitlement
Arroyo Grande 1,202 + 121 = 1,323 69 5%
Grover Beach 1,198 + 209 = 1,407 373 27%
Pismo Beach 700 39 6%
OCSD 900 53 6%
Total Urban Groundwater
Entitlement /Use 4,000 + 330 = 4,330 534 12%
Agricultural Irrigation Applied
Water 5,300 - 330 = 4,970 2,045 41%
Non-potable Applied Irrigation
Water (Arroyo Grande) -- 38 --
Rural Water Users -- 80 --
Estimated Subsurface Outflow
to Ocean (2002 Groundwater
Management Agreement)
200 -- --
Total NCMA Groundwater
Entitlement /Use 9,500 2,697 28%
Notes
— = not applicable AF = acre-feet Ag = agriculture NCMA = Northern Cities Management Area
OCSD = Oceano Community Services District SWRVGB = Santa Maria River Valley Groundwater Basin
The total estimated groundwater pumpage of 2,697 AF in 2023 represents about 28 percent of the calculated
safe yield of 9,500 AFY for the NCMA portion of the SMRVGB.
A graphical depiction of water uses by supply source for each NCMA agency since 2000 is presented as
Figure 27, on page 76, below. The graphs depict changes in water supply availability and use over time. The
increased dependence in 2017, 2018, 2019, and 2020 on Lopez Lake is illustrated in this graphic. With
reduced access to Lopez Lake water in 2021 and 2022, OCSD and City of Pismo Beach utilized a greater
percentage of SWP water during that time. In 2023, the availability of Lopez Lake spill water during March,
April, May, and June resulted in reduced use of SWP water during that time. Although all four agencies pumped
groundwater as part of their supply portfolios in 2023, groundwater pumped from the SMRVGB constituted a
minor part of the overall water supply, an amount of 572 AF28 or 11 percent of overall urban use.
28 This total includes the 534 AF pumped by NCMA agencies and the 38 AF of non-potable irrigation production in Arroyo
Grande.
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FIGURE 27. MUNICIPAL WATER USE BY SOURCE
Northern Cities Management Area
San Luis Obispo County, California
Notes:
AFY - Acre-feet per year
SWP - California State Water Project
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As shown in Figure 28, on page 78, below, groundwater pumpage reached a peak in 2007 and then declined
in 2008, 2009, and 2010. From 2010 through 2013, pumpage increased slightly every year, but even so,
overall groundwater use remained significantly lower than previous annual pumpage rates. Annual pumping
totals have generally been on the decline since 2013. In 2023, urban potable groundwater use was 534 AF,
which is 12 percent of the 4,330 AF of combined urban groundwater entitlement and agricultural conversion
credit.
4.2.5 Changes in Water Production
Historical water use for urban uses, agricultural irrigation, and rural uses is shown in Table 16, below.
Table 16. Historical Total Water Use (Groundwater and Surface Water, AF)
Year Arroyo
Grande
Grover
Beach
Pismo
Beach OCSD Total
Urban
Agricultural
Irrigation1
Rural
Water Total Use
2005 3,460 2,082 2,142 931 8,615 2,056 36 10,707
2006 3,425 2,025 2,121 882 8,453 2,056 36 10,545
2007 3,690 2,087 2,261 944 8,982 2,742 36 11,760
2008 3,579 2,051 2,208 933 8,771 2,742 36 11,549
2009 3,315 1,941 2,039 885 8,180 2,742 36 10,958
2010 2,956 1,787 1,944 855 7,542 2,056 38 9,636
2011 2,922 1,787 1,912 852 7,473 2,742 38 10,253
2012 3,022 1,757 2,029 838 7,646 2,742 41 10,429
2013 3,111 1,792 2,148 888 7,939 2,742 42 10,722
2014 2,752 1,347 1,949 807 6,855 2,955 38 9,848
2015 2,239 1,266 1,736 703 5,943 3,008 38 8,990
2016 1,948 1,210 1,646 672 5,476 2,551 81 8,108
2017 2,194 1,248 1,700 718 5,860 2,579 80 8,519
2018 2,212 1,221 1,720 725 5,878 2,713 81 8,672
2019 2,139 1,193 1,648 680 5,660 2,554 82 8,296
2020 2,317 1,289 1,777 743 6,126 2,369 82 8,577
2021 2,307 1,277 1,771 718 6,073 2,503 82 8,658
2022 1,990 1,205 1,632 644 5,471 2,614 80 8,165
2023 1,936 1,166 1,509 629 5,240 2,083 80 7,403
Notes
1 Irrigation applied water includes agricultural irrigation plus SMRVGB non-potable irrigation by Arroyo Grande.
AF = acre-feet OCSD = Oceano Community Services District SMRVGB = Santa Maria River Valley Groundwater Basin
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FIGURE 28. TOTAL WATER USE (URBAN, RURAL, AGRICULTURAL) BY SOURCE
Northern Cities Management Area
San Luis Obispo County, California
P:\Portland\672-Northern Cities Management Area\005-2018 Annual Report\03 Annual Report\0 Admin Draft\Figures\Parts Fig 26 NCMA Total Water Use by Source
Notes:
AFY - Acre-feet per year
SWP - California State Water Project
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In general, urban water production has ranged from 8,982 AF in 2007 (Table 16, above) to 5,240AF in 2023.
Total water use since 2007 has been on a general downward trend; this overall decline in water use can be
attributed to conservation activities implemented by the NCMA agencies in response to drought. 2023 urban
water use is the lowest on record. This may be attributed to conservation mechanisms already in place coupled
with reduced urban landscaping water demand due to above average precipitation during winter 2022/2023.
In the agricultural irrigation category, agricultural acreage has remained fairly constant. Thus, annual applied
water for agricultural irrigation varies mostly with weather conditions. Acknowledging the variability caused by
weather conditions, agricultural irrigation applied water is not expected to change significantly given the
relative stability of applied irrigation acreage and cropping patterns in the NCMA south of Arroyo Grande Creek.
Changes in rural domestic pumping have not been significant.
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SECTION 5: Comparison of Water Supply and Water Production
The Baseline Available Urban Water Supplies for each of the NCMA agencies is 10,765 AFY, assuming
100 percent delivery of SWP allocation and assuming no Lopez Lake Surplus or Stored water, or SWP carryover
or Stored SWP water (Table 8, above). In 2023, because of 100 percent delivery of SWP allocation water and
SWP carryover water, the total available urban water supply was 10,765 AF (Table 9, above).
As described in the 2002 Groundwater Management Agreement and affirmed in the 2002 Settlement
Agreement, the calculated safe yield from the NCMA portion of the SMRVGB is 9,500 AFY (Table 8, above, and
Table 15, above). Because all agricultural irrigation water use is supplied by groundwater, the total available
agricultural irrigation supply is a portion of the estimated safe yield; this portion was allocated as 5,300 AFY
for agricultural and rural use. The agricultural conversion of 330 AFY reduces this allocation to 4,970 AFY. Of
the estimated safe yield of 9,500 AFY, other than what is allocated for agricultural irrigation and rural use, the
remaining 4,330 AFY is allocated for urban water use (4,330 AFY, including 4,000 AFY groundwater allocation
plus 330 AFY in agricultural conversion credit) and an estimated 200 AFY for subsurface outflow to the ocean.
In 2023, the total estimated NCMA water production was 7,403 AF (Table 17, below). The 2023 water
production of each city and agency is shown by source in Table 17, below. Note that the production volumes
described here are gross production (if pumped groundwater) and gross deliveries (if surface water deliveries)
and equal net consumptive demand plus losses and return water.
Table 17. Water Production by Source, 2023 (AF)
Agency Lopez Lake
State
Water
Project
SMRVGB
Groundwater
Other
Supplies1 Total
Urban Area
Arroyo Grande 1,867 0 69 0 1,936
Grover Beach 793 0 373 0 1,166
Pismo Beach 433 1,037 39 0 1,509
OCSD 400 176 53 0 629
Urban Water Use
Total 3,493 1,213 534 0 5,240
Non-Urban Area
Agricultural Irrigation
Applied Water 0 0 2,045 0 2,045
Rural Water Users 0 0 80 0 80
Non-potable Applied
Irrigation Water
(Arroyo Grande)
0 0 38 0 38
Total 3,493 1,213 2,697 0 7,403
Notes
1 The category “Other Supplies” include groundwater pumped from outside the NCMA boundaries.
AF = acre-feet NCMA = Northern Cities Management Area
OCSD = Oceano Community Services District SMRVGB = Santa Maria River Valley Groundwater Basin
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As shown in Table 17, above, water for urban use in 2023 was supplied to the NCMA from 3,493 AF of Lopez
Lake water; 1,213 AF of SWP water; and 534 AF of groundwater. Arroyo Grande produced 0 AF from its Pismo
Formation wells in 2023.
Based on the calculated yield of the NCMA portion of the SMRVGB, the baseline, or full allocation, of total
available supply for all uses is 15,595 AFY, which is the sum of 10,765 AFY for urban use plus the allocation
for agricultural irrigation and rural area of 4,970 AFY. In 2023, factoring in the SWP delivery schedule and
availability of SWP carryover water, the total available supply for all uses was 10,765 AF (Table 9, above)
compared with actual 2023 NCMA water use of 7,403 AF (Table 17, above). It must be noted, however, that
this comparative review of available 2023 supply versus production must be viewed with caution because of
the potential threats to the groundwater supply (see Section 6.1, below). As described earlier, the NCMA
agencies pumped only 12 percent of their “available” groundwater entitlement. It is clear that the NCMA
agencies could not have used their entire groundwater entitlement in 2023 without significantly lowering water
elevations and offsetting the welcome gains in groundwater in storage (see Section 3.2, above).
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SECTION 6: Threats to Water Supply
Because the NCMA agencies depend on both local and imported water supplies, changes in either state-wide
or local conditions can threaten the NCMA water supply. Water supply imported from other areas of the state
may be threatened by state-wide drought, effects of climate change in the SWP source area, management and
environmental protection issues in the Delta that affect the amount and reliability of SWP deliveries, and risk
of seismic damage to the SWP delivery system. Local threats to the NCMA water supply similarly include
extended drought and climate change that may affect the yield from Lopez Lake and reduced recharge to the
NCMA. In addition, the NCMA is not hydrogeologically isolated from the NMMA and the rest of the SMRVGB,
and water supply threats in the NMMA are a potential threat to the water supply sustainability of the NCMA.
There is a potential impact from seawater intrusion if the groundwater system, including the entire SMRVGB,
is not adequately monitored and managed. In particular, management of the SMRVGB may need to account
for sea level rise and the relative change in groundwater gradient along the shoreline.
6.1 Threats to Local Groundwater Supply
6.1.1 Declining Water Levels
Before 2023, water levels in the NCMA portion of the SMRVGB exhibited an overall declining trend for many
years. Important factors for maintaining water levels are managing inflow and outflow to the aquifer.
Inflow: An important inflow component to the NCMA area is subsurface inflow into the aquifers that supply
water wells serving the NCMA. Historically, subsurface inflow to the NCMA from the Nipomo Mesa along
the southeast boundary of the NCMA has been an important component of groundwater recharge. This
inflow is reduced from historical levels, as first recognized in 2008–2009, to “something approaching no
subsurface flow” because of lower groundwater levels in the NMMA (NMMA 2nd Annual Report CY 2009,
page 43) (NMMA, 2010). This condition continues, as described in all subsequent NMMA annual reports.
Outflow: A major outflow component is groundwater pumpage. Total SMRVGB groundwater pumping in
the NCMA (urban, agricultural, and rural domestic) was 2,697 AF in 2023, which is 28 percent of the court-
accepted 9,500 AF safe yield of the NCMA portion of the SMRVGB. Even during the well above average
precipitation year in 2023, it is clear that the NCMA agencies could not have used their entire groundwater
entitlement without significantly lowering water elevations and offsetting the welcome gains in
groundwater in storage (see Section 3.2, above).
Before 2023, recent drought conditions had resulted in a generally steady decline in groundwater in storage
in the NCMA portion of the SMRVGB. Although above average precipitation received in 2023 provided
significant recharge to the basin, the estimated 3,610 AF increase in groundwater in storage is only
approximately equivalent to a single year’s worth of total NCMA groundwater pumping (based on pumping
totals since 2010). It is therefore apparent that even a single year of minimal groundwater recharge could
return the NCMA to a state of declining groundwater levels, which could easily be exacerbated if the NCMA
agencies are required to increase groundwater withdrawals because of a reduction or total loss in local surface
water supplies or SWP deliveries.
6.1.2 Seawater Intrusion
The NCMA is underlain by an accumulation of alluvial materials that slope gently offshore and extend for many
miles under the ocean (DWR, 1970, 1975). Coarser materials within the alluvial materials comprise aquifer
zones that receive freshwater recharge in areas above sea level. If sufficient outflow from the aquifer occurs,
the dynamic interface between seawater and fresh water will be prevented from moving onshore. Sufficient
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differential pressure to maintain a net outflow is indicated by onshore groundwater elevations that are above
mean sea level and establish a seaward gradient to maintain that outflow.
The 2008 NCMA Annual Report documented that a portion of the aquifer underlying the NCMA exhibited water
surface elevations below 0.0 NAVD 88 (NCMA, 2008). Hydrographs for NCMA sentry wells and the Deep Well
Index (Figures 11 through 15, on pages 32 through 37, above) show that coastal groundwater elevations were
at relatively low levels for as long as 2 years during that time. Such sustained low levels had not occurred
previously in the historical record and reflected the impact of drought on groundwater levels. The low coastal
groundwater levels indicated a potential for seawater intrusion.
Elevated concentrations of TDS, chloride, and sodium were observed in wells 30N03 and 30N02 beginning in
May 2009, indicating incipient seawater intrusion (Figure 29, on page 85, below, and Figure 30, on page 86,
below). OCSD MW-Blue also showed elevated concentrations of TDS and chlorides, but a concurrent decline
in sodium (Figure 30, on page 86, below). Concentrations of TDS, chloride, and sodium recovered to historical
levels in wells 30N03 and 30N02 (one of the sentry wells comprising the Deep Well Index) by April 2010.
Comparing well 30N02 to the other Deep Well Index wells, the other Deep Well Index wells showed no elevated
concentrations during the same period. However, comparing well 30N02 to wells with similar screen
elevations (Figure 4, on page 15, above), wells 36L01 (approximately 12,000 feet south of well 30N02) and
the OCSD MW-Blue well, approximately 3,300 feet east-southeast of well 30N02, suggested that seawater
intrusion perhaps progressed eastward as far as the OCSD MW-Blue well, but not as far south as well 36L01
(Figure 30, on page 86, below). While the TDS and chloride concentrations were elevated from August 2009
to July 2011 in the OCSD MW-Blue well, the sodium concentrations remained within historical levels. During
the same period, TDS, chloride, and sodium concentrations remained relatively stable in well 36L01.
During 2023, there were no indications of seawater intrusion.
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FIGURE 29. HISTORICAL TDS, CHLORIDE AND SODIUM, INDEX WELLS AND 30N03Northern Cities Management AreaSan Luis Obispo County, California1965 1970 1975 1980 1985 1990 1995 2000 2005 2010 2015 202005001,0001,5002,0002,500TDS, mg/L020406080100120140160180200Chloride, mg/L04080120160200240280Sodium, mg/LP:\Portland\672-Northern Cities Management Area\_Grapher Figures\Annual Rpt Figs Fig 29 NCMA TDS, Cl and Sodium Index Wells and 30N0330N02 Chloride>600 mg/lin 2009Notes:TDS - total dissolved solidsmg/L - milligrams per liter85 Page 194 of 306
FIGURE 30. HISTORICAL TDS, CHLORIDE AND SODIUM, WELLS 30N02, MW-BLUE AND 36L01Northern Cities Management AreaSan Luis Obispo County, California1965 1970 1975 1980 1985 1990 1995 2000 2005 2010 2015 202005001,0001,5002,0002,500TDS, mg/L020406080100120140160180200Chloride, mg/L04080120160200240280Sodium, mg/LWell 30N02 (Paso Robles Formation)Well 31H11 (Blue; Paso Robles Formation)Well 36L01 (Paso Robles Formation)P:\Portland\672-Northern Cities Management Area\_Grapher Figures\Annual Rpt Figs Fig 30 NCMA TDS, Cl and Sodium Wells 30N02 MW-Blue and 36L01_v2Notes:TDS - total dissolved solidsmg/L - milligrams per liter31H11 Chloride1,000 mg/lin 200986 Page 195 of 306
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Measures to Avoid Seawater Intrusion
In recognition of the risk of seawater intrusion, the NCMA agencies have developed and implemented a water
quality monitoring program for the sentry wells and OCSD observation wells. The NCMA agencies and
SLOFCWCD have worked cooperatively toward the protection of the sentry wells as long-term monitoring sites.
Several measures are employed by the NCMA agencies to reduce the potential for seawater intrusion.
Specifically, the NCMA agencies have voluntarily reduced coastal groundwater pumping; decreased overall
water use via conservation; and initiated plans, studies, and institutional arrangements to secure additional
surface water supplies. As a result, each of the four major municipal water users in the NCMA reduced
groundwater use between 25 and 95 percent during the past several years. In 2023, potable municipal
groundwater use was 534 AF, which constitutes 12 percent of the urban users’ groundwater entitlement
(including agricultural conversion credits) of the safe yield (Table 7, above).
According to the DWR Bulletin 63-3 report (DWR, 1970) both the Paso Robles Formation aquifer and the lower
confined portion of the Cienega Valley alluvial aquifer are recharged primarily from subsurface groundwater
inflow from the east, where the overlying confining layers are thin to nonexistent (DWR, 1970). These recharge
areas to the east include inland reaches of Arroyo Grande Valley and portions of Nipomo Mesa (DWR, 1970).
Any action that results in reduced groundwater recharge, whether it is from drought or reduction of subsurface
inflow from the north and east, reduces overall recharge to the groundwater basin, lowers the gradient (or
head) of the groundwater near the shoreline, and reduces subsurface outflow to the ocean, thereby increasing
the potential threat of seawater intrusion. Alternatively, any action that results in increased groundwater
recharge lessens the threat of seawater intrusion.
A major initiative that will provide significant protection to the threat of seawater intrusion is the development
of Central Coast Blue. Central Coast Blue is a regional recycled water project that includes advanced treatment
of water from the wastewater treatment plants of Pismo Beach and SSLOCSD and injection into the NCMA
portion of the SMRVGB. Injection of the highly purified effluent will reduce the threat of seawater intrusion and
improve water supply sustainability for the region. Tasks related to the development of the project that were
performed before 2023 included preliminary design, pilot plant operation and data collection, test injection
and monitoring well construction, supplemental geophysics investigation, groundwater modeling,
environmental review, and the beginning stages of final design and permitting. Major project milestones that
occurred in 2023 included progression of the final design, adoption of an Environmental Impact Report
Addendum, development of grant and low-interest loan applications, notice of award of an additional
$23 million in project grant funding, startup of the Central Coast Blue Regional Recycled Water Authority, and
dozens of presentations given to the community to provide information about the project.
In 2020 the Nipomo Community Services District (NCSD) asked the NCMA agencies for a letter in support of
an appeal to the Santa Barbara County Board of Supervisors to remove the 3,000 AFY volume limitation in the
NCSD waterline intertie license agreement. NCSD has designed and constructed a pipeline for the Nipomo
Supplemental Water 29 project (Supplemental Water Project) that is sized to accommodate the delivery of
6,200 AFY as provided for in the Stipulation and Judgment. It is NCSD’s contention that the 3,000 AFY
limitation in the license agreement is arbitrary, serves no purpose, and is in violation of Santa Barbara County’s
obligations under the Stipulation and Judgment to support, and not oppose, implementation of the
29 As described in Section VI.A of the Stipulation; “The NCSD agrees to purchase and transmit to the [Nipomo Mesa
Management Area] (NMMA) a minimum of 2,500 acre-feet of Nipomo Supplemental Water each Year. However, the NMMA
Technical Group may require NCSD in any given Year to purchase and transmit to the NMMA an amount in excess of 2,500
acre-feet and up to the maximum amount of Nipomo Supplemental Water which the NCSD is entitled to receive under the
MOU if the Technical Group concludes that such an amount is necessary to protect or sustain Groundwater supplies in the
NMMA.”
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Adjudication, including development of the Supplemental Water Project. Further, the limitation threatens the
long-term sustainability of the entire Basin. Completion of the Supplemental Water Project is intended to
reduce groundwater pumping, increase subsurface inflow from Nipomo Mesa to the NCMA, and help protect
the groundwater resource from seawater intrusion. The NCMA agencies supplied the requested letter of
support to NCSD on February 19, 2021.
6.2 Threats to State Water Project Supply
Both extended drought and long-term reduction in snowpack from climate change can affect SWP deliveries.
The storage capacity levels of the state’s two largest reservoirs, Lake Shasta and Lake Oroville, were 34 and
37 percent capacity, respectively, as of the start of 2023. As a result of well above average precipitation during
the winter of 2022/2023, including historic snowpack in the Sierra Nevada Mountain Range (the primary
source area of the SWP) both Lake Shasta and Lake Oroville reservoirs filled to nearly 100 percent by late
spring 2023. These conditions allowed 100 percent fulfillment of Table A allocations for the first time since
2006.
Leading into 2023, rainfall totaled nearly 7 inches in December 2022 as recorded at the County-operated
gauge (No. SLO 795). Although the calendar year rainfall total at the No. SLO 795 station for 2023 (23.75
inches) is only the 11th highest since 1950, this belies the magnitude of the above average rainfall received
in contributing watersheds and groundwater recharge areas to the east of the NCMA during winter
2022/2023. Rainfall received during 2023 at County monitored stations Arroyo Grande Creek (No. SLO 739)
and Lopez Dam (No. SLO 737) were 28.6 and 40.3 inches, respectively. Before 2023, the last 100 percent
SWP allocation—difficult to achieve even in wet years largely because of Delta pumping restrictions to protect
threatened and endangered fish species—occurred in 2006.
The immediate threat of allocation reductions to Pismo Beach and OCSD, the only SWP subcontractors in the
NCMA, has not significantly materialized during the past several years. The SLOFCWCD’s large amount of
unsubscribed Table A allocation provides a buffer, in addition to the agency’s drought buffer, so that
contracted volumes to SWP subcontractors, such as the OCSD and Pismo Beach, still may be provided in full.
However, the SWP supply has the potential to be affected by drought as well as environmental issues,
particularly involving the Delta smelt.
6.3 Threats to Lopez Lake Water Supply
Despite the filling and subsequent spilling of Lopez Lake reservoir in 2023, recent extended drought
conditions contributed to recent record low water levels in Lopez Lake. As discussed in Section 4.1.1, above,
the Zone 3 agencies developed and implemented the LRRP in response to reduced water in storage in the
lake in recent years. The LRRP is intended to reduce municipal diversions and downstream releases as water
levels drop to preserve water within the reservoir for an extended drought. Water from Lopez Lake may be
significantly reduced or unavailable to the Zone 3 agencies in the event of prolonged future drought. Without
access to water from Lopez Lake, the NCMA agencies and local agriculture stakeholders may be forced to rely
more heavily on their groundwater supplies and increase pumping during extended drought conditions, which
could result in lowering water levels in the aquifer and an increased threat from seawater intrusion. Moreover,
a reduction in downstream releases from the reservoir, as mandated by the LRRP, likely will lead to reduced
recharge to the NCMA portion of the SMRVGB and further contribute to declining groundwater levels.
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SECTION 7: Management Activities
The NCMA and overlying private well users have actively managed surface water and groundwater resources
in the area for more than 40 years. Management objectives and responsibilities were first established in the
1983 Gentlemen’s Agreement, recognized in the 2002 Groundwater Management Agreement, and affirmed
in the 2002 Settlement Agreement. The responsibility and authority of the Northern Parties for NCMA
groundwater management was formally established through the 2002 Settlement Agreement, 2005
Stipulation, and 2008 Judgment. Throughout the long history of collaborative management, which was
formalized through the Agreement, Stipulation, and Judgment, the overall management goal for the NCMA
agencies is to preserve the long-term integrity of water supplies in the NCMA portion of the SMRVGB.
7.1 Strategic Plan
7.1.1 Purpose and Background
An NCMA Strategic Plan was first developed in 2014 to provide the NCMA TG with a mission statement to
guide future initiatives, provide a framework for identifying and communicating water resource planning goals
and objectives, and formalize a 10-year work plan for implementation of those efforts (WSC, 2014). Several
key objectives were identified related to enhancing water supply reliability, improving water resource
management, and increasing effective public outreach. Implementation of some of these efforts continued
throughout 2023.
Work began in 2019 to update the 2014 NCMA Strategic Plan. The Strategic Plan was developed over a series
of strategic planning sessions and NCMA TG meetings and culminated with the publication of the Strategic
Plan for the NCMA TG in March 2020. The purpose of the Strategic Plan is to provide the NCMA TG with the
following:
A mission statement to guide future initiatives
A framework for communicating water resource goals
A formalized work plan for the next 10 years
7.1.2 Mission Statement
Through the strategic planning process, the NCMA TG developed the following mission statement to guide
ongoing initiatives and plan implementation and capture the requirements outlined in the 1983 Gentlemen’s
Agreement, 2005 Stipulation, and the 2008 Judgment:
Preserve and enhance the sustainability of water supplies for the Northern Cities Area by:
Enhancing supply reliability
Protecting water quality
Maintaining cost-effective water supplies
Advancing the legacy of cooperative water resources management
Promoting conjunctive use
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7.1.3 Objectives of the NCMA TG
Through the 2020 strategic planning process, the NCMA TG identified several key objectives to guide future
efforts. These objectives include the following:
A.Enhance Water Supply Reliability
Develop coordinated response plan for saltwater intrusion and other supply emergencies
Support implementation of Central Coast Blue
Prepare the Northern Cities for prolonged drought conditions
Analyze impacts of pumping on the groundwater basin
Improve protection against threats to groundwater sustainability
B.Improve Water Resource Management
Improve management/conjunctive use of water resources
Improve coordination between technical/legal/managerial initiatives
Abide by the legal/regulatory groundwater management requirements
Increase understanding of current and historical groundwater conditions to inform water resources
initiatives
C. Increase Effective Outreach
Engage agriculture stakeholders
Improve cooperation, coordination, and information sharing with local and regional agencies to
further the objectives of the NCMA agencies
Reinforce the role of the NCMA TG as the recognized technical expert for water resources within
the Northern Cities Management Area
Increase communication with City Councils and the Board of Directors
Maintain equity among all NCMA agencies
7.1.4 Strategic Initiatives and Implementation Plan
Fifteen key strategies were identified by the TG for improving the sustainability of the water resource. Strategic
initiatives were then developed for each key strategy, and an extensive screening and objective ranking
process was applied. Utilizing the ranked and grouped strategic initiatives, the NCMA TG developed an
implementation plan for the key strategies.
The implementation plan includes a ranking for each initiative, the key participants, the required actions, an
estimated budget, and an implementation time frame. The implementation time frame incorporates three
periods: a current designation that refers to initiatives that the NCMA plans to complete within 1 year, a short-
term designation that refers to initiatives that could be completed within 5 years, and a long-term designation
that refers to initiatives that are anticipated to take longer than 5 years to implement.
7.2 Management Objectives
In addition to the Strategic Plan, the NCMA TG has, over the years, established eight basic Water Management
Objectives for ongoing NCMA groundwater management. Many of these objectives were incorporated into the
Strategic Plan but are repeated here because they form the framework for long-term strategies and objectives
to effectively manage the groundwater resource. The management objectives include the following:
1. Share Groundwater Resources and Manage Pumping
2.Enhance Management of NCMA Groundwater
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3.Monitor Supply and Demand and Share Information
4.Manage Groundwater Levels and Prevent Seawater Intrusion
5.Protect Groundwater Quality
6.Manage Cooperatively
7.Encourage Water Conservation
8.Evaluate Alternative Sources of Supply
Each of these objectives is discussed in the following sections. Under each objective, the NCMA TG has
identified strategies to meet the objectives. These strategies are listed and then discussed under each of the
eight objectives listed below. Other potential objectives are outlined in the final section.
7.2.1 Share Groundwater Resources and Manage Pumping
Strategies:
Continued reduction of groundwater pumping; maintain pumping below safe yield.
Coordinated delivery of Lopez Lake water to the maximum amount available.
Continue to import SWP supplies to OCSD and Pismo Beach.
Maintain surface water delivery infrastructure to maximize capacity.
Utilize Lopez Lake to store additional SWP water within San Luis Obispo County.
Utilize newly modified Zone 3 agency contracts to store unused allocated water in Lopez Reservoir.
Discussion:
Maintain Groundwater Pumping Below Accepted Basin Yield
A longstanding objective of water users in the NCMA has been to cooperatively share and manage groundwater
resources. In 1983, the Northern Parties mutually agreed on an initial safe yield estimate and an entitlement
of pumping between the urban users and agricultural irrigation users of 57 percent and 43 percent,
respectively (see Section 4.1, above). In this agreement, the NCMA agencies also established pumping
entitlements among themselves (Section 4.1.3, above). Subsequently, the 2002 Groundwater Management
Agreement included provisions to account for changes such as agricultural land conversions. The agreements
provide that any change in the accepted safe yield based on ongoing assessments would be shared on a pro
rata basis. Pursuant to the 2005 Stipulation, the NCMA agencies conducted a water balance study to update
the safe yield estimate (Todd, 2007). As a result, the NCMA agencies agreed to maintain the existing pumping
entitlement among the urban users and established a consistent methodology to address agricultural land
use conversion.
Maximize Delivery of Lopez Lake Water and Continue Importing State Water Project Water
In addition to cooperatively sharing and managing groundwater resources, the NCMA agencies have
coordinated delivery of water from Lopez Lake. At the same time, Pismo Beach and OCSD have continued to
import SWP water. Both actions maximize use of available surface water supplies. In 2016, in response to the
ongoing drought at that time and the threat of diminishing water supplies, Arroyo Grande approved a ballot
measure authorizing the purchase of SWP water on a temporary basis and only during a declared local water
emergency. That condition was not reached in 2017 nor subsequent years, and Arroyo Grande has not
purchased SWP water to date.
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Modified Zone 3 Agency Contracts
An initiative to modify the Zone 3 agency contracts to incorporate storage provisions was started in late 2019
and continued into 2022. By the end of 2020, the conceptual contract amendments were developed, reservoir
modeling was completed, and updated contract language had been developed and reviewed by the Zone 3
TAC. In 2021, a California Environmental Quality Act review was initiated to evaluate potential impacts of the
proposed amendments. On August 11, 2022, the Zone 3 TAC voted to execute the amended and restated
water supply contracts.
These contract changes allow the Zone 3 subcontractors to store their unused annual water entitlement and
any surplus water they receive in Lopez Reservoir, as well as allow for in-lieu storage of SWP water. In other
words, each subcontractor now has a stored water account. The purpose of these changes is to provide
subcontractors greater flexibility to better manage their water supply portfolios and incentivize conservation
of water during emergencies and droughts. The changes provide the subcontractors greater flexibility to use
their water supplies conjunctively (i.e., to implement a balanced use of surface and groundwater supplies
based on hydrologic conditions) and additionally allows subcontractors to transfer stored Lopez and SWP
water amongst themselves to improve water supply availability during drought conditions and water supply
resiliency for the region.
These contract changes went into effect at the end of October 2022. Although existing Lopez Surplus water
for each contractor was converted into Lopez Stored water as a one-time deal upon contract execution, all the
Lopez Stored water and a minor amount of Stored SWP was lost because of to a prolonged spill event that
occurred from March through June 2023.
7.2.2 Enhance Management of NCMA Groundwater
Strategies:
Develop a groundwater model for the NCMA/NMMA or the entire SMRVGB.
Coordinate with the County and NMMA to develop new monitoring well(s) in key locations within the
SMRVGB.
Develop a Salt and Nutrient Management Plan (SNMP) for the NCMA/NMMA.
Develop and implement a framework for groundwater storage/conjunctive use, including return flows.
Update the 2002 Groundwater Management Agreement.
Discussion:
The NCMA agencies participated in the oversight of the performance of the SMRVGB characterization study
(Fugro, 2015) that was finalized with the distribution of the complete data sets in March 2016. The project
was conducted as part of the County IRWMP 2014 update, in part to prepare for and to provide the
foundational data for development of a numerical groundwater flow model and preparation of a basin-wide
SNMP. To date, the SNMP has not been initiated, but the groundwater flow modeling work has been completed
through Phase 1C, as described below. This groundwater flow model is associated with Central Coast Blue, a
recycled water project formerly known as the Regional Groundwater Sustainability Project. As part of Central
Coast Blue planning and technical studies, a localized groundwater flow model (the Phase 1A model) was
developed for the northern portion of the NCMA that evaluated the concept of injecting APW into the aquifer
to increase recharge, improve water supply reliability, and help prevent future occurrences of seawater
intrusion.
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Based on the results of the Phase 1A model and through funding by SSLOCSD Supplemental Environmental
Program, work was initiated in 2017 for development of the Phase 1B groundwater flow model. The model
domain of the Phase 1B model covers the entire NCMA, NMMA, and the portion of the SMVMA north of the
Santa Maria River. The purpose of the Phase 1B model and the subsequently refined Phase 1C model (see
Section 1.7.3, above) is to evaluate additional groundwater injection and extraction scenarios to further
support Central Coast Blue. The Phase 1C model, developed in 2021, is being utilized to identify the locations
of the proposed injection wells, quantify the amount of water that can be injected, evaluate strategies for
preventing seawater intrusion, and develop estimates of the overall yield that the Central Coast Blue
stakeholders will be able to receive from the project.
The Phase 1C model will also be a tool for the NCMA agencies to further evaluate basin yield and basin
management initiatives. In 2023 the NCMA TG undertook a review of the Phase 1C model to evaluate proper
calibration to water levels in the Deep Well Index wells. The NCMA TG also began discussions on using the
Phase 1C model to simulate groundwater conditions that would have resulted if the NMMA Supplemental
Water Project had been fully implemented in a timely manner. As part of this effort, the NCMA TG has also
made a request to the NMMA TG to provide all “New Urban Use” that has occurred since January 2005 within
the areas defined as “New Urban Use areas” in the 2005 Stipulation Exhibit 1D and within a 0.25 mile of
these areas as described in VI(E)(2) of the Stipulation. This data request was emailed to the NMMA TG on
January 8, 2024.
As part of the SLOFCWCD’s SMRVGB characterization study (Fugro, 2015), continuous monitoring transducers
were installed in 2015 in coastal sentry wells 36L01 and 36L02 (which are part of the NCMA Monitoring
Program) and in wells 11N/36W-12C01 and 11N/36W-12C02 (located in the NMMA and monitored by the
County and by NMMA). As a result, continuous water level and field-parameter water quality data were
collected from these wells throughout 2023.
Throughout 2022, the TG discussed various components and approaches to updating the 2002 Groundwater
Management Agreement. A draft Groundwater Management Agreement update was produced in 2023 but
has not been finalized pending completion of a companion Adaptive Management Agreement. Work on the
Adaptive Management Agreement and finalization of the updated Groundwater Management Agreement will
continue in 2024.
The monthly NCMA TG meetings provide for collaborative development of joint budget proposals for studies
and plans and shared water resources. In addition, the monthly meetings provide a forum for discussing the
data collected as part of the quarterly monitoring reports.
7.2.3 Monitor Supply and Demand and Share Information
Strategies:
Develop a Water Supply, Production, and Delivery Plan (WSPDP).
In conjunction with and through the umbrella of the Zone 3 agencies and SLOFCWCD, continue efforts to
evaluate potential drought emergency options and implement drought emergency actions.
Develop a coordinated Water Shortage Contingency Plan to respond to a severe water shortage condition
in the NCMA.
Share groundwater pumping data at monthly NCMA TG meetings.
Evaluate future water demands through comparison with the following UWMP projections:
Arroyo Grande 2022 UWMP (WSC, 2023)
Pismo Beach 2020 UWMP (WSC, 2021)
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Grover Beach 2020 UWMP (MKN, 2021)
OCSD is not required to prepare a UWMP because the community population does not meet the
minimum requirement threshold.
Discussion:
Water Supply, Production and Delivery Plan
In January 2015, the NCMA agencies developed a WSPDP that applies the strategic objectives to the various
supplies available to the area. The NCMA area receives supplies from Lopez Lake, the SWP, and the SMRVGB.
The purpose of the WSPDP is to provide the NCMA agencies with a delivery plan that optimizes use of existing
infrastructure and minimizes groundwater pumping from the SMRVGB. The plan includes the development of
a water supply and delivery modeling tool for the NCMA agencies, evaluation of three delivery scenarios, and
development of recommendations for water delivery.
The WSPDP made recommendations that were implemented or subject to further study. Components of the
WSPDP and the various recommendations incorporated into the Plan are summarized throughout Section 7.
The recommendations of the WSPDP reinforce the ongoing management efforts by the NCMA and provide
potential projects to improve water supply reliability and protect water quality during periods of drought.
Ongoing work to implement the recommendations includes evaluation of additional delivery facilities to add
operational flexibility to ensure optimum use of all supplies.
Implementing the WSPDP has allowed the NCMA to minimize the use of groundwater thereby protecting
against seawater intrusion while meeting the needs of its customers and other water users.
The WSPDP now provides a framework for the NCMA to manage the groundwater resource actively and
effectively, particularly in years of below-normal rainfall and below “normal” SWP delivery schedules. The
WSPDP outlines a strategy to provide sufficient supplies to NCMA water users in instances of reduced SWP
delivery.
Seawater intrusion is the most important potential adverse impact for the NCMA agencies to consider in their
efforts to effectively manage the aquifer. Seawater intrusion, a concern since the 1960s, would degrade the
quality of water in the aquifer and potentially render portions of the SMRVGB unsuitable for groundwater
production (DWR, 1970).
A Deep Well Index of the three primary deep sentry wells of 7.5 feet above 0.0 NAVD 88 has been recognized
as the threshold, above which it is thought that there is sufficient fresh water (groundwater) outflow to prevent
seawater intrusion. Inspection of the Deep Well Index in 2008–2009, before the period of water quality
degradation in wells 30N03 and 30N02, shows that the Deep Well Index dropped below the 7.5-foot trigger
value and remained below that level for almost 2 years. Since 2011, the Deep Well Index dropped several
times below the threshold, but usually for only a few months at a time.
In 2023, the Deep Well Index started the year above the trigger value with an index value of more than 9 feet
in January. The index value continued to climb through early April, peaking over 12 feet, and then generally
declined through early September, reaching a low point just over 10 feet. Since early September, the index
value has increased steadily, finishing the year at about 12 feet NAVD 88 (Figure 12, on page 34, above).
Zone 3 Extended Drought Emergency Options
Management activities have become more closely coordinated among the NCMA agencies as a result of the
2011 through 2015 drought. In particular, the implementation of the LRRP limited municipal diversions and
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downstream releases from Lopez Lake to ensure that water is available for future potentially dry years. In
addition, the Zone 3 agencies (which include the NCMA agencies) initiated a long-term drought planning effort.
The planning effort is intended to prepare water supplies for periods of extended drought conditions.
The NCMA agencies, in conjunction with the other Zone 3 agencies and SLOFCWCD, continue efforts to
evaluate potential drought emergency options and implement drought emergency actions. This initiative
includes identification, evaluation, and ranking of potential options available to Zone 3 to improve the
reliability of its water supplies. The Zone 3 agencies and the County have pledged to work collaboratively to
continue to evaluate and implement emergency water supply reliability options as required in conditions of
extended drought.
Cloud seeding operations were conducted during the 2022/2023 winter season using ground-based
equipment to enhance precipitation in the Lopez Lake drainage. The formal operational period began
December 1, 2022 and ended March 31, 2023. However, the seeding program was suspended following a
heavy rainfall event on January 9. Although there were discussions about possible seeding operations later in
the season, the program remained suspended as flooding concerns continued during subsequent storm
events through the remainder of the season.
Additional potential drought emergency options that the Zone 3 agencies have evaluated in the past few years
include the following:
State Water Project. Maximize importation of SLOFCWCD SWP supplies, including subcontractor supplies
and the large amount of unsubscribed Table A allocation.
Surplus Nacimiento Water Project (NWP) Water. Investigate transfer/exchange opportunities to obtain
surplus NWP water for the Zone 3 agencies (i.e., exchange agreements with the City of San Luis Obispo
and the Chorro Valley pipeline SWP subcontractors).
Water Market Purchases. Investigate opportunities to obtain additional imported water and deliver it to
the Zone 3 agencies through the SWP infrastructure (e.g., exchange agreements with San
Joaquin/Sacramento Valley farmers, water broker consultation, groundwater banking exchange
agreements, and others).
Morro Bay Desalination Plant Exchanges. Investigate opportunities to obtain SWP water from Morro Bay.
Land Fallowing. Evaluate potential agreements with local agriculture representatives to offer financial
incentives to fallow land within the Arroyo Grande and Cienega Valleys to make that irrigation water
available for municipal use.
Enhanced Conservation. Evaluate opportunities for enhanced water conservation by the Zone 3 agencies
(e.g., water rationing, no outdoor watering, agriculture water restrictions) to preserve additional water.
Nacimiento/California Men’s Colony Intertie. Complete design of a pipeline that would connect the NWP
pipeline to the California Men’s Colony Water Treatment Plant. Investigate opportunities for Zone 3
agencies to purchase NWP water and use exchange agreements and existing infrastructure to deliver
additional water to Zone 3 through the Coastal Branch pipeline.
Urban Water Management Plans
Arroyo Grande completed their 2022 UWMP30 in June 2023. Pismo Beach and Grover Beach have each
completed their 2020 UWMPs in June and December 2021, respectively. OCSD is not required to prepare an
UWMP because the community population does not meet the minimum requirement threshold; however, many
30 Although labeled 2022, this UWMP was prepared under guidance from DWR’s 2020 UWMP Guidebook.
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of the aspects of a UWMP are addressed through OCSD’s participation in the NCMA planning process. New to
the 2020 UWMP update cycle, water suppliers are required to prepare a standalone Water Shortage
Contingency Plan (WSCP) that can be updated independently of the UWMP. A WSCP documents a supplier’s
plans to manage and mitigate an actual water shortage condition, should one occur because of drought or
other impacts on water supplies.
Coordinated and Shared Data
Regular monitoring of activities that affect the groundwater basin and sharing of that information have
occurred for many years. The monitoring efforts include gathering data on hydrologic conditions, water supply
and demand, and groundwater pumping, levels, and quality. The current monitoring program is managed by
the NCMA agencies in accordance with the 2005 Stipulation and the 2008 Judgment, guided by the July 2008
Monitoring Program for the NCMA. The monitoring data and a summary of groundwater management activities
are summarized in the annual reports. Arroyo Grande, Grover Beach, and Pismo Beach have each evaluated
their future water demands as part of their respective UWMPs. The NCMA shares information with the two
other management areas (NMMA and SMVMA) through data exchange throughout the annual report
preparation cycle.
7.2.4 Manage Groundwater Levels and Prevent Seawater Intrusion
Strategies:
Use stormwater ponds to capture stormwater runoff and recharge the groundwater basin.
Install pressure transducers equipped with conductivity probes in key monitoring wells to provide
continuous groundwater elevation and specific conductivity data. The following wells have transducers:
24B03 (North Beach Campground) 31
30F03 (Highway 1) 31
30N02 (Pier Avenue) 31
36L01 (Oceano Dunes)
36L02 (Oceano Dunes)
32C03 (County Monitoring Well No. 3)
Collect and evaluate daily municipal pumping data to determine the impact on local groundwater elevation
levels.
Discussion:
Prevention of seawater intrusion through the management of groundwater levels is essential to protect the
shared resource. The NCMA agencies increase groundwater recharge with stormwater infiltration and closely
monitoring groundwater levels and water quality in sentry wells along the coast.
Arroyo Grande and Grover Beach each maintain stormwater retention ponds within their jurisdictions; the
SLOFCWCD maintains the stormwater system, including retention ponds, in OCSD. These ponds collect
stormwater runoff, allowing it to recharge the underlying aquifers. There are approximately 140 acres of
detention ponds in Arroyo Grande and 48 acres of detention ponds in Grover Beach. The stormwater detention
pond in OCSD is approximately one-half acre. Grover Beach modified its stormwater system in 2012 to direct
31 The transducers in each of these Deep Index Wells were outfitted with telemetry in October 2022. This upgrade provides
real-time monitoring of groundwater elevations and specific conductivity in each of these wells allowing for informed, timely
decision-making regarding the management NCMA groundwater resources.
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additional flow into one of its recharge basins. Because of its topography, lack of available space and proximity
to the ocean, Pismo Beach does not have any stormwater retention ponds for the purpose of groundwater
recharge.
The San Luis Obispo County Stormwater Resource Plan (stormwater Resource Plan) (SLO Co., 2019) was
submitted to the State Water Resources Control Board for review on February 28, 2019; final approval of the
plan was attained on February 25, 2020. The purpose of the Stormwater Resource Plan is to identify and
prioritize stormwater and dry weather runoff capture projects in the County through detailed analyses of
watershed conditions and processes, surface and groundwater resources, and the multiple benefits that can
be achieved through stormwater-related capital projects and other programmatic actions (SLO Co., 2019). The
Stormwater Resource Plan identifies four proposed projects within the NCMA, including the Pismo Preserve
Roads Improvement Project, the Oceano Drainage Improvement Project (which was completed in 2020), South
Halcyon Green/Complete Street, and a stormwater infiltration basins project. In 2019, OCSD started designing
the Oceano Stormwater Capture and Groundwater Recharge Project. Construction on this project began on
November 13, 2023. Project completion is expected during 2024. These proposed projects emphasize water
supply augmentation, environmental restoration and other community benefits, including an estimated annual
infiltration capacity of 26 AF and an instantaneous floodwater capture capacity of 3.37 AF (SLO Co., 2019).
Although closely related to the objectives to manage pumping, monitor supply and demand, and share
information, this objective to manage groundwater levels and prevent seawater intrusion also specifically
recognizes the proximity of production wells to the coast and the threat of seawater intrusion. The NCMA
agencies and SLOFCWCD have long cooperated in the monitoring of groundwater levels, including quarterly
measurement by the NCMA of groundwater levels in sentry wells at the coast. Upon assuming responsibility
for the coastal monitoring wells, the NCMA became aware of the need to upgrade the condition of the sentry
wells. In July 2010, the wellheads (surface completions) at the four sentry monitoring well clusters in the NCMA
were renovated (Todd, 2010). The renovations included raising the elevations of the top of each individual
well casing by 2 to 3 feet and resurveying relative to the NAVD 88 standard in late September 2010 (Wallace
Group, 2010). The individual well casings are now above the ground surface and protective locking steel risers
enclose each cluster. As a result of this work, the sentry wells in the NCMA are now protected from surface
contamination and tampering.
Quarterly measurement of groundwater levels aids in assessing the risk of seawater intrusion along the coast.
To enhance the data collection and assessment efforts, the NCMA installed pressure transducers equipped
with conductivity probes in four of the key sentry monitoring wells (24B03, 30F03, 30N02, and 24B01) to
provide continuous groundwater levels at key locations (the transducer in the shallow completion 24B01 was
later removed). By combining these data with the collection and evaluation of daily municipal pumping data,
the NCMA is better able to determine the response of local groundwater levels to extractions and, therefore,
can better manage the aquifer and NCMA portion of the SMRVGB. In October 2022, telemetry was added to
the transducers in the wells that make up the Deep Well Index (24B03, 30F03, and 30N02). The addition of
telemetry allows for real-time monitoring of groundwater elevations and specific conductivity in these wells.
A pressure transducer equipped with a conductivity probe was installed in County Monitoring Well #3 (32C03)
in April 2012 to monitor water level fluctuation and water quality variation in the area between the NCMA and
NMMA.
In 2015, pressure transducers equipped with conductivity probes were installed in coastal monitoring wells
36L01 and 36L02 located in the Oceano Dunes. Data from the transducers in these wells are now collected
on a quarterly basis along with the other sentry wells.
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Additional studies to enhance basin management efforts that have been discussed by the NCMA TG include
the following:
Consider implementation of a monthly groundwater elevation data analysis of the sentry wells during
periods when the Deep Well Index value is below the index target of 7.5 feet above 0.0 NAVD 88 for an
extended period. The addition of telemetry to the transducers installed in the three Deep Index Wells
(24B03, 30F03, and 30N02) has accomplished this goal.
Consider implementation of a monthly analysis of specific conductivity data from the wells with downhole
transducers during periods when the Deep Well Index value is below the index target of 7.5 feet to track
potential water quality degradation (an enhanced monitoring schedule of County Monitoring Well No. 3 is
not necessary because background water quality does not change or fluctuate significantly). If specific
conductivity data suggest water quality degradation, implement a monthly sampling and monitoring
program. The addition of telemetry to the transducers installed in the three Deep Index Wells (24B03,
30F03, and 30N02) has accomplished this goal.
Assess the potential impacts on sentry well groundwater elevations from extended periods of increased
groundwater pumping by conducting analytical modeling analyses to predict water level responses given
certain pumping scenarios. These analyses may prove fruitful as scenarios unfold regarding decreased
SWP deliveries or short-term emergency cuts to Lopez Lake deliveries.
7.2.5 Protect Groundwater Quality
Strategies:
Perform quarterly water quality monitoring at all sentry wells and County Well No. 3.
Gather continuous (every 4 hours) pressure (converts to depth to water), temperature, and specific
conductivity data from select monitoring wells to track water quality indicators for seawater intrusion.
Prepare an SNMP pursuant to state policy using the results of the SMRVGB characterization study (Fugro,
2015).
Construct the Central Coast Blue facility.
Support regional recycled water project planning through performance of a Recycled Water Facility
Planning Study (RWFPS) by the SSLOCSD. The RWFPS was completed in 2017.
Discussion:
The objective to protect groundwater quality is closely linked with the objective for monitoring and data sharing.
To meet this objective, all sources of water quality degradation, including the threat of seawater intrusion,
need to be recognized. Water quality threats and possible degradation affect the integrity of the groundwater
basin, potentially resulting in loss of use or the need for expensive water treatment processes. Sentry wells
are monitored quarterly for water quality and data from other NCMA production wells are assessed annually.
The monitoring program includes evaluation of potential contaminants in addition to those that might indicate
seawater intrusion. Temperature and specific conductivity probes have been installed in six monitoring wells
to provide continuous water quality tracking for early indication of seawater intrusion.
The NCMA agencies participated in the oversight of the performance of the SMRVGB characterization study
(Fugro, 2015). The project was conducted, in part, to prepare for and to provide the foundational data for
preparation of a basinwide SNMP. To date, the SNMP has not been initiated.
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Work continued throughout 2023 on the Central Coast Blue project. The project, currently in the final design
and permitting phase, will develop a sustainable, drought resilient water supply and help protect the SMRVGB.
7.2.6 Manage Cooperatively
Strategies:
Improve outreach to the agricultural community by enhancing coordination with local growers.
Coordinate groundwater monitoring data sharing and annual report preparation with the NCMA, NMMA,
and the SMVMA.
Improve interagency coordination among the NCMA agencies and include the County.
Transfer stored Lopez and SWP water amongst Zone 3 subcontractors to improve water supply availability
during drought conditions and water supply resiliency for the region.
Discussion:
Since 1983, NCMA management has been based on cooperative efforts of the affected parties, including the
NCMA agencies, private agricultural groundwater users, the County, the SLOFCWCD, and other local and state
agencies. Specifically, the NCMA agencies have limited their pumping and, in cooperation with SLOFCWCD,
invested in surface water supplies to reduce groundwater pumping to not exceed the safe yield of the NCMA
portion of the SMRVGB. Other organizations participate as appropriate. Each year the NCMA TG hosts a
meeting with agricultural representatives from throughout the NCMA to discuss the status of the basin, present
the findings of the annual report, and develop collaborative strategies for protecting the groundwater resource.
In addition to the efforts discussed in this 2023 Annual Report, cooperative management occurs through many
other venues and forums, including communication by the NCMA agencies in their respective public meetings
and participation in the WRAC.
The NCMA agencies participated in preparation and adoption of the 2019 update of the County IRWMP. The
IRWMP promotes integrated regional water management to ensure sustainable water uses, reliable water
supplies, better water quality, environmental stewardship, efficient urban development, protection of
agriculture, and a strong economy. The IRWMP integrates all the programs, plans, and projects within the
region into water supply, water quality, ecosystem preservation and restoration, groundwater monitoring and
management, and flood management programs.
Since the 2008 Judgment, the NCMA has taken the lead in cooperative management of its management area.
The NCMA TG met monthly (at a minimum) throughout 2023 and has been a willing and active participant in
the SMGBMA technical subcommittee, which first met in 2009 (the SMGBMA technical subcommittee did not
meet in 2023). The purpose of the SMGBMA technical subcommittee is to coordinate efforts such as enhanced
monitoring of groundwater levels and improved sharing of data among the management areas. With the
current threats to water supply in all management areas, greater communication, analytical collaboration, and
data sharing are encouraged, especially between NCMA and NMMA.
Actions initiated by NCMA in early 2016 resulted in increased discussion and collaboration between the NCMA
and NMMA that is ongoing. The NCMA-NMMA Management Coordination Committee has met several times
since 2017 to discuss items of mutual concern and develop strategies for addressing the concerns.
Another area of increased mutual collaboration between the NCMA and NMMA was the formation of a
technical team, consisting of representatives from the NCMA and NMMA, to collaboratively develop a single
data set of water level data points to prepare a consistent set of semiannual water level contour maps for the
NCMA and NMMA, so that the maps from each management area would represent a mutually agreed upon
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condition at the NCMA/NMMA boundary. This collaboration continued throughout 2023 through continued
assessment and evaluation of the water level database, sharing of new data, and discussions of knowledge
of hydrogeologic conditions gained. The result has been a series of groundwater elevation contour maps of
both the NCMA and the NMMA that reflect water level conditions at the NCMA/NMMA boundary.
A Modeling Subcommittee, composed of representatives from the NCMA and NMMA, was formed to discuss
the development of a numerical groundwater flow model of the portion of the SMRVGB north of the Santa
Maria River. When the Phase 1B groundwater flow model project was initiated in 2017, representatives from
this subcommittee formed a technical review and advisory committee to provide input to the modeling
consultant and monitor progress. An NMMA representative participated in the technical review and in an
advisory capacity throughout the development of the Phase 1B model. The Modeling Subcommittee has not
met since completion of the Phase 1B modeling project.
An initiative to modify the Zone 3 agency contracts to incorporate storage provisions was started in late 2019.
On August 11, 2022, the Zone 3 TAC voted to execute the amended and restated water supply contracts. The
new contracts went into effect at the end of October 2022. These contract changes allow the Zone 3
subcontractors to store their unused annual water entitlement and any surplus water they receive in Lopez
Reservoir, as well as allow for in-lieu storage of SWP water. The changes provide the subcontractors greater
flexibility to use their water supplies conjunctively (i.e., to implement a balanced use of surface and
groundwater supplies based on hydrologic conditions) and additionally allows subcontractors to transfer
stored Lopez and SWP water amongst themselves to improve water supply availability during drought
conditions and water supply resiliency for the region.
7.2.7 Encourage Water Conservation
Strategies:
Share updated water conservation information.
Implement UWMPs.
Discussion:
Water conservation, or water use efficiency, is linked to the monitoring of supply and demand and the
management of pumping. Water conservation reduces overall demand on all sources, including groundwater,
and supports management objectives to manage groundwater levels and prevent seawater intrusion. In
addition, water conservation is consistent with state policies seeking to achieve a 20 percent reduction in
water use by the year 2020 (DWR et al., 2010). Water conservation activities in the NCMA are summarized in
various documents produced by the NCMA agencies, including the 2022 UWMP30 of Arroyo Grande (WSC,
2023) and the 2020 UWMPs of Pismo Beach (WSC, 2021) and Grover Beach (MKN, 2021). (OCSD is not
required to prepare an UWMP.)
The water conservation measures instituted by each NCMA agency are summarized below.
Arroyo Grande
On March 28, 2023, The Arroyo Grande City Council adopted a Resolution rescinding the declaration of a Stage 1
Water Shortage Emergency and related water shortage restrictions and penalties. A Stage 1 emergency had
been declared on October 12, 2021 as a result of the ongoing severe drought conditions, declining groundwater
levels, low Lopez Lake levels and resulting reductions in deliveries of water from Lopez Lake.
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As of March 14, 2023, the United States Drought Monitor showed San Luis Obispo County as no longer in a
drought (as was identified in September 2021), nor abnormally dry (as was identified in February 2023) and the
Stage 1 emergency declaration was rescinded.
Mandatory water conservation measures that remain in place include the following:
Use of water that results in excessive gutter runoff is prohibited.
No water will be used for cleaning driveways, patios, parking lots, sidewalks, streets, or other such use
except where necessary to protect the public health and safety.
Outdoor water use for washing vehicles shall be attended and have hand-controlled watering devices,
typically including spring-loaded shutoff nozzles.
Outdoor irrigation is prohibited between 10 a.m. and 4 p.m.
Irrigation of private and public landscaping, turf areas, and gardens is permitted at even-numbered
addresses only on Mondays and Thursdays, and at odd-numbered addresses only on Tuesdays and
Fridays.
No irrigation of private and public landscaping, turf areas, and gardens is permitted on Wednesdays.
Irrigation is permitted at all addresses on Saturdays and Sundays.
In all cases, customers are directed to use no more water than necessary to maintain landscaping.
Emptying and refilling swimming pools and commercial spas are prohibited except to prevent structural
damage and/or to provide for the public health and safety.
Use of potable water for soil compaction or dust control purposes in construction activities is prohibited.
To help manage the use of water, the City offers water conservation incentive programs designed to decrease
overall water use. The conservation and incentive programs include the following:
Cash for Grass. This program reimburses residents $1 per square foot of turf removed with a minimum of
500 square feet of turf removed and a maximum of 5,000 square feet of turf removed. Turf must be
replaced with drought-tolerant plans, permeable mulch or artificial turf. Applicants are required to remain
in compliance with the program’s terms and conditions for a five year period following the rebate.
Plumbing Retrofit Program. This program includes installation or adjustment of showerheads, toilets,
faucet aerators, and pressure regulators for single-family and multi-family residential units constructed
before 1992. This program has been in place since 2004 at an expense to the City of more than
$1.55 million.
Water-Wise Landscaping Program. This program provides resources for designing and installing water-
wise landscaping in San Luis Obispo County, selecting climate-appropriate plants, and irrigation and
drainage improvements that will help residents improve their landscaping and protect the watershed.
Washing Machine Rebate. This program pays water customers a one-time $200 rebate for the installation
of a certified water-efficient washing machine.
Mandatory Plumbing Retrofit. Upon change of ownership of any residential property, the seller must
retrofit the property’s plumbing fixtures to meet defined low-water-use criteria.
Water Conservation Hotline.
As required in the 2020 UWMP update cycle, Arroyo Grande prepared a standalone WSCP that can be updated
independently of the UWMP. As droughts and other events impacting water supply occur more frequently and
intensely, the WSCP helps prepare for and respond to water shortages. The WSCP includes six stages of action.
Each stage relates a supply reduction range to an associated demand reduction target, which may vary based
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on the nature of triggering conditions that are dependent on the cause, severity, and anticipated duration of
the water supply shortage. Each year City staff assesses their current water supply and estimates the available
future supply based on SMRVGB groundwater levels, and storage levels at Lopez Lake. If the projected supply
will not meet demand, then City staff presents status to the City Council and makes recommendations to enact
shortage response actions and building restrictions as needed to accommodate the reduced supply.
Pismo Beach
In 2014, Pismo Beach introduced the first-in-the-state waterless urinal mandate and a 0.5-gallon per minute
(gpm) restroom aerator retrofit requirement. The components of this program include the following:
Waterless Urinal Retrofits. All existing urinals in the City were retrofitted to waterless urinals before
February 14, 2016.
Faucet Aerators. New residential restroom construction requires faucets that are fitted with aerators that
emit no more than 0.5 gpm. Restroom faucets in all publicly accessible restrooms, including those in hotel
rooms, lobbies and restrooms, restaurants, schools, commercial and retail buildings, public buildings, and
similar publicly accessible restrooms were retrofitted to install aerators that emit no more than 0.5 gpm.
Sub-meters in New Construction. All new multi-unit buildings, regardless of proposed use, were required
to have a separate sub-meter capable of measuring the water use of every usable unit, separate common
space, and landscaping that is expected to use at least 25 gallons of water per day on average for the
course of a year, regardless of the overall size of the building. Buildings that have a separate water meter
for each unit are exempt.
Also in 2014, Pismo Beach adopted several Water Conservation Incentive Programs to help reduce water
consumption and ensure a reliable future water supply. On February 2, 2021, the Pismo Beach City Council
updated the Water Conservation Incentive Programs list to include the following:
Cash for Grass. This program reimburses residents for each square foot of lawn removed (minimum
300 square feet) and replaced with drought-tolerant landscaping, which is required to have an automatic
timer and drip or micro-spray irrigation.
Water-Wise Landscaping Program. This program provides resources for designing and installing water-
wise landscaping in San Luis Obispo County, selecting climate-appropriate plants, and irrigation and
drainage improvements that will help residents improve their landscaping and protect the watershed.
High Efficiency Toilet Rebate Program. This program provides a one-time rebate for each 3.5-gallon-per-
flush or higher toilet replaced with a 1.28-gallon-per-flush or lower toilet.
Water Conservation Website.
In January 2017, Pismo Beach adopted an updated schedule of development impact fees to include new
recycled water fees for all new development, redevelopment, and additions to existing buildings that create
additional dwelling units or additional non-residential floor area, to help fund the cost of the Central Coast
Blue project.
In June 2017, in response to the State of California action to lift the drought emergency and State-mandated
water use restrictions throughout the state, Pismo Beach declared a “Normal Water Supply” and adopted an
Urgency Ordinance O-2017-003, revising the restrictions associated with each water supply status to conform
to State mandates.
On May 18, 2022, Pismo Beach City Council adopted an urgency ordinance, which prohibits the installation of
new, irrigated turf for all development.
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On March 21, 2023, Pismo Beach City Council rescinded the previously declared Critical Water Supply
condition by declaring a Normal Water Supply Condition. The water use restrictions associated with the Normal
Water Supply Condition are:
Use of water which causes runoff onto adjacent properties, non-irrigated areas, private and public
walkways, roadways, gutters, parking lots or structures is prohibited.
Outdoor water use for washing vehicles, boats, paved surfaces, buildings, and similar uses shall be
attended and have hand-controlled water devices, which shut off the water immediately when not in use.
No water shall be used for cleaning driveways, patios, parking lots, sidewalks, streets, or other such uses
except as found necessary by the city to protect the public health or safety.
Outdoor irrigation
Outdoor irrigation is prohibited between the hours of 10 a.m. and 4 p.m.
Applying water to outdoor landscapes during and within 48 hours after measurable rainfall is
prohibited.
Restaurants shall serve drinking water only in response to a specific request by a customer.
Using water in a fountain or other decorative water feature, except where the water is part of a recirculating
system, is prohibited.
As required in the 2020 UWMP update, Pismo Beach prepared a standalone WSCP that can be updated
independently of the UWMP. As droughts and other events impacting water supply occur more frequently and
intensely, the WSCP helps prepare for and respond to water shortages. The WSCP includes six standard stages
of action tied to actual water shortage conditions in 10 percent increments. Each stage relates a supply
reduction range to an associated demand reduction target, which may vary based on the nature of triggering
conditions that are dependent on the cause, severity, and anticipated duration of the water supply shortage.
Each year City staff assesses their current water supply and estimates the available future supply based on
their SWP Table A allocation, the SMRVGB groundwater levels, and storage levels at Lopez Lake. If the
projected supply will not meet demand, then City staff presents status to the City Council and makes
recommendations to enact shortage response actions and building restrictions as needed to accommodate
the reduced supply (WSC, 2021).
On November 15, 2022, the Pismo Beach City Council directed staff to work with the SLOFCWCD to increase
the Pismo Beach SWP drought buffer to 3,192 AFY. City staff has had initial conversations with SLOFCWCD
staff; however this drought buffer increase is still pending as of the date of this report.
Grover Beach
On March 13, 2023, Grover Beach City Council rescinded the previously declared Stage III Water Shortage
Condition and declared a Stage I condition (the lowest of 6 possible conditions set forth in the Grover Beach
WSCP). Although not enforced during Stage I conditions, the following water use restrictions remain in place:
Washing of sidewalks, driveways, or roadways where air blowers or sweeping provides a reasonable
alternative.
Refilling of private pools except to maintain water levels.
Planting of turf and other new landscaping, unless it consists of drought-tolerant plants.
Washing vehicles, boats, etc. without a quick-acting shut-off nozzle on the hose.
Washing any exterior surfaces unless using a quick-acting shut-off nozzle on the hose.
Restaurant water service, unless requested.
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Use of potable water for construction purposes, unless no other source of water or method can be used.
Operation of ornamental fountain or car wash unless water is re-circulated.
In 2020, Grover Beach made changes to its water conservation program through preparation and adoption of
a WSCP,32 enacted when water supplies are insufficient to support demand. As droughts and other events
impacting water supply occur more frequently and intensely, the WSCP helps prepare for and respond to water
shortages. The changes include 6 stages of action tied to actual water shortage conditions in 10 percent
increments. Each stage relates a supply reduction range to an associated demand reduction target, which
may vary based on the nature of triggering conditions that are dependent on the cause, severity, and
anticipated duration of the water supply shortage. Grover Beach city staff continuously monitor the availability
of water supply sources 33 and, if one or more set of triggering conditions are met, the Public Works Director
notifies the City Council and recommends declaration of the appropriate stage of water shortage.
In addition to the voluntary water use restrictions, Grover Beach has implemented water conservation
incentive programs including the following:
Cash for Grass Rebate Program
Smart Irrigation Controller and Sensor Rebate Program
Toilet Fixture, Showerhead, and Sink Aerator Retrofit Rebate Program
Washing Machine Rebate Program
OCSD
Given the population of its service area, OCSD is not required to prepare an UWMP nor was it required to
reduce water consumption as mandated by the Governor for urban water suppliers during the recent drought.
Outdoor water use restrictions have been adopted, as required. In April 2015, OCSD adopted a rate increase
that included tiered rates to promote water conservation. These rates were reduced in July 2017, upon
adoption of the Post Drought Consumption Charges and Supplemental Water Charge Ordinance. In October
2020, the OCSD increased water rates and a new water rate structure was adopted that reduced the number
of consumption tiers from five to two. This brought the OCSD rates more closely into conformance with
Proposition 218 requirements. The Tier 1 rate is tied directly to the cost of the Lopez Water supply and the
Tier 2 rate is tied directly to the cost of the State Water supply. In addition, the new rate structure eliminated
the six units of water previously included in the base rate so that customers now pay a consumption charge
for every unit of water used, which further promotes conservation.
OCSD pumped only 6 percent of its groundwater entitlement in 2023 and is using its Lopez and SWP supplies.
OCSD’s conservation efforts realized 29 percent reductions from 2013 levels in 2023.
Strategies exist in the event of temporary non-delivery of SWP and Lopez Lake water and other unforeseen
circumstances. Current strategies include resumption of groundwater pumping, storage of Lopez Lake
entitlement water, and maximizing deliveries of SWP water as provided in SWP contracts.
32 The WSCP is a component of the City of Grover Beach’s 2020 UWMP (MKN, 2021).
33 Including monitoring of Lopez Lake supplies and monitoring of groundwater availability based on the Deep Well Index value
as compared with its threshold value of 7.5 feet NAVD 88.
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7.2.8 Evaluate Alternative Sources of Supply
Strategies:
Evaluate expanded use of recycled water, including implementation of Central Coast Blue.
Analyze the capacity of the Lopez Lake and Coastal Branch pipelines to maximize deliveries of surface
water. The following analyses have been completed:
Lopez Lake Pipeline Capacity Evaluation (WSC, 2011a)
Lopez Lake Pipeline Capacity Re-Evaluation (WSC, 2011b)
Coastal Branch Capacity Assessment (WSC, 2011a)
Lopez Bypass and State Water Delivery Evaluation (WSC, 2017)
Optimize existing surface water supplies, including surface water storage, through the development of a
framework for interagency exchanges and transfers, including SWP and Lopez Lake supplies.
Maximize Lopez Lake pipeline capacity.
Discussion:
The NCMA agencies continue to evaluate alternative sources of water supply that could provide a more reliable
and sustainable water supply for the NCMA. An expanded portfolio of water supply sources will support
sustainable management of the groundwater resource and help to reduce the risk of water shortages. These
alternative sources include the following:
State Water Project. OCSD and Pismo Beach are currently SWP customers. Both agencies increased their
SWP allocations by securing “drought buffers” to increase the availability of supply during periods of SWP
shortfalls. Grover Beach and Arroyo Grande are not SWP customers. However, Arroyo Grande approved a
measure in 2016 authorizing the City to purchase SWP water from the SLOFCWCD’s excess entitlement
on a temporary basis and only during a declared local water emergency. To date, Arroyo Grande has not
declared such an emergency and has not purchased SWP water.
Water Recycling. As discussed in Section 7.2.5, above, Pismo Beach and the SSLOCSD both prepared
RWFPSs to evaluate alternatives for a recycled water program that could provide a supplemental water
supply source and improve the water supply reliability for the Pismo Beach and the SSLOCSD member
agencies (Arroyo Grande, Grover Beach, and OCSD).
Section 7.2.5, above, also describes ongoing efforts for Central Coast Blue that will enable the NCMA
agencies to produce recycled water to augment their water supplies. Construction of the new facility will
allow for the use of recycled water to recharge the groundwater basin and provide a new, drought-proof
source of water supply for the area. As conceived, the project includes construction of a distribution system
that will inject APW into the SMRVGB and will allow the NCMA agencies to increase recharge to the aquifer,
improve water supply reliability, and help prevent future occurrences of seawater intrusion.
Lopez Lake Expansion. In 2008, the County sponsored a preliminary assessment of the concept of
installing an inflatable rubber dam at the Lopez Dam spillway. Subsequently, the SLOFCWCD CSA 12 and
Arroyo Grande, Grover Beach, and Pismo Beach funded a study to further analyze the feasibility of
increasing the yield of Lopez Lake by raising the spillway height with an inflatable dam or permanent
extension. The study was finalized in 2013 and identified the potential to increase the annual yield from
Lopez Lake by 500 AFY with a spillway height increase of 6 feet (Stetson, 2013). The NCMA agencies and
Zone 3 are continuing to evaluate other aspects of the project, including impacts on the Habitat
Conservation Plan process.
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Desalination. In 2006, Arroyo Grande, Grover Beach, and OCSD used Proposition 50 funds to complete a
feasibility study on desalination as an additional water supply option for the NCMA. This alternative supply
is not considered to be a viable option at this time.
When PG&E announced plans to close its Diablo Canyon Power Plant, previous efforts by the SLOFCWCD
to (1) evaluate the potential to expand the existing desalination facility at the PG&E Diablo Canyon Power
Plant and (2) connect it to the Lopez Lake pipeline to provide a supplemental water supply for the Zone 3
agencies were terminated.
Nacimiento Pipeline Extension. In 2006, Arroyo Grande, Grover Beach, and OCSD completed an
evaluation of a Nacimiento pipeline extension to determine the feasibility of delivery of water from the
Nacimiento reservoir to the NCMA. This alternative supply is not considered to be a viable option at this
time.
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SECTION 8: References
Allen, R.G., L.S. Pereira, D. Raes, and M. Smith. 1998. Crop Evapotranspiration: Guidelines for Computing
Crop Water Requirements: Food and Agriculture Organization of the United Nations, Irrigation and
Drainage Paper 56, 300p.
Cal Poly. 2019. California Evapotranspiration Data for Irrigation District Water Balances, Irrigation Training &
Research Center, San Luis Obispo, CA 93407-0730.
CHG. 2017. Phase 1A Model TM; Groundwater Flow Analysis Regional Groundwater Sustainability Project
Arroyo Grande/Tri-Cities Mesa Area. Prepared for City of Pismo Beach and Water Systems Consulting.
Prepared by Cleath-Harris Geologists. February 2017.
DWR. 1970. Sea-Water Intrusion: Pismo-Guadalupe Area. Bulletin No. 63-3, 76 p. Prepared by the California
Department of Water Resources.
DWR. 1975. Sea-Water Intrusion in California, Inventory of Coastal Ground Water Basins, Bulletin No. 63-5.
Prepared by the California Department of Water Resources.
DWR. 1979. Ground Water in the Arroyo Grande Area, Southern District Report. Prepared by the California
Department of Water Resources.
DWR. 2002. Water Resources of the Arroyo Grande – Nipomo Mesa Area: Southern District Report. Prepared
by the California Department of Water Resources.
DWR. 2016. IWFM Demand Calculator IDC 2015: Theoretical Documentation and User’s Manual. Central
Valley Modeling Unit. Prepared by the California Department of Water Resources Bay Delta Office.
DWR et al. 2010. 20X2020 Water Conservation Plan. Prepared by the California Department of Water
Resources, State Water Resources Control Board, California Bay-Delta Authority, California Energy
Commission, California Department of Public Health, California Public Utilities Commission, California
Air Resources Board.
Fugro. 2015. Santa Maria Groundwater Basin Characterization and Planning Activities Study, Final Report.
Prepared for San Luis Obispo County Flood Control and Water Conservation District, December 30,
2015. Prepared by Fugro Consultants, Inc.
Geoscience Support Services. 2019. City of Pismo Beach and South San Luis Obispo County Sanitation
District, Central Coast Blue Phase 1B Hydrogeologic Evaluation. Prepared for Water Systems
Consulting. November 25, 2019.
Geoscience Support Services. 2021. City of Pismo Beach Central Coast Blue Phase 1C Hydrogeologic
Evaluation Model Updates and Scenario Evaluation. Prepared for Water Systems Consulting. June 8,
2021.
Miller, G. A. and R.E. Evenson. 1966. Utilization of Groundwater in the Santa Maria Valley Area, California.
USGS Water Supply Paper 1819-A.
MKN. 2021. City of Grover Beach 2020 Urban Water Management Plan. December 2021.
Mualem, Y. 1976. “A new model for predicting the hydraulic conductivity of unsaturated porous media.”
Water Resources Res., 12, 513-522.
NCMA. 2009. 2008 Annual Monitoring Report, prepared by Todd Engineers for Northern Cities Management
Area. April 2009.
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NCMA. 2010. 2009 Annual Monitoring Report, prepared by Todd Engineers for Northern Cities Management
Area. April 2010.
NCMA. 2011. 2010 Annual Monitoring Report, prepared by GEI Consultants for Northern Cities Management
Area. April 2011.
NCMA. 2012. 2011 Annual Monitoring Report, prepared by GEI Consultants for Northern Cities Management
Area. May 2012.
NCMA. 2013. 2012 Annual Monitoring Report, prepared by GEI Consultants for Northern Cities Management
Area. April 2013.
NCMA. 2014. 2013 Annual Monitoring Report, prepared by Fugro Consultants for Northern Cities
Management Area. April 2014.
NCMA. 2015. 2014 Annual Monitoring Report, prepared by Fugro Consultants for Northern Cities
Management Area. April 2015.
NCMA. 2016. 2015 Annual Monitoring Report, prepared by Fugro Consultants for Northern Cities
Management Area. April 2016.
NCMA. 2017. 2016 Annual Monitoring Report, prepared by GSI Water Solutions, Inc. for Northern Cities
Management Area. April 2017.
NCMA. 2018. 2017 Annual Monitoring Report, prepared by GSI Water Solutions, Inc. for Northern Cities
Management Area. April 2018.
NCMA. 2019. 2018 Annual Monitoring Report, prepared by GSI Water Solutions, Inc. for Northern Cities
Management Area. April 2019.
NCMA. 2020. 2019 Annual Monitoring Report, prepared by GSI Water Solutions, Inc. for Northern Cities
Management Area. April 2020.
NCMA. 2021. 2020 Annual Monitoring Report, prepared by GSI Water Solutions, Inc. for Northern Cities
Management Area. April 2021.
NCMA. 2022. 2021 Annual Monitoring Report, prepared by GSI Water Solutions, Inc. for Northern Cities
Management Area. April 2022.
NCMA. 2023. 2022 Annual Monitoring Report, prepared by GSI Water Solutions, Inc. for Northern Cities
Management Area. April 2023.
NMMA. 2010. 2nd Annual Report, Calendar Year 2009, prepared by the Nipomo Mesa Management Area
Technical Group, April 2010.
NMMA. 2011. 3rd Annual Report, Calendar Year 2010, prepared by the Nipomo Mesa Management Area
Technical Group, April 2011.
NMMA. 2012. 4th Annual Report, Calendar Year 2011, prepared by the Nipomo Mesa Management Area
Technical Group, April 2012.
NMMA. 2013. 5th Annual Report, Calendar Year 2012, prepared by the Nipomo Mesa Management Area
Technical Group, April 2013.
NMMA. 2014. 6th Annual Report, Calendar Year 2013, prepared by the Nipomo Mesa Management Area
Technical Group, April 2014.
NMMA. 2015. 7th Annual Report, Calendar Year 2014, prepared by the Nipomo Mesa Management Area
Technical Group, April 2015.
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NMMA. 2016. 8th Annual Report, Calendar Year 2015, prepared by the Nipomo Mesa Management Area
Technical Group, April 2016.
NMMA. 2017. 9th Annual Report, Calendar Year 2016, prepared by the Nipomo Mesa Management Area
Technical Group, April 2017.
NMMA. 2018. 10th Annual Report, Calendar Year 2017, prepared by the Nipomo Mesa Management Area
Technical Group, April 2018.
NMMA. 2019. 11th Annual Report, Calendar Year 2018, prepared by the Nipomo Mesa Management Area
Technical Group, April 2019.
NMMA. 2020. 12th Annual Report, Calendar Year 2019, prepared by the Nipomo Mesa Management Area
Technical Group, April 2020.
NMMA. 2021. 13th Annual Report, Calendar Year 2020, prepared by the Nipomo Mesa Management Area
Technical Group, April 2021.
NMMA. 2022. 14th Annual Report, Calendar Year 2021, prepared by the Nipomo Mesa Management Area
Technical Group, April 2022.
NMMA. 2023. 15th Annual Report, Calendar Year 2022, prepared by the Nipomo Mesa Management Area
Technical Group, April 2023.
PG&E. 2014. Central Coastal California Seismic Imaging Project (CCSIP), report to the California Public
Utilities Commission. http://www.pge.com/en/safety/systemworks/dcpp/seismicsafety/report.page.
Prepared by Pacific Gas and Electric Company.
Ploessel M.R. 1982. Ghyben-herzberg ratio. In: Beaches and Coastal Geology. Encyclopedia of Earth
Sciences Series. Springer, New York, NY. https://doi.org/10.1007/0-387-30843-1_207.
Ramboll. 2022. Pismo Beach Groundwater Investigation; Processing, Inversion and Interpretation of AEM
Data. Prepared for City of Pismo Beach and Water Systems Consulting. January 2022.
SLO Co. 2019. San Luis Obispo County Stormwater Resource Plan. Submitted to the State Water Resources
Control Board on February 28, 2019. Prepared by San Luis Obispo County.
SLOFCWCD. 2014. Low Reservoir Response Plan for the San Luis Obispo County Flood Control and Water
Conservation District Zone 3. Prepared by the San Luis Obispo County Flood Control and Water
Conservation District Zone 3.
Stetson. 2013. Lopez Lake Spillway Raise Project Report. Prepared by Stetson Engineers, Inc.
Todd. 2007. Water Balance Study for the Northern Cities Area. Prepared by Todd Engineers.
Todd. 2008. Monitoring Program for the Northern Cities Management Area. Prepared by Todd Engineers.
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APPENDIX A
NCMA Sentry Well Water Level and Water Quality Data
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Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)32S/12E-24B01 North Beach Campground - ShallowAlluvium 10/10/2023 Stove Pipe Top of PVC Casing 13.337.505.8332S/12E-24B01 North Beach Campground - ShallowAlluvium7/4/2023 Stove Pipe Top of PVC Casing 13.337.166.1732S/12E-24B01 North Beach Campground - ShallowAlluvium4/11/2023 Stove Pipe Top of PVC Casing 13.336.836.5032S/12E-24B01 North Beach Campground - ShallowAlluvium2/7/2023 Stove Pipe Top of PVC Casing 13.337.455.8832S/12E-24B01 North Beach Campground - ShallowAlluvium10/3/2022 Stove Pipe Top of PVC Casing 13.337.365.9732S/12E-24B01 North Beach Campground - ShallowAlluvium7/11/2022 Stove Pipe Top of PVC Casing 13.337.006.3332S/12E-24B01 North Beach Campground - ShallowAlluvium4/5/2022 Stove Pipe Top of PVC Casing 13.337.266.0732S/12E-24B01 North Beach Campground - ShallowAlluvium1/4/2022 Stove Pipe Top of PVC Casing 13.337.715.6232S/12E-24B01 North Beach Campground - ShallowAlluvium10/5/2021 Stove Pipe Top of PVC Casing 13.337.385.9532S/12E-24B01 North Beach Campground - ShallowAlluvium7/13/2021 Stove Pipe Top of PVC Casing 13.337.435.9032S/12E-24B01 North Beach Campground - ShallowAlluvium4/6/2021 Stove Pipe Top of PVC Casing 13.337.385.9532S/12E-24B01 North Beach Campground - ShallowAlluvium1/6/2021 Stove Pipe Top of PVC Casing 13.337.505.8332S/12E-24B01 North Beach Campground - ShallowAlluvium10/7/2020 Stove Pipe Top of PVC Casing 13.337.316.0232S/12E-24B01 North Beach Campground - ShallowAlluvium7/6/2020 Stove Pipe Top of PVC Casing 13.337.645.6932S/12E-24B01 North Beach Campground - ShallowAlluvium4/17/2020 Stove Pipe Top of PVC Casing 13.337.655.6832S/12E-24B01 North Beach Campground - ShallowAlluvium1/7/2020 Stove Pipe Top of PVC Casing 13.337.785.5532S/12E-24B01 North Beach Campground - ShallowAlluvium10/9/2019 Stove Pipe Top of PVC Casing 13.337.365.9732S/12E-24B01 North Beach Campground - ShallowAlluvium7/9/2019 Stove Pipe Top of PVC Casing 13.337.515.8232S/12E-24B01 North Beach Campground - ShallowAlluvium4/9/2019 Stove Pipe Top of PVC Casing 13.337.186.1532S/12E-24B01 North Beach Campground - ShallowAlluvium1/8/2019 Stove Pipe Top of PVC Casing 13.337.635.7032S/12E-24B01 North Beach Campground - ShallowAlluvium10/9/2018 Stove Pipe Top of PVC Casing 13.337.296.0432S/12E-24B01 North Beach Campground - ShallowAlluvium7/10/2018 Stove Pipe Top of PVC Casing 13.336.586.7532S/12E-24B01 North Beach Campground - ShallowAlluvium4/10/2018 Stove Pipe Top of PVC Casing 13.337.106.2332S/12E-24B01 North Beach Campground - ShallowAlluvium1/10/2018 Stove Pipe Top of PVC Casing 13.337.585.7532S/12E-24B01 North Beach Campground - ShallowAlluvium 10/10/2017 Stove Pipe Top of PVC Casing 13.337.465.8732S/12E-24B01 North Beach Campground - ShallowAlluvium7/11/2017 Stove Pipe Top of PVC Casing 13.336.846.4932S/12E-24B01 North Beach Campground - ShallowAlluvium4/11/2017 Stove Pipe Top of PVC Casing 13.337.286.0532S/12E-24B01 North Beach Campground - ShallowAlluvium1/10/2017 Stove Pipe Top of PVC Casing 13.338.045.2932S/12E-24B01 North Beach Campground - ShallowAlluvium 10/12/2016 Stove Pipe Top of PVC Casing 13.337.046.2932S/12E-24B01 North Beach Campground - ShallowAlluvium7/19/2016 Stove Pipe Top of PVC Casing 13.336.806.5332S/12E-24B01 North Beach Campground - ShallowAlluvium4/12/2016 Stove Pipe Top of PVC Casing 13.337.236.1032S/12E-24B01 North Beach Campground - ShallowAlluvium1/12/2016 Stove Pipe Top of PVC Casing 13.338.414.9232S/12E-24B01 North Beach Campground - ShallowAlluvium 10/13/2015 Stove Pipe Top of PVC Casing 13.337.855.4832S/12E-24B01 North Beach Campground - ShallowAlluvium7/14/2015 Stove Pipe Top of PVC Casing 13.337.525.8132S/12E-24B01 North Beach Campground - ShallowAlluvium4/14/2015 Stove Pipe Top of PVC Casing 13.337.365.9732S/12E-24B01 North Beach Campground - ShallowAlluvium1/13/2015 Stove Pipe Top of PVC Casing 13.337.755.5832S/12E-24B01 North Beach Campground - ShallowAlluvium 10/14/2014 Stove Pipe Top of PVC Casing 13.337.825.5132S/12E-24B01 North Beach Campground - ShallowAlluvium7/29/2014 Stove Pipe Top of PVC Casing 13.337.595.7432S/12E-24B01 North Beach Campground - ShallowAlluvium6/4/2014 Stove Pipe Top of PVC Casing 13.337.066.2732S/12E-24B01 North Beach Campground - ShallowAlluvium4/15/2014 Stove Pipe Top of PVC Casing 13.337.635.7032S/12E-24B01 North Beach Campground - ShallowAlluvium1/14/2014 Stove Pipe Top of PVC Casing 13.337.835.5032S/12E-24B01 North Beach Campground - ShallowAlluvium 10/14/2013 Stove Pipe Top of PVC Casing 13.337.515.8232S/12E-24B01 North Beach Campground - ShallowAlluvium7/9/2013 Stove Pipe Top of PVC Casing 13.337.495.8432S/12E-24B01 North Beach Campground - ShallowAlluvium4/10/2013 Stove Pipe Top of PVC Casing 13.336.586.7532S/12E-24B01 North Beach Campground - ShallowAlluvium1/14/2013 Stove Pipe Top of PVC Casing 13.337.865.47P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 222 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)32S/12E-24B01 North Beach Campground - ShallowAlluvium 10/29/2012 Stove Pipe Top of PVC Casing 13.337.665.6732S/12E-24B01 North Beach Campground - ShallowAlluvium7/23/2012 Stove Pipe Top of PVC Casing 13.337.795.5432S/12E-24B01 North Beach Campground - ShallowAlluvium4/18/2012 Stove Pipe Top of PVC Casing 13.338.005.3332S/12E-24B01 North Beach Campground - ShallowAlluvium1/11/2012 Stove Pipe Top of PVC Casing 13.337.865.4732S/12E-24B01 North Beach Campground - ShallowAlluvium 11/21/2011 Stove Pipe Top of PVC Casing 13.337.785.5532S/12E-24B01 North Beach Campground - ShallowAlluvium7/26/2011 Stove Pipe Top of PVC Casing 13.337.206.1332S/12E-24B01 North Beach Campground - ShallowAlluvium4/20/2011 Stove Pipe Top of PVC Casing 13.337.186.1532S/12E-24B01 North Beach Campground - ShallowAlluvium1/24/2011 Stove Pipe Top of PVC Casing 13.337.805.5332S/12E-24B01 North Beach Campground - ShallowAlluvium 10/21/2010 Stove Pipe Top of PVC Casing 13.337.216.1232S/12E-24B01 North Beach Campground - ShallowAlluvium7/27/2010 Stove Pipe Top of PVC Casing 13.337.106.2332S/12E-24B01 North Beach Campground - ShallowAlluvium4/27/2010 Stove Pipe Top of PVC Casing 13.336.866.4732S/12E-24B01 North Beach Campground - ShallowAlluvium1/27/2010 Stove Pipe Top of PVC Casing 13.337.575.7632S/12E-24B01 North Beach Campground - ShallowAlluvium 10/19/2009 Stove Pipe Top of PVC Casing 13.338.424.9132S/12E-24B01 North Beach Campground - ShallowAlluvium8/20/2009 Stove Pipe Top of PVC Casing 13.337.455.8832S/12E-24B01 North Beach Campground - ShallowAlluvium5/12/2009 Stove Pipe Top of PVC Casing 13.337.126.2132S/12E-24B01 North Beach Campground - ShallowAlluvium4/7/2009 Stove Pipe Top of PVC Casing 13.339.094.2432S/12E-24B01 North Beach Campground - ShallowAlluvium 10/15/2008 Stove Pipe Top of PVC Casing 13.335.987.3532S/12E-24B01 North Beach Campground - ShallowAlluvium4/15/2008 Stove Pipe Top of PVC Casing 13.338.055.2832S/12E-24B01 North Beach Campground - ShallowAlluvium 10/18/2007 Stove Pipe Top of PVC Casing 13.335.557.7832S/12E-24B01 North Beach Campground - ShallowAlluvium 10/19/2006 Stove Pipe Top of PVC Casing 13.339.953.3832S/12E-24B01 North Beach Campground - ShallowAlluvium4/25/2006 Stove Pipe Top of PVC Casing 13.337.705.6332S/12E-24B01 North Beach Campground - ShallowAlluvium10/7/2005 Stove Pipe Top of PVC Casing 13.336.406.9332S/12E-24B01 North Beach Campground - ShallowAlluvium4/29/2005 Stove Pipe Top of PVC Casing 13.338.055.2832S/12E-24B01 North Beach Campground - ShallowAlluvium 10/29/2004 Stove Pipe Top of PVC Casing 13.336.007.3332S/12E-24B01 North Beach Campground - ShallowAlluvium4/8/2004 Stove Pipe Top of PVC Casing 13.339.903.4332S/12E-24B01 North Beach Campground - ShallowAlluvium10/8/2003 Stove Pipe Top of PVC Casing 13.339.503.8332S/12E-24B01 North Beach Campground - ShallowAlluvium 10/14/2002 Stove Pipe Top of PVC Casing 13.337.106.2332S/12E-24B01 North Beach Campground - ShallowAlluvium4/9/2002 Stove Pipe Top of PVC Casing 13.339.903.4332S/12E-24B01 North Beach Campground - ShallowAlluvium10/5/2001 Stove Pipe Top of PVC Casing 13.338.005.3332S/12E-24B01 North Beach Campground - ShallowAlluvium4/23/2001 Stove Pipe Top of PVC Casing 13.338.504.8332S/12E-24B01 North Beach Campground - ShallowAlluvium4/24/2000 Stove Pipe Top of PVC Casing 13.337.206.1332S/12E-24B01 North Beach Campground - ShallowAlluvium 10/29/1999 Stove Pipe Top of PVC Casing 13.337.505.8332S/12E-24B01 North Beach Campground - ShallowAlluvium4/15/1999 Stove Pipe Top of PVC Casing 13.338.924.4132S/12E-24B01 North Beach Campground - ShallowAlluvium 10/20/1998 Stove Pipe Top of PVC Casing 13.338.504.8332S/12E-24B01 North Beach Campground - ShallowAlluvium4/23/1998 Stove Pipe Top of PVC Casing 13.339.703.6332S/12E-24B01 North Beach Campground - ShallowAlluvium 10/22/1997 Stove Pipe Top of PVC Casing 13.337.545.7932S/12E-24B01 North Beach Campground - ShallowAlluvium4/29/1997 Stove Pipe Top of PVC Casing 13.337.575.7632S/12E-24B01 North Beach Campground - ShallowAlluvium 10/23/1996 Stove Pipe Top of PVC Casing 13.336.207.1332S/12E-24B01 North Beach Campground - ShallowAlluvium4/29/1996 Stove Pipe Top of PVC Casing 13.337.505.8332S/12E-24B01 North Beach Campground - ShallowAlluvium 10/10/1995 Stove Pipe Top of PVC Casing 13.337.405.9332S/12E-24B01 North Beach Campground - ShallowAlluvium4/19/1995 Stove Pipe Top of PVC Casing 13.338.814.5232S/12E-24B01 North Beach Campground - ShallowAlluvium11/1/1994 Stove Pipe Top of PVC Casing 13.336.007.3332S/12E-24B01 North Beach Campground - ShallowAlluvium4/11/1994 Stove Pipe Top of PVC Casing 13.336.746.5932S/12E-24B01 North Beach Campground - ShallowAlluvium 10/13/1993 Stove Pipe Top of PVC Casing 13.336.756.5832S/12E-24B01 North Beach Campground - ShallowAlluvium4/8/1993 Stove Pipe Top of PVC Casing 13.337.815.52P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 223 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)32S/12E-24B01 North Beach Campground - ShallowAlluvium11/4/1992 Stove Pipe Top of PVC Casing 13.337.505.8332S/12E-24B01 North Beach Campground - ShallowAlluvium4/21/1992 Stove Pipe Top of PVC Casing 13.336.806.5332S/12E-24B01 North Beach Campground - ShallowAlluvium 10/11/1991 Stove Pipe Top of PVC Casing 13.336.197.1432S/12E-24B01 North Beach Campground - ShallowAlluvium4/19/1991 Stove Pipe Top of PVC Casing 13.336.356.9832S/12E-24B01 North Beach Campground - ShallowAlluvium 10/11/1990 Stove Pipe Top of PVC Casing 13.336.366.9732S/12E-24B01 North Beach Campground - ShallowAlluvium4/24/1990 Stove Pipe Top of PVC Casing 13.336.167.1732S/12E-24B01 North Beach Campground - ShallowAlluvium10/4/1989 Stove Pipe Top of PVC Casing 13.337.196.1432S/12E-24B01 North Beach Campground - ShallowAlluvium4/17/1989 Stove Pipe Top of PVC Casing 13.336.396.9432S/12E-24B01 North Beach Campground - ShallowAlluvium 10/20/1988 Stove Pipe Top of PVC Casing 13.336.307.0332S/12E-24B01 North Beach Campground - ShallowAlluvium4/29/1988 Stove Pipe Top of PVC Casing 13.336.446.8932S/12E-24B01 North Beach Campground - ShallowAlluvium4/21/1988 Stove Pipe Top of PVC Casing 13.336.366.9732S/12E-24B01 North Beach Campground - ShallowAlluvium 10/19/1987 Stove Pipe Top of PVC Casing 13.336.257.0832S/12E-24B01 North Beach Campground - ShallowAlluvium4/13/1987 Stove Pipe Top of PVC Casing 13.337.525.8132S/12E-24B01 North Beach Campground - ShallowAlluvium 10/31/1986 Stove Pipe Top of PVC Casing 13.336.826.5132S/12E-24B01 North Beach Campground - ShallowAlluvium4/27/1986 Stove Pipe Top of PVC Casing 13.336.526.8132S/12E-24B01 North Beach Campground - ShallowAlluvium 10/18/1985 Stove Pipe Top of PVC Casing 13.337.296.0432S/12E-24B01 North Beach Campground - ShallowAlluvium4/22/1985 Stove Pipe Top of PVC Casing 13.338.604.7332S/12E-24B01 North Beach Campground - ShallowAlluvium 10/29/1984 Stove Pipe Top of PVC Casing 13.338.584.7532S/12E-24B01 North Beach Campground - ShallowAlluvium 10/28/1983 Stove Pipe Top of PVC Casing 13.338.784.5532S/12E-24B01 North Beach Campground - ShallowAlluvium5/6/1982 Stove Pipe Top of PVC Casing 13.338.554.7832S/12E-24B01 North Beach Campground - ShallowAlluvium 10/19/1981 Stove Pipe Top of PVC Casing 13.338.624.7132S/12E-24B01 North Beach Campground - ShallowAlluvium4/21/1981 Stove Pipe Top of PVC Casing 13.338.644.6932S/12E-24B01 North Beach Campground - ShallowAlluvium 10/21/1980 Stove Pipe Top of PVC Casing 13.338.115.2232S/12E-24B01 North Beach Campground - ShallowAlluvium5/9/1980 Stove Pipe Top of PVC Casing 13.338.624.7132S/12E-24B01 North Beach Campground - ShallowAlluvium11/7/1979 Stove Pipe Top of PVC Casing 13.338.105.2332S/12E-24B01 North Beach Campground - ShallowAlluvium4/17/1979 Stove Pipe Top of PVC Casing 13.338.574.7632S/12E-24B01 North Beach Campground - ShallowAlluvium5/17/1977 Stove Pipe Top of PVC Casing 13.338.315.0232S/12E-24B01 North Beach Campground - ShallowAlluvium6/9/1976 Stove Pipe Top of PVC Casing 13.33-3.3016.6332S/12E-24B01 North Beach Campground - ShallowAlluvium5/21/1976 Stove Pipe Top of PVC Casing 13.336.706.6332S/12E-24B01 North Beach Campground - ShallowAlluvium1/14/1976 Stove Pipe Top of PVC Casing 13.338.704.6332S/12E-24B01 North Beach Campground - ShallowAlluvium7/7/1975 Stove Pipe Top of PVC Casing 13.338.704.6332S/12E-24B01 North Beach Campground - ShallowAlluvium4/1/1975 Stove Pipe Top of PVC Casing 13.338.624.7132S/12E-24B01 North Beach Campground - ShallowAlluvium6/7/1974 Stove Pipe Top of PVC Casing 13.339.703.6332S/12E-24B01 North Beach Campground - ShallowAlluvium4/1/1974 Stove Pipe Top of PVC Casing 13.338.704.6332S/12E-24B01 North Beach Campground - ShallowAlluvium9/20/1973 Stove Pipe Top of PVC Casing 13.338.544.7932S/12E-24B01 North Beach Campground - ShallowAlluvium6/29/1972 Stove Pipe Top of PVC Casing 13.338.135.2032S/12E-24B01 North Beach Campground - ShallowAlluvium2/29/1972 Stove Pipe Top of PVC Casing 13.339.703.6332S/12E-24B01 North Beach Campground - ShallowAlluvium2/21/1972 Stove Pipe Top of PVC Casing 13.339.254.0832S/12E-24B01 North Beach Campground - ShallowAlluvium 11/29/1971 Stove Pipe Top of PVC Casing 13.338.344.9932S/12E-24B01 North Beach Campground - ShallowAlluvium8/28/1971 Stove Pipe Top of PVC Casing 13.338.454.8832S/12E-24B01 North Beach Campground - ShallowAlluvium6/2/1971 Stove Pipe Top of PVC Casing 13.338.115.2232S/12E-24B01 North Beach Campground - ShallowAlluvium3/2/1971 Stove Pipe Top of PVC Casing 13.338.894.4432S/12E-24B01 North Beach Campground - ShallowAlluvium 12/15/1970 Stove Pipe Top of PVC Casing 13.338.285.0532S/12E-24B01 North Beach Campground - ShallowAlluvium8/4/1970 Stove Pipe Top of PVC Casing 13.337.705.6332S/12E-24B01 North Beach Campground - ShallowAlluvium6/3/1970 Stove Pipe Top of PVC Casing 13.338.404.93P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 224 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)32S/12E-24B01 North Beach Campground - ShallowAlluvium3/27/1970 Stove Pipe Top of PVC Casing 13.338.544.7932S/12E-24B01 North Beach Campground - ShallowAlluvium1/29/1970 Stove Pipe Top of PVC Casing 13.338.474.8632S/12E-24B01 North Beach Campground - ShallowAlluvium10/3/1969 Stove Pipe Top of PVC Casing 13.338.155.1832S/12E-24B01 North Beach Campground - ShallowAlluvium7/23/1969 Stove Pipe Top of PVC Casing 13.337.705.6332S/12E-24B01 North Beach Campground - ShallowAlluvium6/24/1969 Stove Pipe Top of PVC Casing 13.337.705.6332S/12E-24B01 North Beach Campground - ShallowAlluvium5/22/1969 Stove Pipe Top of PVC Casing 13.337.705.6332S/12E-24B01 North Beach Campground - ShallowAlluvium4/18/1969 Stove Pipe Top of PVC Casing 13.338.574.7632S/12E-24B01 North Beach Campground - ShallowAlluvium1/15/1969 Stove Pipe Top of PVC Casing 13.337.995.3432S/12E-24B01 North Beach Campground - ShallowAlluvium 12/12/1968 Stove Pipe Top of PVC Casing 13.337.895.4432S/12E-24B01 North Beach Campground - ShallowAlluvium 11/14/1968 Stove Pipe Top of PVC Casing 13.337.705.6332S/12E-24B01 North Beach Campground - ShallowAlluvium 10/17/1968 Stove Pipe Top of PVC Casing 13.337.236.1032S/12E-24B01 North Beach Campground - ShallowAlluvium9/14/1968 Stove Pipe Top of PVC Casing 13.337.066.2732S/12E-24B01 North Beach Campground - ShallowAlluvium8/13/1968 Stove Pipe Top of PVC Casing 13.337.475.8632S/12E-24B01 North Beach Campground - ShallowAlluvium7/22/1968 Stove Pipe Top of PVC Casing 13.337.026.3132S/12E-24B01 North Beach Campground - ShallowAlluvium6/24/1968 Stove Pipe Top of PVC Casing 13.337.006.3332S/12E-24B01 North Beach Campground - ShallowAlluvium5/30/1968 Stove Pipe Top of PVC Casing 13.337.016.3232S/12E-24B01 North Beach Campground - ShallowAlluvium4/20/1968 Stove Pipe Top of PVC Casing 13.337.865.4732S/12E-24B01 North Beach Campground - ShallowAlluvium3/21/1968 Stove Pipe Top of PVC Casing 13.337.715.6232S/12E-24B01 North Beach Campground - ShallowAlluvium2/22/1968 Stove Pipe Top of PVC Casing 13.338.035.3032S/12E-24B01 North Beach Campground - ShallowAlluvium1/16/1968 Stove Pipe Top of PVC Casing 13.338.364.9732S/12E-24B01 North Beach Campground - ShallowAlluvium12/8/1967 Stove Pipe Top of PVC Casing 13.338.045.2932S/12E-24B01 North Beach Campground - ShallowAlluvium 11/13/1967 Stove Pipe Top of PVC Casing 13.337.715.6232S/12E-24B01 North Beach Campground - ShallowAlluvium 10/11/1967 Stove Pipe Top of PVC Casing 13.336.846.4932S/12E-24B01 North Beach Campground - ShallowAlluvium9/5/1967 Stove Pipe Top of PVC Casing 13.337.355.9832S/12E-24B01 North Beach Campground - ShallowAlluvium8/8/1967 Stove Pipe Top of PVC Casing 13.337.136.2032S/12E-24B01 North Beach Campground - ShallowAlluvium7/12/1967 Stove Pipe Top of PVC Casing 13.337.016.3232S/12E-24B01 North Beach Campground - ShallowAlluvium6/1/1967 Stove Pipe Top of PVC Casing 13.337.505.8332S/12E-24B01 North Beach Campground - ShallowAlluvium5/2/1967 Stove Pipe Top of PVC Casing 13.337.605.73P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 225 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)32S/12E-24B02 North Beach Campground - MiddlePaso Robles 10/10/2023 Stove Pipe Top of PVC Casing 13.418.045.3732S/12E-24B02 North Beach Campground - MiddlePaso Robles 7/4/2023 Stove Pipe Top of PVC Casing 13.417.266.1532S/12E-24B02 North Beach Campground - MiddlePaso Robles 4/11/2023 Stove Pipe Top of PVC Casing 13.417.336.0832S/12E-24B02 North Beach Campground - MiddlePaso Robles 2/7/2023 Stove Pipe Top of PVC Casing 13.417.775.6432S/12E-24B02 North Beach Campground - MiddlePaso Robles 10/3/2022 Stove Pipe Top of PVC Casing 13.416.796.6232S/12E-24B02 North Beach Campground - MiddlePaso Robles 7/11/2022 Stove Pipe Top of PVC Casing 13.416.247.1732S/12E-24B02 North Beach Campground - MiddlePaso Robles 4/5/2022 Stove Pipe Top of PVC Casing 13.416.546.8732S/12E-24B02 North Beach Campground - MiddlePaso Robles 1/4/2022 Stove Pipe Top of PVC Casing 13.417.855.5632S/12E-24B02 North Beach Campground - MiddlePaso Robles 10/5/2021 Stove Pipe Top of PVC Casing 13.417.026.3932S/12E-24B02 North Beach Campground - MiddlePaso Robles 7/13/2021 Stove Pipe Top of PVC Casing 13.416.486.9332S/12E-24B02 North Beach Campground - MiddlePaso Robles 4/6/2021 Stove Pipe Top of PVC Casing 13.417.336.0832S/12E-24B02 North Beach Campground - MiddlePaso Robles 1/6/2021 Stove Pipe Top of PVC Casing 13.417.316.1032S/12E-24B02 North Beach Campground - MiddlePaso Robles 10/7/2020 Stove Pipe Top of PVC Casing 13.416.946.4732S/12E-24B02 North Beach Campground - MiddlePaso Robles 7/6/2020 Stove Pipe Top of PVC Casing 13.417.236.1832S/12E-24B02 North Beach Campground - MiddlePaso Robles 4/7/2020 Stove Pipe Top of PVC Casing 13.418.045.3732S/12E-24B02 North Beach Campground - MiddlePaso Robles 1/7/2020 Stove Pipe Top of PVC Casing 13.417.655.7632S/12E-24B02 North Beach Campground - MiddlePaso Robles 10/9/2019 Stove Pipe Top of PVC Casing 13.417.066.3532S/12E-24B02 North Beach Campground - MiddlePaso Robles 7/9/2019 Stove Pipe Top of PVC Casing 13.417.186.2332S/12E-24B02 North Beach Campground - MiddlePaso Robles 4/9/2019 Stove Pipe Top of PVC Casing 13.417.086.3332S/12E-24B02 North Beach Campground - MiddlePaso Robles 1/8/2019 Stove Pipe Top of PVC Casing 13.417.585.8332S/12E-24B02 North Beach Campground - MiddlePaso Robles 10/9/2018 Stove Pipe Top of PVC Casing 13.416.936.4832S/12E-24B02 North Beach Campground - MiddlePaso Robles 7/10/2018 Stove Pipe Top of PVC Casing 13.416.417.0032S/12E-24B02 North Beach Campground - MiddlePaso Robles 4/10/2018 Stove Pipe Top of PVC Casing 13.417.565.8532S/12E-24B02 North Beach Campground - MiddlePaso Robles 1/10/2018 Stove Pipe Top of PVC Casing 13.418.015.4032S/12E-24B02 North Beach Campground - MiddlePaso Robles 10/10/2017 Stove Pipe Top of PVC Casing 13.417.126.2932S/12E-24B02 North Beach Campground - MiddlePaso Robles 7/11/2017 Stove Pipe Top of PVC Casing 13.416.656.7632S/12E-24B02 North Beach Campground - MiddlePaso Robles 4/11/2017 Stove Pipe Top of PVC Casing 13.417.326.0932S/12E-24B02 North Beach Campground - MiddlePaso Robles 1/10/2017 Stove Pipe Top of PVC Casing 13.418.255.1632S/12E-24B02 North Beach Campground - MiddlePaso Robles 10/12/2016 Stove Pipe Top of PVC Casing 13.416.536.8832S/12E-24B02 North Beach Campground - MiddlePaso Robles 7/19/2016 Stove Pipe Top of PVC Casing 13.415.977.4432S/12E-24B02 North Beach Campground - MiddlePaso Robles 4/12/2016 Stove Pipe Top of PVC Casing 13.417.216.2032S/12E-24B02 North Beach Campground - MiddlePaso Robles 1/12/2016 Stove Pipe Top of PVC Casing 13.418.075.3432S/12E-24B02 North Beach Campground - MiddlePaso Robles 10/13/2015 Stove Pipe Top of PVC Casing 13.416.976.4432S/12E-24B02 North Beach Campground - MiddlePaso Robles 7/14/2015 Stove Pipe Top of PVC Casing 13.416.616.8032S/12E-24B02 North Beach Campground - MiddlePaso Robles 4/14/2015 Stove Pipe Top of PVC Casing 13.416.456.9632S/12E-24B02 North Beach Campground - MiddlePaso Robles 1/13/2015 Stove Pipe Top of PVC Casing 13.417.306.1132S/12E-24B02 North Beach Campground - MiddlePaso Robles 10/14/2014 Stove Pipe Top of PVC Casing 13.416.976.4432S/12E-24B02 North Beach Campground - MiddlePaso Robles 7/29/2014 Stove Pipe Top of PVC Casing 13.416.536.8832S/12E-24B02 North Beach Campground - MiddlePaso Robles 6/4/2014 Stove Pipe Top of PVC Casing 13.415.338.0832S/12E-24B02 North Beach Campground - MiddlePaso Robles 4/15/2014 Stove Pipe Top of PVC Casing 13.417.036.3832S/12E-24B02 North Beach Campground - MiddlePaso Robles 1/14/2014 Stove Pipe Top of PVC Casing 13.417.246.1732S/12E-24B02 North Beach Campground - MiddlePaso Robles 10/14/2013 Stove Pipe Top of PVC Casing 13.416.506.9132S/12E-24B02 North Beach Campground - MiddlePaso Robles 7/9/2013 Stove Pipe Top of PVC Casing 13.416.417.0032S/12E-24B02 North Beach Campground - MiddlePaso Robles 4/10/2013 Stove Pipe Top of PVC Casing 13.417.256.1632S/12E-24B02 North Beach Campground - MiddlePaso Robles 1/14/2013 Stove Pipe Top of PVC Casing 13.417.975.44P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 226 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)32S/12E-24B02 North Beach Campground - MiddlePaso Robles 10/29/2012 Stove Pipe Top of PVC Casing 13.417.705.7132S/12E-24B02 North Beach Campground - MiddlePaso Robles 7/23/2012 Stove Pipe Top of PVC Casing 13.417.465.9532S/12E-24B02 North Beach Campground - MiddlePaso Robles 4/18/2012 Stove Pipe Top of PVC Casing 13.418.105.3132S/12E-24B02 North Beach Campground - MiddlePaso Robles 1/11/2012 Stove Pipe Top of PVC Casing 13.418.115.3032S/12E-24B02 North Beach Campground - MiddlePaso Robles 11/21/2011 Stove Pipe Top of PVC Casing 13.417.895.5232S/12E-24B02 North Beach Campground - MiddlePaso Robles 7/26/2011 Stove Pipe Top of PVC Casing 13.417.076.3432S/12E-24B02 North Beach Campground - MiddlePaso Robles 4/20/2011 Stove Pipe Top of PVC Casing 13.417.286.1332S/12E-24B02 North Beach Campground - MiddlePaso Robles 1/24/2011 Stove Pipe Top of PVC Casing 13.417.895.5232S/12E-24B02 North Beach Campground - MiddlePaso Robles 10/21/2010 Stove Pipe Top of PVC Casing 13.416.796.6232S/12E-24B02 North Beach Campground - MiddlePaso Robles 7/27/2010 Stove Pipe Top of PVC Casing 13.416.536.8832S/12E-24B02 North Beach Campground - MiddlePaso Robles 4/27/2010 Stove Pipe Top of PVC Casing 13.416.367.0532S/12E-24B02 North Beach Campground - MiddlePaso Robles 1/27/2010 Stove Pipe Top of PVC Casing 13.417.326.0932S/12E-24B02 North Beach Campground - MiddlePaso Robles 10/19/2009 Stove Pipe Top of PVC Casing 13.418.444.9732S/12E-24B02 North Beach Campground - MiddlePaso Robles 8/20/2009 Stove Pipe Top of PVC Casing 13.416.616.8032S/12E-24B02 North Beach Campground - MiddlePaso Robles 5/12/2009 Stove Pipe Top of PVC Casing 13.415.967.4532S/12E-24B02 North Beach Campground - MiddlePaso Robles 10/15/2008 Stove Pipe Top of PVC Casing 13.416.167.2532S/12E-24B02 North Beach Campground - MiddlePaso Robles 4/15/2008 Stove Pipe Top of PVC Casing 13.417.535.8832S/12E-24B02 North Beach Campground - MiddlePaso Robles 10/18/2007 Stove Pipe Top of PVC Casing 13.416.956.4632S/12E-24B02 North Beach Campground - MiddlePaso Robles 4/17/2007 Stove Pipe Top of PVC Casing 13.417.366.0532S/12E-24B02 North Beach Campground - MiddlePaso Robles 10/19/2006 Stove Pipe Top of PVC Casing 13.417.306.1132S/12E-24B02 North Beach Campground - MiddlePaso Robles 4/25/2006 Stove Pipe Top of PVC Casing 13.418.055.3632S/12E-24B02 North Beach Campground - MiddlePaso Robles 10/7/2005 Stove Pipe Top of PVC Casing 13.417.605.8132S/12E-24B02 North Beach Campground - MiddlePaso Robles 4/28/2005 Stove Pipe Top of PVC Casing 13.419.783.6332S/12E-24B02 North Beach Campground - MiddlePaso Robles 10/29/2004 Stove Pipe Top of PVC Casing 13.417.705.7132S/12E-24B02 North Beach Campground - MiddlePaso Robles 4/8/2004 Stove Pipe Top of PVC Casing 13.417.206.2132S/12E-24B02 North Beach Campground - MiddlePaso Robles 10/14/2002 Stove Pipe Top of PVC Casing 13.417.705.7132S/12E-24B02 North Beach Campground - MiddlePaso Robles 4/9/2002 Stove Pipe Top of PVC Casing 13.417.406.0132S/12E-24B02 North Beach Campground - MiddlePaso Robles 10/5/2001 Stove Pipe Top of PVC Casing 13.418.305.1132S/12E-24B02 North Beach Campground - MiddlePaso Robles 4/23/2001 Stove Pipe Top of PVC Casing 13.417.905.5132S/12E-24B02 North Beach Campground - MiddlePaso Robles 4/24/2000 Stove Pipe Top of PVC Casing 13.417.306.1132S/12E-24B02 North Beach Campground - MiddlePaso Robles 10/29/1999 Stove Pipe Top of PVC Casing 13.417.805.6132S/12E-24B02 North Beach Campground - MiddlePaso Robles 4/15/1999 Stove Pipe Top of PVC Casing 13.418.405.0132S/12E-24B02 North Beach Campground - MiddlePaso Robles 10/20/1998 Stove Pipe Top of PVC Casing 13.417.505.9132S/12E-24B02 North Beach Campground - MiddlePaso Robles 4/23/1998 Stove Pipe Top of PVC Casing 13.418.405.0132S/12E-24B02 North Beach Campground - MiddlePaso Robles 10/22/1997 Stove Pipe Top of PVC Casing 13.418.005.4132S/12E-24B02 North Beach Campground - MiddlePaso Robles 4/29/1997 Stove Pipe Top of PVC Casing 13.417.116.3032S/12E-24B02 North Beach Campground - MiddlePaso Robles 10/23/1996 Stove Pipe Top of PVC Casing 13.417.026.3932S/12E-24B02 North Beach Campground - MiddlePaso Robles 4/29/1996 Stove Pipe Top of PVC Casing 13.417.505.9132S/12E-24B02 North Beach Campground - MiddlePaso Robles 10/10/1995 Stove Pipe Top of PVC Casing 13.416.906.5132S/12E-24B02 North Beach Campground - MiddlePaso Robles 4/19/1995 Stove Pipe Top of PVC Casing 13.417.316.1032S/12E-24B02 North Beach Campground - MiddlePaso Robles 11/1/1994 Stove Pipe Top of PVC Casing 13.416.826.5932S/12E-24B02 North Beach Campground - MiddlePaso Robles 4/11/1994 Stove Pipe Top of PVC Casing 13.417.166.2532S/12E-24B02 North Beach Campground - MiddlePaso Robles 10/13/1993 Stove Pipe Top of PVC Casing 13.417.216.2032S/12E-24B02 North Beach Campground - MiddlePaso Robles 4/8/1993 Stove Pipe Top of PVC Casing 13.417.475.9432S/12E-24B02 North Beach Campground - MiddlePaso Robles 11/4/1992 Stove Pipe Top of PVC Casing 13.416.107.31P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 227 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)32S/12E-24B02 North Beach Campground - MiddlePaso Robles 4/21/1992 Stove Pipe Top of PVC Casing 13.416.357.0632S/12E-24B02 North Beach Campground - MiddlePaso Robles 10/11/1991 Stove Pipe Top of PVC Casing 13.415.847.5732S/12E-24B02 North Beach Campground - MiddlePaso Robles 4/19/1991 Stove Pipe Top of PVC Casing 13.416.486.9332S/12E-24B02 North Beach Campground - MiddlePaso Robles 10/11/1990 Stove Pipe Top of PVC Casing 13.416.047.3732S/12E-24B02 North Beach Campground - MiddlePaso Robles 4/24/1990 Stove Pipe Top of PVC Casing 13.416.167.2532S/12E-24B02 North Beach Campground - MiddlePaso Robles 10/4/1989 Stove Pipe Top of PVC Casing 13.416.397.0232S/12E-24B02 North Beach Campground - MiddlePaso Robles 4/17/1989 Stove Pipe Top of PVC Casing 13.416.576.8432S/12E-24B02 North Beach Campground - MiddlePaso Robles 10/20/1988 Stove Pipe Top of PVC Casing 13.416.307.1132S/12E-24B02 North Beach Campground - MiddlePaso Robles 4/29/1988 Stove Pipe Top of PVC Casing 13.416.846.5732S/12E-24B02 North Beach Campground - MiddlePaso Robles 4/21/1988 Stove Pipe Top of PVC Casing 13.416.776.6432S/12E-24B02 North Beach Campground - MiddlePaso Robles 10/19/1987 Stove Pipe Top of PVC Casing 13.416.736.6832S/12E-24B02 North Beach Campground - MiddlePaso Robles 4/13/1987 Stove Pipe Top of PVC Casing 13.418.025.3932S/12E-24B02 North Beach Campground - MiddlePaso Robles 10/31/1986 Stove Pipe Top of PVC Casing 13.417.006.4132S/12E-24B02 North Beach Campground - MiddlePaso Robles 4/27/1986 Stove Pipe Top of PVC Casing 13.417.056.3632S/12E-24B02 North Beach Campground - MiddlePaso Robles 10/18/1985 Stove Pipe Top of PVC Casing 13.417.206.2132S/12E-24B02 North Beach Campground - MiddlePaso Robles 4/22/1985 Stove Pipe Top of PVC Casing 13.417.406.0132S/12E-24B02 North Beach Campground - MiddlePaso Robles 10/29/1984 Stove Pipe Top of PVC Casing 13.417.445.9732S/12E-24B02 North Beach Campground - MiddlePaso Robles 10/28/1983 Stove Pipe Top of PVC Casing 13.418.025.3932S/12E-24B02 North Beach Campground - MiddlePaso Robles 5/6/1982 Stove Pipe Top of PVC Casing 13.417.655.7632S/12E-24B02 North Beach Campground - MiddlePaso Robles 10/19/1981 Stove Pipe Top of PVC Casing 13.417.196.2232S/12E-24B02 North Beach Campground - MiddlePaso Robles 4/21/1981 Stove Pipe Top of PVC Casing 13.417.665.7532S/12E-24B02 North Beach Campground - MiddlePaso Robles 10/21/1980 Stove Pipe Top of PVC Casing 13.417.206.2132S/12E-24B02 North Beach Campground - MiddlePaso Robles 5/9/1980 Stove Pipe Top of PVC Casing 13.417.196.2232S/12E-24B02 North Beach Campground - MiddlePaso Robles 11/7/1979 Stove Pipe Top of PVC Casing 13.417.985.4332S/12E-24B02 North Beach Campground - MiddlePaso Robles 4/17/1979 Stove Pipe Top of PVC Casing 13.417.805.6132S/12E-24B02 North Beach Campground - MiddlePaso Robles 12/4/1978 Stove Pipe Top of PVC Casing 13.418.155.2632S/12E-24B02 North Beach Campground - MiddlePaso Robles 5/4/1978 Stove Pipe Top of PVC Casing 13.418.704.7132S/12E-24B02 North Beach Campground - MiddlePaso Robles 11/7/1977 Stove Pipe Top of PVC Casing 13.417.256.1632S/12E-24B02 North Beach Campground - MiddlePaso Robles 5/17/1977 Stove Pipe Top of PVC Casing 13.417.186.2332S/12E-24B02 North Beach Campground - MiddlePaso Robles 6/9/1976 Stove Pipe Top of PVC Casing 13.410.8112.6032S/12E-24B02 North Beach Campground - MiddlePaso Robles 1/14/1976 Stove Pipe Top of PVC Casing 13.417.705.7132S/12E-24B02 North Beach Campground - MiddlePaso Robles 7/7/1975 Stove Pipe Top of PVC Casing 13.417.705.7132S/12E-24B02 North Beach Campground - MiddlePaso Robles 4/17/1975 Stove Pipe Top of PVC Casing 13.417.705.7132S/12E-24B02 North Beach Campground - MiddlePaso Robles 6/7/1974 Stove Pipe Top of PVC Casing 13.418.704.7132S/12E-24B02 North Beach Campground - MiddlePaso Robles 9/20/1973 Stove Pipe Top of PVC Casing 13.417.386.0332S/12E-24B02 North Beach Campground - MiddlePaso Robles 6/29/1972 Stove Pipe Top of PVC Casing 13.417.655.7632S/12E-24B02 North Beach Campground - MiddlePaso Robles 3/2/1972 Stove Pipe Top of PVC Casing 13.417.905.5132S/12E-24B02 North Beach Campground - MiddlePaso Robles 2/29/1972 Stove Pipe Top of PVC Casing 13.418.085.3332S/12E-24B02 North Beach Campground - MiddlePaso Robles 11/29/1971 Stove Pipe Top of PVC Casing 13.417.705.7132S/12E-24B02 North Beach Campground - MiddlePaso Robles 8/25/1971 Stove Pipe Top of PVC Casing 13.417.306.1132S/12E-24B02 North Beach Campground - MiddlePaso Robles 6/2/1971 Stove Pipe Top of PVC Casing 13.417.605.8132S/12E-24B02 North Beach Campground - MiddlePaso Robles 12/15/1970 Stove Pipe Top of PVC Casing 13.418.055.3632S/12E-24B02 North Beach Campground - MiddlePaso Robles 8/4/1970 Stove Pipe Top of PVC Casing 13.417.515.9032S/12E-24B02 North Beach Campground - MiddlePaso Robles 6/3/1970 Stove Pipe Top of PVC Casing 13.417.535.8832S/12E-24B02 North Beach Campground - MiddlePaso Robles 3/27/1970 Stove Pipe Top of PVC Casing 13.418.005.41P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 228 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)32S/12E-24B02 North Beach Campground - MiddlePaso Robles 1/29/1970 Stove Pipe Top of PVC Casing 13.418.085.3332S/12E-24B02 North Beach Campground - MiddlePaso Robles 10/3/1969 Stove Pipe Top of PVC Casing 13.417.376.0432S/12E-24B02 North Beach Campground - MiddlePaso Robles 7/23/1969 Stove Pipe Top of PVC Casing 13.416.706.7132S/12E-24B02 North Beach Campground - MiddlePaso Robles 6/24/1969 Stove Pipe Top of PVC Casing 13.416.706.7132S/12E-24B02 North Beach Campground - MiddlePaso Robles 5/22/1969 Stove Pipe Top of PVC Casing 13.416.706.7132S/12E-24B02 North Beach Campground - MiddlePaso Robles 4/18/1969 Stove Pipe Top of PVC Casing 13.418.125.2932S/12E-24B02 North Beach Campground - MiddlePaso Robles 1/15/1969 Stove Pipe Top of PVC Casing 13.418.155.2632S/12E-24B02 North Beach Campground - MiddlePaso Robles 12/12/1968 Stove Pipe Top of PVC Casing 13.417.705.7132S/12E-24B02 North Beach Campground - MiddlePaso Robles 11/14/1968 Stove Pipe Top of PVC Casing 13.411.9711.4432S/12E-24B02 North Beach Campground - MiddlePaso Robles 10/17/1968 Stove Pipe Top of PVC Casing 13.417.445.9732S/12E-24B02 North Beach Campground - MiddlePaso Robles 9/14/1968 Stove Pipe Top of PVC Casing 13.416.456.9632S/12E-24B02 North Beach Campground - MiddlePaso Robles 8/13/1968 Stove Pipe Top of PVC Casing 13.417.186.2332S/12E-24B02 North Beach Campground - MiddlePaso Robles 7/22/1968 Stove Pipe Top of PVC Casing 13.417.056.3632S/12E-24B02 North Beach Campground - MiddlePaso Robles 6/24/1968 Stove Pipe Top of PVC Casing 13.417.206.2132S/12E-24B02 North Beach Campground - MiddlePaso Robles 5/30/1968 Stove Pipe Top of PVC Casing 13.416.057.3632S/12E-24B02 North Beach Campground - MiddlePaso Robles 4/20/1968 Stove Pipe Top of PVC Casing 13.417.655.7632S/12E-24B02 North Beach Campground - MiddlePaso Robles 3/21/1968 Stove Pipe Top of PVC Casing 13.418.195.2232S/12E-24B02 North Beach Campground - MiddlePaso Robles 2/22/1968 Stove Pipe Top of PVC Casing 13.418.385.0332S/12E-24B02 North Beach Campground - MiddlePaso Robles 1/17/1968 Stove Pipe Top of PVC Casing 13.418.954.4632S/12E-24B02 North Beach Campground - MiddlePaso Robles 12/8/1967 Stove Pipe Top of PVC Casing 13.418.255.1632S/12E-24B02 North Beach Campground - MiddlePaso Robles 11/13/1967 Stove Pipe Top of PVC Casing 13.417.755.6632S/12E-24B02 North Beach Campground - MiddlePaso Robles 10/11/1967 Stove Pipe Top of PVC Casing 13.417.006.4132S/12E-24B02 North Beach Campground - MiddlePaso Robles 9/5/1967 Stove Pipe Top of PVC Casing 13.417.495.9232S/12E-24B02 North Beach Campground - MiddlePaso Robles 8/8/1967 Stove Pipe Top of PVC Casing 13.417.366.0532S/12E-24B02 North Beach Campground - MiddlePaso Robles 7/12/1967 Stove Pipe Top of PVC Casing 13.417.995.4232S/12E-24B02 North Beach Campground - MiddlePaso Robles 6/1/1967 Stove Pipe Top of PVC Casing 13.418.504.9132S/12E-24B02 North Beach Campground - MiddlePaso Robles 5/2/1967 Stove Pipe Top of PVC Casing 13.418.504.91P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 229 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)32S/12E-24B03 North Beach Campground - DeepCareaga 10/10/2023 Stove Pipe Top of PVC Casing 13.3311.721.6132S/12E-24B03 North Beach Campground - DeepCareaga7/4/2023 Stove Pipe Top of PVC Casing 13.3311.351.9832S/12E-24B03 North Beach Campground - DeepCareaga4/11/2023 Stove Pipe Top of PVC Casing 13.3310.992.3432S/12E-24B03 North Beach Campground - DeepCareaga2/7/2023 Stove Pipe Top of PVC Casing 13.3310.892.4432S/12E-24B03 North Beach Campground - DeepCareaga10/3/2022 Stove Pipe Top of PVC Casing 13.339.154.1832S/12E-24B03 North Beach Campground - DeepCareaga7/11/2022 Stove Pipe Top of PVC Casing 13.338.544.7932S/12E-24B03 North Beach Campground - DeepCareaga4/5/2022 Stove Pipe Top of PVC Casing 13.339.224.1132S/12E-24B03 North Beach Campground - DeepCareaga1/4/2022 Stove Pipe Top of PVC Casing 13.3310.692.6432S/12E-24B03 North Beach Campground - DeepCareaga10/5/2021 Stove Pipe Top of PVC Casing 13.339.563.7732S/12E-24B03 North Beach Campground - DeepCareaga7/13/2021 Stove Pipe Top of PVC Casing 13.339.254.0832S/12E-24B03 North Beach Campground - DeepCareaga4/6/2021 Stove Pipe Top of PVC Casing 13.3310.253.0832S/12E-24B03 North Beach Campground - DeepCareaga1/6/2021 Stove Pipe Top of PVC Casing 13.3311.122.2132S/12E-24B03 North Beach Campground - DeepCareaga10/7/2020 Stove Pipe Top of PVC Casing 13.339.423.9132S/12E-24B03 North Beach Campground - DeepCareaga7/6/2020 Stove Pipe Top of PVC Casing 13.3310.582.7532S/12E-24B03 North Beach Campground - DeepCareaga4/7/2020 Stove Pipe Top of PVC Casing 13.3311.361.9732S/12E-24B03 North Beach Campground - DeepCareaga1/7/2020 Stove Pipe Top of PVC Casing 13.3310.812.5232S/12E-24B03 North Beach Campground - DeepCareaga10/9/2019 Stove Pipe Top of PVC Casing 13.3310.223.1132S/12E-24B03 North Beach Campground - DeepCareaga7/9/2019 Stove Pipe Top of PVC Casing 13.3310.193.1432S/12E-24B03 North Beach Campground - DeepCareaga4/9/2019 Stove Pipe Top of PVC Casing 13.3310.502.8332S/12E-24B03 North Beach Campground - DeepCareaga1/8/2019 Stove Pipe Top of PVC Casing 13.3310.462.8732S/12E-24B03 North Beach Campground - DeepCareaga10/9/2018 Stove Pipe Top of PVC Casing 13.339.783.5532S/12E-24B03 North Beach Campground - DeepCareaga7/10/2018 Stove Pipe Top of PVC Casing 13.339.403.9332S/12E-24B03 North Beach Campground - DeepCareaga4/10/2018 Stove Pipe Top of PVC Casing 13.3311.032.3032S/12E-24B03 North Beach Campground - DeepCareaga1/10/2018 Stove Pipe Top of PVC Casing 13.3311.072.2632S/12E-24B03 North Beach Campground - DeepCareaga 10/10/2017 Stove Pipe Top of PVC Casing 13.339.983.3532S/12E-24B03 North Beach Campground - DeepCareaga7/11/2017 Stove Pipe Top of PVC Casing 13.339.833.5032S/12E-24B03 North Beach Campground - DeepCareaga4/11/2017 Stove Pipe Top of PVC Casing 13.3310.682.6532S/12E-24B03 North Beach Campground - DeepCareaga1/10/2017 Stove Pipe Top of PVC Casing 13.3310.992.3432S/12E-24B03 North Beach Campground - DeepCareaga 10/12/2016 Stove Pipe Top of PVC Casing 13.338.884.4532S/12E-24B03 North Beach Campground - DeepCareaga7/19/2016 Stove Pipe Top of PVC Casing 13.338.484.8532S/12E-24B03 North Beach Campground - DeepCareaga4/12/2016 Stove Pipe Top of PVC Casing 13.339.773.5632S/12E-24B03 North Beach Campground - DeepCareaga1/12/2016 Stove Pipe Top of PVC Casing 13.3310.572.7632S/12E-24B03 North Beach Campground - DeepCareaga 10/13/2015 Stove Pipe Top of PVC Casing 13.338.964.3732S/12E-24B03 North Beach Campground - DeepCareaga7/14/2015 Stove Pipe Top of PVC Casing 13.338.824.5132S/12E-24B03 North Beach Campground - DeepCareaga4/14/2015 Stove Pipe Top of PVC Casing 13.338.724.6132S/12E-24B03 North Beach Campground - DeepCareaga1/13/2015 Stove Pipe Top of PVC Casing 13.339.993.3432S/12E-24B03 North Beach Campground - DeepCareaga 10/14/2014 Stove Pipe Top of PVC Casing 13.338.984.3532S/12E-24B03 North Beach Campground - DeepCareaga7/29/2014 Stove Pipe Top of PVC Casing 13.338.804.5332S/12E-24B03 North Beach Campground - DeepCareaga6/4/2014 Stove Pipe Top of PVC Casing 13.336.257.0832S/12E-24B03 North Beach Campground - DeepCareaga5/5/2014 Stove Pipe Top of PVC Casing 13.338.225.1132S/12E-24B03 North Beach Campground - DeepCareaga4/15/2014 Stove Pipe Top of PVC Casing 13.339.643.6932S/12E-24B03 North Beach Campground - DeepCareaga1/14/2014 Stove Pipe Top of PVC Casing 13.339.773.5632S/12E-24B03 North Beach Campground - DeepCareaga 10/14/2013 Stove Pipe Top of PVC Casing 13.339.084.2532S/12E-24B03 North Beach Campground - DeepCareaga7/9/2013 Stove Pipe Top of PVC Casing 13.339.104.2332S/12E-24B03 North Beach Campground - DeepCareaga4/10/2013 Stove Pipe Top of PVC Casing 13.3310.173.16P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 230 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)32S/12E-24B03 North Beach Campground - DeepCareaga1/14/2013 Stove Pipe Top of PVC Casing 13.3311.102.2332S/12E-24B03 North Beach Campground - DeepCareaga 10/29/2012 Stove Pipe Top of PVC Casing 13.3310.572.7632S/12E-24B03 North Beach Campground - DeepCareaga7/23/2012 Stove Pipe Top of PVC Casing 13.3310.602.7332S/12E-24B03 North Beach Campground - DeepCareaga4/18/2012 Stove Pipe Top of PVC Casing 13.3311.651.6832S/12E-24B03 North Beach Campground - DeepCareaga1/12/2012 Stove Pipe Top of PVC Casing 13.3311.431.9032S/12E-24B03 North Beach Campground - DeepCareaga 11/21/2011 Stove Pipe Top of PVC Casing 13.3310.652.6832S/12E-24B03 North Beach Campground - DeepCareaga7/26/2011 Stove Pipe Top of PVC Casing 13.3310.412.9232S/12E-24B03 North Beach Campground - DeepCareaga4/20/2011 Stove Pipe Top of PVC Casing 13.3310.333.0032S/12E-24B03 North Beach Campground - DeepCareaga1/24/2011 Stove Pipe Top of PVC Casing 13.3310.932.4032S/12E-24B03 North Beach Campground - DeepCareaga 10/21/2010 Stove Pipe Top of PVC Casing 13.338.984.3532S/12E-24B03 North Beach Campground - DeepCareaga7/27/2010 Stove Pipe Top of PVC Casing 13.339.044.2932S/12E-24B03 North Beach Campground - DeepCareaga4/27/2010 Stove Pipe Top of PVC Casing 13.339.274.0632S/12E-24B03 North Beach Campground - DeepCareaga1/27/2010 Stove Pipe Top of PVC Casing 13.339.763.5732S/12E-24B03 North Beach Campground - DeepCareaga 10/19/2009 Stove Pipe Top of PVC Casing 13.339.893.4432S/12E-24B03 North Beach Campground - DeepCareaga8/19/2009 Stove Pipe Top of PVC Casing 13.336.526.8132S/12E-24B03 North Beach Campground - DeepCareaga5/12/2009 Stove Pipe Top of PVC Casing 13.337.525.8132S/12E-24B03 North Beach Campground - DeepCareaga 10/15/2008 Stove Pipe Top of PVC Casing 13.337.575.7632S/12E-24B03 North Beach Campground - DeepCareaga4/15/2008 Stove Pipe Top of PVC Casing 13.336.906.4332S/12E-24B03 North Beach Campground - DeepCareaga 10/18/2007 Stove Pipe Top of PVC Casing 13.335.308.0332S/12E-24B03 North Beach Campground - DeepCareaga4/17/2007 Stove Pipe Top of PVC Casing 13.336.906.4332S/12E-24B03 North Beach Campground - DeepCareaga 10/19/2006 Stove Pipe Top of PVC Casing 13.338.255.0832S/12E-24B03 North Beach Campground - DeepCareaga4/25/2006 Stove Pipe Top of PVC Casing 13.3310.552.7832S/12E-24B03 North Beach Campground - DeepCareaga10/7/2005 Stove Pipe Top of PVC Casing 13.337.505.8332S/12E-24B03 North Beach Campground - DeepCareaga4/28/2005 Stove Pipe Top of PVC Casing 13.337.555.7832S/12E-24B03 North Beach Campground - DeepCareaga 10/27/2004 Stove Pipe Top of PVC Casing 13.336.706.6332S/12E-24B03 North Beach Campground - DeepCareaga4/8/2004 Stove Pipe Top of PVC Casing 13.339.803.5332S/12E-24B03 North Beach Campground - DeepCareaga 10/14/2002 Stove Pipe Top of PVC Casing 13.337.905.4332S/12E-24B03 North Beach Campground - DeepCareaga4/9/2002 Stove Pipe Top of PVC Casing 13.337.805.5332S/12E-24B03 North Beach Campground - DeepCareaga10/5/2001 Stove Pipe Top of PVC Casing 13.3310.502.8332S/12E-24B03 North Beach Campground - DeepCareaga4/23/2001 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga4/24/2000 Stove Pipe Top of PVC Casing 13.338.005.3332S/12E-24B03 North Beach Campground - DeepCareaga 10/29/1999 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga4/15/1999 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga 10/20/1998 Stove Pipe Top of PVC Casing 13.338.904.4332S/12E-24B03 North Beach Campground - DeepCareaga 10/29/1997 Stove Pipe Top of PVC Casing 13.338.554.7832S/12E-24B03 North Beach Campground - DeepCareaga4/29/1997 Stove Pipe Top of PVC Casing 13.338.025.3132S/12E-24B03 North Beach Campground - DeepCareaga 10/23/1996 Stove Pipe Top of PVC Casing 13.337.026.3132S/12E-24B03 North Beach Campground - DeepCareaga4/29/1996 Stove Pipe Top of PVC Casing 13.339.104.2332S/12E-24B03 North Beach Campground - DeepCareaga 10/10/1995 Stove Pipe Top of PVC Casing 13.337.905.4332S/12E-24B03 North Beach Campground - DeepCareaga4/19/1995 Stove Pipe Top of PVC Casing 13.3310.203.1332S/12E-24B03 North Beach Campground - DeepCareaga11/1/1994 Stove Pipe Top of PVC Casing 13.337.755.5832S/12E-24B03 North Beach Campground - DeepCareaga4/11/1994 Stove Pipe Top of PVC Casing 13.339.393.9432S/12E-24B03 North Beach Campground - DeepCareaga 10/13/1993 Stove Pipe Top of PVC Casing 13.338.424.9132S/12E-24B03 North Beach Campground - DeepCareaga4/8/1993 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga11/4/1992 Stove Pipe Top of PVC Casing 13.336.406.93P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 231 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)32S/12E-24B03 North Beach Campground - DeepCareaga4/21/1992 Stove Pipe Top of PVC Casing 13.339.004.3332S/12E-24B03 North Beach Campground - DeepCareaga 10/11/1991 Stove Pipe Top of PVC Casing 13.337.106.2332S/12E-24B03 North Beach Campground - DeepCareaga4/19/1991 Stove Pipe Top of PVC Casing 13.337.965.3732S/12E-24B03 North Beach Campground - DeepCareaga 10/11/1990 Stove Pipe Top of PVC Casing 13.338.055.2832S/12E-24B03 North Beach Campground - DeepCareaga4/24/1990 Stove Pipe Top of PVC Casing 13.338.315.0232S/12E-24B03 North Beach Campground - DeepCareaga10/4/1989 Stove Pipe Top of PVC Casing 13.338.484.8532S/12E-24B03 North Beach Campground - DeepCareaga4/17/1989 Stove Pipe Top of PVC Casing 13.337.975.3632S/12E-24B03 North Beach Campground - DeepCareaga 10/20/1988 Stove Pipe Top of PVC Casing 13.338.085.2532S/12E-24B03 North Beach Campground - DeepCareaga4/29/1988 Stove Pipe Top of PVC Casing 13.338.444.8932S/12E-24B03 North Beach Campground - DeepCareaga 10/19/1987 Stove Pipe Top of PVC Casing 13.337.345.9932S/12E-24B03 North Beach Campground - DeepCareaga4/13/1987 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga 10/31/1986 Stove Pipe Top of PVC Casing 13.337.525.8132S/12E-24B03 North Beach Campground - DeepCareaga4/27/1986 Stove Pipe Top of PVC Casing 13.337.635.7032S/12E-24B03 North Beach Campground - DeepCareaga 10/18/1985 Stove Pipe Top of PVC Casing 13.339.883.4532S/12E-24B03 North Beach Campground - DeepCareaga4/22/1985 Stove Pipe Top of PVC Casing 13.3310.303.0332S/12E-24B03 North Beach Campground - DeepCareaga 10/29/1984 Stove Pipe Top of PVC Casing 13.339.014.3232S/12E-24B03 North Beach Campground - DeepCareaga 10/19/1981 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga4/21/1981 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga 10/21/1980 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga5/9/1980 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga11/7/1979 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga4/17/1979 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga12/4/1978 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga5/4/1978 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga11/7/1977 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga5/17/1977 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga6/9/1976 Stove Pipe Top of PVC Casing 13.338.804.5332S/12E-24B03 North Beach Campground - DeepCareaga5/21/1976 Stove Pipe Top of PVC Casing 13.339.373.9632S/12E-24B03 North Beach Campground - DeepCareaga1/14/1976 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga7/7/1975 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga4/1/1975 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga6/7/1974 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga9/20/1973 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga6/29/1972 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga2/29/1972 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga 11/29/1971 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga8/28/1971 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga6/2/1971 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga3/2/1971 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga 12/15/1970 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga8/4/1970 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga6/3/1970 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga3/27/1970 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga1/29/1970 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga10/3/1969 Stove Pipe Top of PVC Casing 13.3310.702.63P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 232 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)32S/12E-24B03 North Beach Campground - DeepCareaga7/23/1969 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga6/24/1969 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga5/22/1969 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga4/18/1969 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga2/21/1969 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga1/15/1969 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga 12/12/1968 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga 11/14/1968 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga 10/17/1968 Stove Pipe Top of PVC Casing 13.339.983.3532S/12E-24B03 North Beach Campground - DeepCareaga9/14/1968 Stove Pipe Top of PVC Casing 13.3310.103.2332S/12E-24B03 North Beach Campground - DeepCareaga8/13/1968 Stove Pipe Top of PVC Casing 13.3310.422.9132S/12E-24B03 North Beach Campground - DeepCareaga7/22/1968 Stove Pipe Top of PVC Casing 13.3310.223.1132S/12E-24B03 North Beach Campground - DeepCareaga6/24/1968 Stove Pipe Top of PVC Casing 13.3310.382.9532S/12E-24B03 North Beach Campground - DeepCareaga5/30/1968 Stove Pipe Top of PVC Casing 13.3310.323.0132S/12E-24B03 North Beach Campground - DeepCareaga4/20/1968 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga3/21/1968 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga2/22/1968 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga1/17/1968 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga12/8/1967 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga 11/13/1967 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga 10/11/1967 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga9/5/1967 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga8/8/1967 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga7/12/1967 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga6/1/1967 Stove Pipe Top of PVC Casing 13.3310.702.6332S/12E-24B03 North Beach Campground - DeepCareaga5/2/1967 Stove Pipe Top of PVC Casing 13.3310.702.63P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 233 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)32S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 10/10/2023 Stove Pipe Top of PVC Casing 22.769.8812.8832S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 7/4/2023 Stove Pipe Top of PVC Casing 22.7610.6412.1232S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 4/11/2023 Stove Pipe Top of PVC Casing 22.7611.1611.6032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 2/7/2023 Stove Pipe Top of PVC Casing 22.769.5613.2032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 10/3/2022 Stove Pipe Top of PVC Casing 22.766.5416.2232S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 7/11/2022 Stove Pipe Top of PVC Casing 22.766.8715.8932S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 4/5/2022 Stove Pipe Top of PVC Casing 22.768.1814.5832S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 1/4/2022 Stove Pipe Top of PVC Casing 22.768.4814.2832S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 10/5/2021 Stove Pipe Top of PVC Casing 22.766.9515.8132S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 7/13/2021 Stove Pipe Top of PVC Casing 22.767.8014.9632S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 4/6/2021 Stove Pipe Top of PVC Casing 22.769.1013.6632S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 1/6/2021 Stove Pipe Top of PVC Casing 22.768.2614.5032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 10/7/2020 Stove Pipe Top of PVC Casing 22.768.2714.4932S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 7/6/2020 Stove Pipe Top of PVC Casing 22.769.1813.5832S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 4/7/2020 Stove Pipe Top of PVC Casing 22.7610.1212.6432S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 1/7/2020 Stove Pipe Top of PVC Casing 22.769.3613.4032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 10/9/2019 Stove Pipe Top of PVC Casing 22.768.3814.3832S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 7/9/2019 Stove Pipe Top of PVC Casing 22.769.5613.2032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 4/9/2019 Stove Pipe Top of PVC Casing 22.7610.1312.6332S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 1/8/2019 Stove Pipe Top of PVC Casing 22.768.6214.1432S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 10/9/2018 Stove Pipe Top of PVC Casing 22.767.9314.8332S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 7/10/2018 Stove Pipe Top of PVC Casing 22.768.3514.4132S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 4/10/2018 Stove Pipe Top of PVC Casing 22.769.1313.6332S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 1/10/2018 Stove Pipe Top of PVC Casing 22.768.7614.0032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 10/10/2017 Stove Pipe Top of PVC Casing 22.768.5114.2532S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 7/11/2017 Stove Pipe Top of PVC Casing 22.769.4313.3332S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 4/11/2017 Stove Pipe Top of PVC Casing 22.769.9112.8532S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 1/10/2017 Stove Pipe Top of PVC Casing 22.769.1713.5932S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 10/12/2016 Stove Pipe Top of PVC Casing 22.766.0816.6832S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 7/19/2016 Stove Pipe Top of PVC Casing 22.766.7416.0232S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 4/12/2016 Stove Pipe Top of PVC Casing 22.768.3314.4332S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 1/12/2016 Stove Pipe Top of PVC Casing 22.768.1614.6032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 10/13/2015 Stove Pipe Top of PVC Casing 22.766.0516.7132S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 7/14/2015 Stove Pipe Top of PVC Casing 22.766.2316.5332S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 4/14/2015 Stove Pipe Top of PVC Casing 22.767.1515.6132S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 1/13/2015 Stove Pipe Top of PVC Casing 22.767.7515.0132S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 10/14/2014 Stove Pipe Top of PVC Casing 22.766.1116.6532S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 7/29/2014 Stove Pipe Top of PVC Casing 22.766.0516.7132S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 6/4/2014 Stove Pipe Top of PVC Casing 22.766.3416.4232S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 4/15/2014 Stove Pipe Top of PVC Casing 22.767.6015.1632S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 1/14/2014 Stove Pipe Top of PVC Casing 22.766.5816.1832S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 10/14/2013 Stove Pipe Top of PVC Casing 22.766.0916.6732S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 7/9/2013 Stove Pipe Top of PVC Casing 22.766.9915.7732S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 4/10/2013 Stove Pipe Top of PVC Casing 22.768.5814.1832S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 1/14/2013 Stove Pipe Top of PVC Casing 22.768.8013.96P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 234 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)32S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 10/30/2012 Stove Pipe Top of PVC Casing 22.768.2114.5532S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 7/24/2012 Stove Pipe Top of PVC Casing 22.769.1613.6032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 4/18/2012 Stove Pipe Top of PVC Casing 22.769.7413.0232S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 1/10/2012 Stove Pipe Top of PVC Casing 22.769.3613.4032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 11/21/2011 Stove Pipe Top of PVC Casing 22.769.3813.3832S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 7/26/2011 Stove Pipe Top of PVC Casing 22.769.6613.1032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 4/20/2011 Stove Pipe Top of PVC Casing 22.7610.3412.4232S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 1/24/2011 Stove Pipe Top of PVC Casing 22.769.8312.9332S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 10/21/2010 Stove Pipe Top of PVC Casing 22.766.6116.1532S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 7/26/2010 Stove Pipe Top of PVC Casing 22.767.4815.2832S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 4/27/2010 Stove Pipe Top of PVC Casing 22.7612.1410.6232S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 1/28/2010 Stove Pipe Top of PVC Casing 22.7610.4312.3332S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 10/19/2009 Stove Pipe Top of PVC Casing 22.768.8313.9332S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 8/19/2009 Stove Pipe Top of PVC Casing 22.768.8213.9432S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 5/12/2009 Stove Pipe Top of PVC Casing 22.7610.7811.9832S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 4/7/2009 Stove Pipe Top of PVC Casing 22.7611.4911.2732S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 10/15/2008 Stove Pipe Top of PVC Casing 22.767.6315.1332S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 10/19/2006 Stove Pipe Top of PVC Casing 22.7610.7112.0532S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 4/25/2006 Stove Pipe Top of PVC Casing 22.7611.6111.1532S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 10/7/2005 Stove Pipe Top of PVC Casing 22.7610.4112.3532S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 4/28/2005 Stove Pipe Top of PVC Casing 22.7612.919.8532S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 10/27/2004 Stove Pipe Top of PVC Casing 22.768.9613.8032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 4/8/2004 Stove Pipe Top of PVC Casing 22.7612.2610.5032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 10/8/2003 Stove Pipe Top of PVC Casing 22.768.2614.5032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 10/14/2002 Stove Pipe Top of PVC Casing 22.768.9613.8032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 4/9/2002 Stove Pipe Top of PVC Casing 22.7613.169.6032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 10/5/2001 Stove Pipe Top of PVC Casing 22.7611.6611.1032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 4/23/2001 Stove Pipe Top of PVC Casing 22.7614.268.5032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 10/16/2000 Stove Pipe Top of PVC Casing 22.7611.5611.2032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 4/24/2000 Stove Pipe Top of PVC Casing 22.7613.169.6032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 10/29/1999 Stove Pipe Top of PVC Casing 22.7611.6611.1032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 4/15/1999 Stove Pipe Top of PVC Casing 22.7614.768.0032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 10/20/1998 Stove Pipe Top of PVC Casing 22.7612.4610.3032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 4/23/1998 Stove Pipe Top of PVC Casing 22.7614.368.4032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 10/22/1997 Stove Pipe Top of PVC Casing 22.7611.0911.6732S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 4/29/1997 Stove Pipe Top of PVC Casing 22.7612.959.8132S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 10/23/1996 Stove Pipe Top of PVC Casing 22.7611.4611.3032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 4/29/1996 Stove Pipe Top of PVC Casing 22.7612.6610.1032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 10/11/1995 Stove Pipe Top of PVC Casing 22.7611.4611.3032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 4/19/1995 Stove Pipe Top of PVC Casing 22.7613.968.8032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 11/1/1994 Stove Pipe Top of PVC Casing 22.7610.6612.1032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 4/11/1994 Stove Pipe Top of PVC Casing 22.7612.2610.5032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 10/13/1993 Stove Pipe Top of PVC Casing 22.7611.3011.4632S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 4/8/1993 Stove Pipe Top of PVC Casing 22.7613.159.6132S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 11/4/1992 Stove Pipe Top of PVC Casing 22.7610.6612.10P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 235 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)32S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 4/21/1992 Stove Pipe Top of PVC Casing 22.7612.4610.3032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 10/11/1991 Stove Pipe Top of PVC Casing 22.769.7912.9732S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 4/19/1991 Stove Pipe Top of PVC Casing 22.7611.1111.6532S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 10/11/1990 Stove Pipe Top of PVC Casing 22.768.2614.5032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 4/24/1990 Stove Pipe Top of PVC Casing 22.7610.8111.9532S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 10/4/1989 Stove Pipe Top of PVC Casing 22.769.6413.1232S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 4/17/1989 Stove Pipe Top of PVC Casing 22.7611.3411.4232S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 10/20/1988 Stove Pipe Top of PVC Casing 22.769.8012.9632S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 4/29/1988 Stove Pipe Top of PVC Casing 22.7611.5011.2632S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 4/21/1988 Stove Pipe Top of PVC Casing 22.7611.4311.3332S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 10/19/1987 Stove Pipe Top of PVC Casing 22.7610.0712.6932S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 4/13/1987 Stove Pipe Top of PVC Casing 22.7611.8510.9132S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 10/31/1986 Stove Pipe Top of PVC Casing 22.7610.9711.7932S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 4/15/1986 Stove Pipe Top of PVC Casing 22.7612.1110.6532S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 10/18/1985 Stove Pipe Top of PVC Casing 22.7610.0112.7532S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 4/22/1985 Stove Pipe Top of PVC Casing 22.7612.0610.7032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 10/15/1984 Stove Pipe Top of PVC Casing 22.7611.8410.9232S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 10/28/1983 Stove Pipe Top of PVC Casing 22.7613.119.6532S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 5/6/1982 Stove Pipe Top of PVC Casing 22.7613.029.7432S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 10/19/1981 Stove Pipe Top of PVC Casing 22.7611.7311.0332S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 4/21/1981 Stove Pipe Top of PVC Casing 22.7613.129.6432S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 10/10/1980 Stove Pipe Top of PVC Casing 22.7611.7611.0032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 5/9/1980 Stove Pipe Top of PVC Casing 22.7612.6310.1332S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 11/7/1979 Stove Pipe Top of PVC Casing 22.7611.9510.8132S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 4/17/1979 Stove Pipe Top of PVC Casing 22.7612.979.7932S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 12/4/1978 Stove Pipe Top of PVC Casing 22.7612.7510.0132S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 4/24/1978 Stove Pipe Top of PVC Casing 22.7613.669.1032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 11/7/1977 Stove Pipe Top of PVC Casing 22.7610.1912.5732S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 5/17/1977 Stove Pipe Top of PVC Casing 22.7611.0711.6932S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 6/9/1976 Stove Pipe Top of PVC Casing 22.7610.9111.8532S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 1/14/1976 Stove Pipe Top of PVC Casing 22.7611.7611.0032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 1/4/1976 Stove Pipe Top of PVC Casing 22.7612.1610.6032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 7/7/1975 Stove Pipe Top of PVC Casing 22.769.7413.0232S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 4/1/1975 Stove Pipe Top of PVC Casing 22.7613.169.6032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 6/7/1974 Stove Pipe Top of PVC Casing 22.7613.169.6032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 4/1/1974 Stove Pipe Top of PVC Casing 22.7612.6610.1032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 7/20/1973 Stove Pipe Top of PVC Casing 22.7611.4911.2732S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 6/29/1972 Stove Pipe Top of PVC Casing 22.767.1615.6032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 2/23/1972 Stove Pipe Top of PVC Casing 22.7613.169.6032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 11/29/1971 Stove Pipe Top of PVC Casing 22.7612.0610.7032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 8/26/1971 Stove Pipe Top of PVC Casing 22.7611.7311.0332S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 6/2/1971 Stove Pipe Top of PVC Casing 22.7612.2210.5432S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 3/2/1971 Stove Pipe Top of PVC Casing 22.7612.879.8932S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 12/15/1970 Stove Pipe Top of PVC Casing 22.7612.6010.1632S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 8/4/1970 Stove Pipe Top of PVC Casing 22.764.1618.60P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 236 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)32S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 6/3/1970 Stove Pipe Top of PVC Casing 22.769.1613.6032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 3/27/1970 Stove Pipe Top of PVC Casing 22.7611.0911.6732S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 1/29/1970 Stove Pipe Top of PVC Casing 22.7611.3611.4032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 10/3/1969 Stove Pipe Top of PVC Casing 22.768.5614.2032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 7/23/1969 Stove Pipe Top of PVC Casing 22.769.4113.3532S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 6/24/1969 Stove Pipe Top of PVC Casing 22.7610.2312.5332S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 5/22/1969 Stove Pipe Top of PVC Casing 22.7611.0011.7632S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 4/18/1969 Stove Pipe Top of PVC Casing 22.7611.9210.8432S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 3/20/1969 Stove Pipe Top of PVC Casing 22.7612.839.9332S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 2/21/1969 Stove Pipe Top of PVC Casing 22.7611.5311.2332S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 1/15/1969 Stove Pipe Top of PVC Casing 22.769.5613.2032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 12/12/1968 Stove Pipe Top of PVC Casing 22.768.0914.6732S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 11/14/1968 Stove Pipe Top of PVC Casing 22.766.8815.8832S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 10/17/1968 Stove Pipe Top of PVC Casing 22.765.7916.9732S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 9/14/1968 Stove Pipe Top of PVC Casing 22.764.3618.4032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 8/13/1968 Stove Pipe Top of PVC Casing 22.765.2017.5632S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 7/22/1968 Stove Pipe Top of PVC Casing 22.765.4617.3032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 6/24/1968 Stove Pipe Top of PVC Casing 22.766.2116.5532S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 5/30/1968 Stove Pipe Top of PVC Casing 22.7617.695.0732S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 4/20/1968 Stove Pipe Top of PVC Casing 22.769.6513.1132S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 3/21/1968 Stove Pipe Top of PVC Casing 22.7611.0611.7032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 2/22/1968 Stove Pipe Top of PVC Casing 22.7610.8711.8932S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 1/17/1968 Stove Pipe Top of PVC Casing 22.7610.4912.2732S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 12/8/1967 Stove Pipe Top of PVC Casing 22.769.7912.9732S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 11/13/1967 Stove Pipe Top of PVC Casing 22.767.8014.9632S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 10/9/1967 Stove Pipe Top of PVC Casing 22.767.7515.0132S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 9/5/1967 Stove Pipe Top of PVC Casing 22.767.8214.9432S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 8/8/1967 Stove Pipe Top of PVC Casing 22.768.1214.6432S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 7/12/1967 Stove Pipe Top of PVC Casing 22.768.8713.8932S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 6/1/1967 Stove Pipe Top of PVC Casing 22.769.9612.8032S/13E-30F01Highway 1 - ShallowAlluvium/ Paso Robles 5/2/1967 Stove Pipe Top of PVC Casing 22.7610.9611.80P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 237 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)32S/13E-30F02Highway 1 - MiddlePaso Robles 10/10/2023 Stove Pipe Top of PVC Casing 22.799.1913.6032S/13E-30F02Highway 1 - MiddlePaso Robles 7/4/2023 Stove Pipe Top of PVC Casing 22.799.0313.7632S/13E-30F02Highway 1 - MiddlePaso Robles 4/11/2023 Stove Pipe Top of PVC Casing 22.799.3913.4032S/13E-30F02Highway 1 - MiddlePaso Robles 2/7/2023 Stove Pipe Top of PVC Casing 22.798.8213.9732S/13E-30F02Highway 1 - MiddlePaso Robles 10/3/2022 Stove Pipe Top of PVC Casing 22.796.0716.7232S/13E-30F02Highway 1 - MiddlePaso Robles 7/11/2022 Stove Pipe Top of PVC Casing 22.795.9616.8332S/13E-30F02Highway 1 - MiddlePaso Robles 4/5/2022 Stove Pipe Top of PVC Casing 22.796.4116.3832S/13E-30F02Highway 1 - MiddlePaso Robles 1/4/2022 Stove Pipe Top of PVC Casing 22.797.9014.8932S/13E-30F02Highway 1 - MiddlePaso Robles 10/5/2021 Stove Pipe Top of PVC Casing 22.796.7316.0632S/13E-30F02Highway 1 - MiddlePaso Robles 7/13/2021 Stove Pipe Top of PVC Casing 22.796.0716.7232S/13E-30F02Highway 1 - MiddlePaso Robles 4/6/2021 Stove Pipe Top of PVC Casing 22.798.2914.5032S/13E-30F02Highway 1 - MiddlePaso Robles 1/6/2021 Stove Pipe Top of PVC Casing 22.797.2015.5932S/13E-30F02Highway 1 - MiddlePaso Robles 10/7/2020 Stove Pipe Top of PVC Casing 22.797.3715.4232S/13E-30F02Highway 1 - MiddlePaso Robles 7/6/2020 Stove Pipe Top of PVC Casing 22.798.9813.8132S/13E-30F02Highway 1 - MiddlePaso Robles 4/7/2020 Stove Pipe Top of PVC Casing 22.798.9413.8532S/13E-30F02Highway 1 - MiddlePaso Robles 1/7/2020 Stove Pipe Top of PVC Casing 22.798.1714.6232S/13E-30F02Highway 1 - MiddlePaso Robles 10/9/2019 Stove Pipe Top of PVC Casing 22.797.6115.1832S/13E-30F02Highway 1 - MiddlePaso Robles 7/9/2019 Stove Pipe Top of PVC Casing 22.798.2614.5332S/13E-30F02Highway 1 - MiddlePaso Robles 4/9/2019 Stove Pipe Top of PVC Casing 22.798.2914.5032S/13E-30F02Highway 1 - MiddlePaso Robles 1/8/2019 Stove Pipe Top of PVC Casing 22.798.0514.7432S/13E-30F02Highway 1 - MiddlePaso Robles 10/9/2018 Stove Pipe Top of PVC Casing 22.797.2215.5732S/13E-30F02Highway 1 - MiddlePaso Robles 7/10/2018 Stove Pipe Top of PVC Casing 22.797.2615.5332S/13E-30F02Highway 1 - MiddlePaso Robles 4/10/2018 Stove Pipe Top of PVC Casing 22.798.5414.2532S/13E-30F02Highway 1 - MiddlePaso Robles 1/10/2018 Stove Pipe Top of PVC Casing 22.798.3714.4232S/13E-30F02Highway 1 - MiddlePaso Robles 10/10/2017 Stove Pipe Top of PVC Casing 22.797.7115.0832S/13E-30F02Highway 1 - MiddlePaso Robles 7/11/2017 Stove Pipe Top of PVC Casing 22.797.8614.9332S/13E-30F02Highway 1 - MiddlePaso Robles 4/11/2017 Stove Pipe Top of PVC Casing 22.798.8913.9032S/13E-30F02Highway 1 - MiddlePaso Robles 1/10/2017 Stove Pipe Top of PVC Casing 22.798.6314.1632S/13E-30F02Highway 1 - MiddlePaso Robles 10/12/2016 Stove Pipe Top of PVC Casing 22.795.8116.9832S/13E-30F02Highway 1 - MiddlePaso Robles 7/19/2016 Stove Pipe Top of PVC Casing 22.795.5317.2632S/13E-30F02Highway 1 - MiddlePaso Robles 4/12/2016 Stove Pipe Top of PVC Casing 22.797.1815.6132S/13E-30F02Highway 1 - MiddlePaso Robles 1/12/2016 Stove Pipe Top of PVC Casing 22.797.8714.9232S/13E-30F02Highway 1 - MiddlePaso Robles 10/13/2015 Stove Pipe Top of PVC Casing 22.795.8716.9232S/13E-30F02Highway 1 - MiddlePaso Robles 7/14/2015 Stove Pipe Top of PVC Casing 22.795.7217.0732S/13E-30F02Highway 1 - MiddlePaso Robles 4/14/2015 Stove Pipe Top of PVC Casing 22.796.2216.5732S/13E-30F02Highway 1 - MiddlePaso Robles 1/13/2015 Stove Pipe Top of PVC Casing 22.796.7516.0432S/13E-30F02Highway 1 - MiddlePaso Robles 10/14/2014 Stove Pipe Top of PVC Casing 22.795.8316.9632S/13E-30F02Highway 1 - MiddlePaso Robles 7/29/2014 Stove Pipe Top of PVC Casing 22.795.8516.9432S/13E-30F02Highway 1 - MiddlePaso Robles 6/4/2014 Stove Pipe Top of PVC Casing 22.795.1617.6332S/13E-30F02Highway 1 - MiddlePaso Robles 4/15/2014 Stove Pipe Top of PVC Casing 22.796.8915.9032S/13E-30F02Highway 1 - MiddlePaso Robles 1/14/2014 Stove Pipe Top of PVC Casing 22.796.1516.6432S/13E-30F02Highway 1 - MiddlePaso Robles 10/14/2013 Stove Pipe Top of PVC Casing 22.795.6417.1532S/13E-30F02Highway 1 - MiddlePaso Robles 7/9/2013 Stove Pipe Top of PVC Casing 22.796.0116.7832S/13E-30F02Highway 1 - MiddlePaso Robles 4/10/2013 Stove Pipe Top of PVC Casing 22.797.4015.3932S/13E-30F02Highway 1 - MiddlePaso Robles 1/14/2013 Stove Pipe Top of PVC Casing 22.798.1514.64P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 238 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)32S/13E-30F02Highway 1 - MiddlePaso Robles 10/30/2012 Stove Pipe Top of PVC Casing 22.797.8914.9032S/13E-30F02Highway 1 - MiddlePaso Robles 7/24/2012 Stove Pipe Top of PVC Casing 22.798.3414.4532S/13E-30F02Highway 1 - MiddlePaso Robles 4/18/2012 Stove Pipe Top of PVC Casing 22.798.7814.0132S/13E-30F02Highway 1 - MiddlePaso Robles 1/12/2012 Stove Pipe Top of PVC Casing 22.798.8513.9432S/13E-30F02Highway 1 - MiddlePaso Robles 11/21/2011 Stove Pipe Top of PVC Casing 22.798.2214.5732S/13E-30F02Highway 1 - MiddlePaso Robles 7/26/2011 Stove Pipe Top of PVC Casing 22.798.7014.0932S/13E-30F02Highway 1 - MiddlePaso Robles 4/20/2011 Stove Pipe Top of PVC Casing 22.798.9313.8632S/13E-30F02Highway 1 - MiddlePaso Robles 1/24/2011 Stove Pipe Top of PVC Casing 22.798.8013.9932S/13E-30F02Highway 1 - MiddlePaso Robles 10/21/2010 Stove Pipe Top of PVC Casing 22.7915.777.0232S/13E-30F02Highway 1 - MiddlePaso Robles 7/26/2010 Stove Pipe Top of PVC Casing 22.796.9515.8432S/13E-30F02Highway 1 - MiddlePaso Robles 4/27/2010 Stove Pipe Top of PVC Casing 22.798.2214.5732S/13E-30F02Highway 1 - MiddlePaso Robles 1/28/2010 Stove Pipe Top of PVC Casing 22.797.2715.5232S/13E-30F02Highway 1 - MiddlePaso Robles 10/19/2009 Stove Pipe Top of PVC Casing 22.796.0016.7932S/13E-30F02Highway 1 - MiddlePaso Robles 8/19/2009 Stove Pipe Top of PVC Casing 22.795.5517.2432S/13E-30F02Highway 1 - MiddlePaso Robles 5/12/2009 Stove Pipe Top of PVC Casing 22.796.0216.7732S/13E-30F02Highway 1 - MiddlePaso Robles 4/7/2009 Stove Pipe Top of PVC Casing 22.798.0814.7132S/13E-30F02Highway 1 - MiddlePaso Robles 10/15/2008 Stove Pipe Top of PVC Casing 22.795.0217.7732S/13E-30F02Highway 1 - MiddlePaso Robles 4/15/2008 Stove Pipe Top of PVC Casing 22.797.9614.8332S/13E-30F02Highway 1 - MiddlePaso Robles 10/18/2007 Stove Pipe Top of PVC Casing 22.795.0117.7832S/13E-30F02Highway 1 - MiddlePaso Robles 4/17/2007 Stove Pipe Top of PVC Casing 22.797.9314.8632S/13E-30F02Highway 1 - MiddlePaso Robles 10/19/2006 Stove Pipe Top of PVC Casing 22.797.5115.2832S/13E-30F02Highway 1 - MiddlePaso Robles 4/25/2006 Stove Pipe Top of PVC Casing 22.7910.5112.2832S/13E-30F02Highway 1 - MiddlePaso Robles 10/7/2005 Stove Pipe Top of PVC Casing 22.798.2114.5832S/13E-30F02Highway 1 - MiddlePaso Robles 4/28/2005 Stove Pipe Top of PVC Casing 22.799.0113.7832S/13E-30F02Highway 1 - MiddlePaso Robles 10/27/2004 Stove Pipe Top of PVC Casing 22.795.8616.9332S/13E-30F02Highway 1 - MiddlePaso Robles 4/8/2004 Stove Pipe Top of PVC Casing 22.799.9612.8332S/13E-30F02Highway 1 - MiddlePaso Robles 10/14/2002 Stove Pipe Top of PVC Casing 22.796.0616.7332S/13E-30F02Highway 1 - MiddlePaso Robles 4/9/2002 Stove Pipe Top of PVC Casing 22.799.2613.5332S/13E-30F02Highway 1 - MiddlePaso Robles 10/5/2001 Stove Pipe Top of PVC Casing 22.798.0614.7332S/13E-30F02Highway 1 - MiddlePaso Robles 4/23/2001 Stove Pipe Top of PVC Casing 22.7910.2612.5332S/13E-30F02Highway 1 - MiddlePaso Robles 10/16/2000 Stove Pipe Top of PVC Casing 22.798.0614.7332S/13E-30F02Highway 1 - MiddlePaso Robles 4/24/2000 Stove Pipe Top of PVC Casing 22.799.3613.4332S/13E-30F02Highway 1 - MiddlePaso Robles 10/29/1999 Stove Pipe Top of PVC Casing 22.798.1614.6332S/13E-30F02Highway 1 - MiddlePaso Robles 4/15/1999 Stove Pipe Top of PVC Casing 22.7910.0612.7332S/13E-30F02Highway 1 - MiddlePaso Robles 10/20/1998 Stove Pipe Top of PVC Casing 22.799.6613.1332S/13E-30F02Highway 1 - MiddlePaso Robles 4/23/1998 Stove Pipe Top of PVC Casing 22.7912.0610.7332S/13E-30F02Highway 1 - MiddlePaso Robles 10/22/1997 Stove Pipe Top of PVC Casing 22.798.0614.7332S/13E-30F02Highway 1 - MiddlePaso Robles 4/29/1997 Stove Pipe Top of PVC Casing 22.799.1613.6332S/13E-30F02Highway 1 - MiddlePaso Robles 10/23/1996 Stove Pipe Top of PVC Casing 22.798.3114.4832S/13E-30F02Highway 1 - MiddlePaso Robles 4/29/1996 Stove Pipe Top of PVC Casing 22.799.5613.2332S/13E-30F02Highway 1 - MiddlePaso Robles 10/11/1995 Stove Pipe Top of PVC Casing 22.798.4614.3332S/13E-30F02Highway 1 - MiddlePaso Robles 4/19/1995 Stove Pipe Top of PVC Casing 22.7910.3112.4832S/13E-30F02Highway 1 - MiddlePaso Robles 11/1/1994 Stove Pipe Top of PVC Casing 22.796.4616.3332S/13E-30F02Highway 1 - MiddlePaso Robles 4/11/1994 Stove Pipe Top of PVC Casing 22.798.5714.2232S/13E-30F02Highway 1 - MiddlePaso Robles 10/13/1993 Stove Pipe Top of PVC Casing 22.797.6015.19P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 239 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)32S/13E-30F02Highway 1 - MiddlePaso Robles 4/8/1993 Stove Pipe Top of PVC Casing 22.799.8812.9132S/13E-30F02Highway 1 - MiddlePaso Robles 11/4/1992 Stove Pipe Top of PVC Casing 22.797.0615.7332S/13E-30F02Highway 1 - MiddlePaso Robles 4/21/1992 Stove Pipe Top of PVC Casing 22.7910.9111.8832S/13E-30F02Highway 1 - MiddlePaso Robles 10/11/1991 Stove Pipe Top of PVC Casing 22.796.9415.8532S/13E-30F02Highway 1 - MiddlePaso Robles 4/19/1991 Stove Pipe Top of PVC Casing 22.797.3115.4832S/13E-30F02Highway 1 - MiddlePaso Robles 10/11/1990 Stove Pipe Top of PVC Casing 22.795.6517.1432S/13E-30F02Highway 1 - MiddlePaso Robles 4/24/1990 Stove Pipe Top of PVC Casing 22.797.2115.5832S/13E-30F02Highway 1 - MiddlePaso Robles 10/4/1989 Stove Pipe Top of PVC Casing 22.796.6516.1432S/13E-30F02Highway 1 - MiddlePaso Robles 4/17/1989 Stove Pipe Top of PVC Casing 22.795.8616.9332S/13E-30F02Highway 1 - MiddlePaso Robles 10/20/1988 Stove Pipe Top of PVC Casing 22.796.3616.4332S/13E-30F02Highway 1 - MiddlePaso Robles 4/29/1988 Stove Pipe Top of PVC Casing 22.797.5115.2832S/13E-30F02Highway 1 - MiddlePaso Robles 4/21/1988 Stove Pipe Top of PVC Casing 22.797.1315.6632S/13E-30F02Highway 1 - MiddlePaso Robles 10/19/1987 Stove Pipe Top of PVC Casing 22.796.3916.4032S/13E-30F02Highway 1 - MiddlePaso Robles 4/13/1987 Stove Pipe Top of PVC Casing 22.798.4014.3932S/13E-30F02Highway 1 - MiddlePaso Robles 10/31/1986 Stove Pipe Top of PVC Casing 22.797.8014.9932S/13E-30F02Highway 1 - MiddlePaso Robles 4/15/1986 Stove Pipe Top of PVC Casing 22.798.3914.4032S/13E-30F02Highway 1 - MiddlePaso Robles 10/18/1985 Stove Pipe Top of PVC Casing 22.796.9615.8332S/13E-30F02Highway 1 - MiddlePaso Robles 4/22/1985 Stove Pipe Top of PVC Casing 22.798.5614.2332S/13E-30F02Highway 1 - MiddlePaso Robles 10/15/1984 Stove Pipe Top of PVC Casing 22.798.8813.9132S/13E-30F02Highway 1 - MiddlePaso Robles 10/28/1983 Stove Pipe Top of PVC Casing 22.7910.2612.5332S/13E-30F02Highway 1 - MiddlePaso Robles 5/6/1982 Stove Pipe Top of PVC Casing 22.799.4113.3832S/13E-30F02Highway 1 - MiddlePaso Robles 10/19/1981 Stove Pipe Top of PVC Casing 22.798.6614.1332S/13E-30F02Highway 1 - MiddlePaso Robles 4/21/1981 Stove Pipe Top of PVC Casing 22.799.6313.1632S/13E-30F02Highway 1 - MiddlePaso Robles 10/10/1980 Stove Pipe Top of PVC Casing 22.798.6114.1832S/13E-30F02Highway 1 - MiddlePaso Robles 5/9/1980 Stove Pipe Top of PVC Casing 22.798.4814.3132S/13E-30F02Highway 1 - MiddlePaso Robles 11/7/1979 Stove Pipe Top of PVC Casing 22.799.1613.6332S/13E-30F02Highway 1 - MiddlePaso Robles 4/17/1979 Stove Pipe Top of PVC Casing 22.799.1113.6832S/13E-30F02Highway 1 - MiddlePaso Robles 12/4/1978 Stove Pipe Top of PVC Casing 22.799.9112.8832S/13E-30F02Highway 1 - MiddlePaso Robles 4/24/1978 Stove Pipe Top of PVC Casing 22.7910.2112.5832S/13E-30F02Highway 1 - MiddlePaso Robles 11/7/1977 Stove Pipe Top of PVC Casing 22.796.7116.0832S/13E-30F02Highway 1 - MiddlePaso Robles 5/17/1977 Stove Pipe Top of PVC Casing 22.797.1715.6232S/13E-30F02Highway 1 - MiddlePaso Robles 6/9/1976 Stove Pipe Top of PVC Casing 22.797.5615.2332S/13E-30F02Highway 1 - MiddlePaso Robles 1/14/1976 Stove Pipe Top of PVC Casing 22.798.3614.4332S/13E-30F02Highway 1 - MiddlePaso Robles 7/7/1975 Stove Pipe Top of PVC Casing 22.798.3614.4332S/13E-30F02Highway 1 - MiddlePaso Robles 4/1/1975 Stove Pipe Top of PVC Casing 22.7910.3612.4332S/13E-30F02Highway 1 - MiddlePaso Robles 6/7/1974 Stove Pipe Top of PVC Casing 22.799.4213.3732S/13E-30F02Highway 1 - MiddlePaso Robles 9/20/1973 Stove Pipe Top of PVC Casing 22.798.5114.2832S/13E-30F02Highway 1 - MiddlePaso Robles 6/29/1972 Stove Pipe Top of PVC Casing 22.795.3617.4332S/13E-30F02Highway 1 - MiddlePaso Robles 2/23/1972 Stove Pipe Top of PVC Casing 22.799.3613.4332S/13E-30F02Highway 1 - MiddlePaso Robles 11/29/1971 Stove Pipe Top of PVC Casing 22.798.0114.7832S/13E-30F02Highway 1 - MiddlePaso Robles 8/26/1971 Stove Pipe Top of PVC Casing 22.798.2614.5332S/13E-30F02Highway 1 - MiddlePaso Robles 6/2/1971 Stove Pipe Top of PVC Casing 22.798.2114.5832S/13E-30F02Highway 1 - MiddlePaso Robles 3/2/1971 Stove Pipe Top of PVC Casing 22.799.0113.7832S/13E-30F02Highway 1 - MiddlePaso Robles 12/15/1970 Stove Pipe Top of PVC Casing 22.798.9713.8232S/13E-30F02Highway 1 - MiddlePaso Robles 6/3/1970 Stove Pipe Top of PVC Casing 22.795.5517.24P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 240 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)32S/13E-30F02Highway 1 - MiddlePaso Robles 3/27/1970 Stove Pipe Top of PVC Casing 22.796.7116.0832S/13E-30F02Highway 1 - MiddlePaso Robles 1/29/1970 Stove Pipe Top of PVC Casing 22.797.6415.1532S/13E-30F02Highway 1 - MiddlePaso Robles 10/3/1969 Stove Pipe Top of PVC Casing 22.795.5517.2432S/13E-30F02Highway 1 - MiddlePaso Robles 7/23/1969 Stove Pipe Top of PVC Casing 22.795.4617.3332S/13E-30F02Highway 1 - MiddlePaso Robles 6/24/1969 Stove Pipe Top of PVC Casing 22.796.3716.4232S/13E-30F02Highway 1 - MiddlePaso Robles 5/22/1969 Stove Pipe Top of PVC Casing 22.796.5316.2632S/13E-30F02Highway 1 - MiddlePaso Robles 4/18/1969 Stove Pipe Top of PVC Casing 22.797.5815.2132S/13E-30F02Highway 1 - MiddlePaso Robles 3/20/1969 Stove Pipe Top of PVC Casing 22.798.2814.5132S/13E-30F02Highway 1 - MiddlePaso Robles 2/21/1969 Stove Pipe Top of PVC Casing 22.797.7415.0532S/13E-30F02Highway 1 - MiddlePaso Robles 1/15/1969 Stove Pipe Top of PVC Casing 22.795.4417.3532S/13E-30F02Highway 1 - MiddlePaso Robles 11/14/1968 Stove Pipe Top of PVC Casing 22.794.1718.6232S/13E-30F02Highway 1 - MiddlePaso Robles 10/17/1968 Stove Pipe Top of PVC Casing 22.793.0619.7332S/13E-30F02Highway 1 - MiddlePaso Robles 9/14/1968 Stove Pipe Top of PVC Casing 22.792.1820.6132S/13E-30F02Highway 1 - MiddlePaso Robles 8/13/1968 Stove Pipe Top of PVC Casing 22.792.9619.8332S/13E-30F02Highway 1 - MiddlePaso Robles 7/22/1968 Stove Pipe Top of PVC Casing 22.792.9919.8032S/13E-30F02Highway 1 - MiddlePaso Robles 6/24/1968 Stove Pipe Top of PVC Casing 22.793.1919.6032S/13E-30F02Highway 1 - MiddlePaso Robles 5/30/1968 Stove Pipe Top of PVC Casing 22.793.4219.3732S/13E-30F02Highway 1 - MiddlePaso Robles 4/20/1968 Stove Pipe Top of PVC Casing 22.795.1217.6732S/13E-30F02Highway 1 - MiddlePaso Robles 3/21/1968 Stove Pipe Top of PVC Casing 22.795.6617.1332S/13E-30F02Highway 1 - MiddlePaso Robles 2/22/1968 Stove Pipe Top of PVC Casing 22.796.5116.2832S/13E-30F02Highway 1 - MiddlePaso Robles 1/17/1968 Stove Pipe Top of PVC Casing 22.797.0415.7532S/13E-30F02Highway 1 - MiddlePaso Robles 12/22/1967 Stove Pipe Top of PVC Casing 22.796.3716.4232S/13E-30F02Highway 1 - MiddlePaso Robles 11/13/1967 Stove Pipe Top of PVC Casing 22.794.5918.2032S/13E-30F02Highway 1 - MiddlePaso Robles 10/9/1967 Stove Pipe Top of PVC Casing 22.795.3817.4132S/13E-30F02Highway 1 - MiddlePaso Robles 9/5/1967 Stove Pipe Top of PVC Casing 22.795.0417.7532S/13E-30F02Highway 1 - MiddlePaso Robles 8/8/1967 Stove Pipe Top of PVC Casing 22.794.7118.0832S/13E-30F02Highway 1 - MiddlePaso Robles 7/12/1967 Stove Pipe Top of PVC Casing 22.795.4217.3732S/13E-30F02Highway 1 - MiddlePaso Robles 6/1/1967 Stove Pipe Top of PVC Casing 22.795.8616.9332S/13E-30F02Highway 1 - MiddlePaso Robles 5/2/1967 Stove Pipe Top of PVC Casing 22.796.9615.83P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 241 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)32S/13E-30F03Highway 1 - DeepCareaga 10/10/2023 Stove Pipe Top of PVC Casing 22.6611.9910.6732S/13E-30F03Highway 1 - DeepCareaga7/4/2023 Stove Pipe Top of PVC Casing 22.6612.939.7332S/13E-30F03Highway 1 - DeepCareaga4/11/2023 Stove Pipe Top of PVC Casing 22.6613.029.6432S/13E-30F03Highway 1 - DeepCareaga2/7/2023 Stove Pipe Top of PVC Casing 22.6610.4412.2232S/13E-30F03Highway 1 - DeepCareaga10/3/2022 Stove Pipe Top of PVC Casing 22.665.5417.1232S/13E-30F03Highway 1 - DeepCareaga7/11/2022 Stove Pipe Top of PVC Casing 22.664.9917.6732S/13E-30F03Highway 1 - DeepCareaga4/5/2022 Stove Pipe Top of PVC Casing 22.668.0714.5932S/13E-30F03Highway 1 - DeepCareaga1/4/2022 Stove Pipe Top of PVC Casing 22.669.1013.5632S/13E-30F03Highway 1 - DeepCareaga10/5/2021 Stove Pipe Top of PVC Casing 22.666.5216.1432S/13E-30F03Highway 1 - DeepCareaga7/13/2021 Stove Pipe Top of PVC Casing 22.668.0514.6132S/13E-30F03Highway 1 - DeepCareaga4/6/2021 Stove Pipe Top of PVC Casing 22.669.0713.5932S/13E-30F03Highway 1 - DeepCareaga1/6/2021 Stove Pipe Top of PVC Casing 22.669.1213.5432S/13E-30F03Highway 1 - DeepCareaga10/7/2020 Stove Pipe Top of PVC Casing 22.667.0115.6532S/13E-30F03Highway 1 - DeepCareaga7/6/2020 Stove Pipe Top of PVC Casing 22.669.4813.1832S/13E-30F03Highway 1 - DeepCareaga4/7/2020 Stove Pipe Top of PVC Casing 22.6611.9710.6932S/13E-30F03Highway 1 - DeepCareaga1/7/2020 Stove Pipe Top of PVC Casing 22.6611.0311.6332S/13E-30F03Highway 1 - DeepCareaga10/9/2019 Stove Pipe Top of PVC Casing 22.668.7613.9032S/13E-30F03Highway 1 - DeepCareaga7/9/2019 Stove Pipe Top of PVC Casing 22.669.7812.8832S/13E-30F03Highway 1 - DeepCareaga4/9/2019 Stove Pipe Top of PVC Casing 22.6610.6112.0532S/13E-30F03Highway 1 - DeepCareaga1/8/2019 Stove Pipe Top of PVC Casing 22.668.8913.7732S/13E-30F03Highway 1 - DeepCareaga10/9/2018 Stove Pipe Top of PVC Casing 22.667.6814.9832S/13E-30F03Highway 1 - DeepCareaga7/10/2018 Stove Pipe Top of PVC Casing 22.667.0515.6132S/13E-30F03Highway 1 - DeepCareaga4/10/2018 Stove Pipe Top of PVC Casing 22.6611.0011.6632S/13E-30F03Highway 1 - DeepCareaga1/10/2018 Stove Pipe Top of PVC Casing 22.6610.3112.3532S/13E-30F03Highway 1 - DeepCareaga 10/10/2017 Stove Pipe Top of PVC Casing 22.668.4614.2032S/13E-30F03Highway 1 - DeepCareaga7/11/2017 Stove Pipe Top of PVC Casing 22.669.5213.1432S/13E-30F03Highway 1 - DeepCareaga4/11/2017 Stove Pipe Top of PVC Casing 22.6610.8011.8632S/13E-30F03Highway 1 - DeepCareaga1/10/2017 Stove Pipe Top of PVC Casing 22.668.9113.7532S/13E-30F03Highway 1 - DeepCareaga 10/12/2016 Stove Pipe Top of PVC Casing 22.665.3417.3232S/13E-30F03Highway 1 - DeepCareaga7/19/2016 Stove Pipe Top of PVC Casing 22.665.9416.7232S/13E-30F03Highway 1 - DeepCareaga4/12/2016 Stove Pipe Top of PVC Casing 22.668.2614.4032S/13E-30F03Highway 1 - DeepCareaga1/12/2016 Stove Pipe Top of PVC Casing 22.668.3214.3432S/13E-30F03Highway 1 - DeepCareaga 10/13/2015 Stove Pipe Top of PVC Casing 22.664.2918.3732S/13E-30F03Highway 1 - DeepCareaga7/14/2015 Stove Pipe Top of PVC Casing 22.664.2918.3732S/13E-30F03Highway 1 - DeepCareaga4/14/2015 Stove Pipe Top of PVC Casing 22.665.2417.4232S/13E-30F03Highway 1 - DeepCareaga1/13/2015 Stove Pipe Top of PVC Casing 22.669.0313.6332S/13E-30F03Highway 1 - DeepCareaga 10/14/2014 Stove Pipe Top of PVC Casing 22.664.1818.4832S/13E-30F03Highway 1 - DeepCareaga7/29/2014 Stove Pipe Top of PVC Casing 22.664.5418.1232S/13E-30F03Highway 1 - DeepCareaga6/4/2014 Stove Pipe Top of PVC Casing 22.660.8921.7732S/13E-30F03Highway 1 - DeepCareaga5/5/2014 Stove Pipe Top of PVC Casing 22.661.8220.8432S/13E-30F03Highway 1 - DeepCareaga4/15/2014 Stove Pipe Top of PVC Casing 22.667.0215.6432S/13E-30F03Highway 1 - DeepCareaga1/14/2014 Stove Pipe Top of PVC Casing 22.667.8114.8532S/13E-30F03Highway 1 - DeepCareaga 10/14/2013 Stove Pipe Top of PVC Casing 22.665.8616.8032S/13E-30F03Highway 1 - DeepCareaga7/9/2013 Stove Pipe Top of PVC Casing 22.666.5516.1132S/13E-30F03Highway 1 - DeepCareaga4/10/2013 Stove Pipe Top of PVC Casing 22.668.4714.19P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 242 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)32S/13E-30F03Highway 1 - DeepCareaga1/14/2013 Stove Pipe Top of PVC Casing 22.6610.5412.1232S/13E-30F03Highway 1 - DeepCareaga 10/30/2012 Stove Pipe Top of PVC Casing 22.668.5514.1132S/13E-30F03Highway 1 - DeepCareaga7/24/2012 Stove Pipe Top of PVC Casing 22.668.6614.0032S/13E-30F03Highway 1 - DeepCareaga4/18/2012 Stove Pipe Top of PVC Casing 22.6612.739.9332S/13E-30F03Highway 1 - DeepCareaga1/12/2012 Stove Pipe Top of PVC Casing 22.6610.7911.8732S/13E-30F03Highway 1 - DeepCareaga 11/21/2011 Stove Pipe Top of PVC Casing 22.669.9212.7432S/13E-30F03Highway 1 - DeepCareaga7/26/2011 Stove Pipe Top of PVC Casing 22.668.9413.7232S/13E-30F03Highway 1 - DeepCareaga4/20/2011 Stove Pipe Top of PVC Casing 22.6610.6512.0132S/13E-30F03Highway 1 - DeepCareaga1/24/2011 Stove Pipe Top of PVC Casing 22.6610.4912.1732S/13E-30F03Highway 1 - DeepCareaga 10/21/2010 Stove Pipe Top of PVC Casing 22.6616.546.1232S/13E-30F03Highway 1 - DeepCareaga7/26/2010 Stove Pipe Top of PVC Casing 22.665.8416.8232S/13E-30F03Highway 1 - DeepCareaga4/27/2010 Stove Pipe Top of PVC Casing 22.668.9813.6832S/13E-30F03Highway 1 - DeepCareaga1/28/2010 Stove Pipe Top of PVC Casing 22.669.3813.2832S/13E-30F03Highway 1 - DeepCareaga 10/19/2009 Stove Pipe Top of PVC Casing 22.666.1816.4832S/13E-30F03Highway 1 - DeepCareaga8/19/2009 Stove Pipe Top of PVC Casing 22.660.1322.5332S/13E-30F03Highway 1 - DeepCareaga5/12/2009 Stove Pipe Top of PVC Casing 22.662.6819.9832S/13E-30F03Highway 1 - DeepCareaga 10/15/2008 Stove Pipe Top of PVC Casing 22.66-2.1624.8232S/13E-30F03Highway 1 - DeepCareaga4/15/2008 Stove Pipe Top of PVC Casing 22.662.5020.1632S/13E-30F03Highway 1 - DeepCareaga 10/18/2007 Stove Pipe Top of PVC Casing 22.66-1.9924.6532S/13E-30F03Highway 1 - DeepCareaga4/17/2007 Stove Pipe Top of PVC Casing 22.66-1.3924.0532S/13E-30F03Highway 1 - DeepCareaga 10/19/2006 Stove Pipe Top of PVC Casing 22.666.7115.9532S/13E-30F03Highway 1 - DeepCareaga4/26/2006 Stove Pipe Top of PVC Casing 22.669.9112.7532S/13E-30F03Highway 1 - DeepCareaga10/7/2005 Stove Pipe Top of PVC Casing 22.665.7116.9532S/13E-30F03Highway 1 - DeepCareaga4/28/2005 Stove Pipe Top of PVC Casing 22.666.9615.7032S/13E-30F03Highway 1 - DeepCareaga 10/27/2004 Stove Pipe Top of PVC Casing 22.660.3622.3032S/13E-30F03Highway 1 - DeepCareaga4/8/2004 Stove Pipe Top of PVC Casing 22.666.4616.2032S/13E-30F03Highway 1 - DeepCareaga 10/14/2002 Stove Pipe Top of PVC Casing 22.664.2618.4032S/13E-30F03Highway 1 - DeepCareaga4/9/2002 Stove Pipe Top of PVC Casing 22.666.8615.8032S/13E-30F03Highway 1 - DeepCareaga10/5/2001 Stove Pipe Top of PVC Casing 22.666.9615.7032S/13E-30F03Highway 1 - DeepCareaga4/23/2001 Stove Pipe Top of PVC Casing 22.6612.2610.4032S/13E-30F03Highway 1 - DeepCareaga 10/16/2000 Stove Pipe Top of PVC Casing 22.668.2614.4032S/13E-30F03Highway 1 - DeepCareaga4/24/2000 Stove Pipe Top of PVC Casing 22.664.1618.5032S/13E-30F03Highway 1 - DeepCareaga 10/29/1999 Stove Pipe Top of PVC Casing 22.668.8613.8032S/13E-30F03Highway 1 - DeepCareaga4/15/1999 Stove Pipe Top of PVC Casing 22.6613.279.3932S/13E-30F03Highway 1 - DeepCareaga 10/20/1998 Stove Pipe Top of PVC Casing 22.665.6617.0032S/13E-30F03Highway 1 - DeepCareaga4/22/1998 Stove Pipe Top of PVC Casing 22.6611.6111.0532S/13E-30F03Highway 1 - DeepCareaga 10/22/1997 Stove Pipe Top of PVC Casing 22.662.5020.1632S/13E-30F03Highway 1 - DeepCareaga4/29/1997 Stove Pipe Top of PVC Casing 22.662.5020.1632S/13E-30F03Highway 1 - DeepCareaga 10/23/1996 Stove Pipe Top of PVC Casing 22.661.0221.6432S/13E-30F03Highway 1 - DeepCareaga4/29/1996 Stove Pipe Top of PVC Casing 22.664.1618.5032S/13E-30F03Highway 1 - DeepCareaga 10/11/1995 Stove Pipe Top of PVC Casing 22.66-2.6425.3032S/13E-30F03Highway 1 - DeepCareaga4/19/1995 Stove Pipe Top of PVC Casing 22.668.7613.9032S/13E-30F03Highway 1 - DeepCareaga11/1/1994 Stove Pipe Top of PVC Casing 22.662.7619.9032S/13E-30F03Highway 1 - DeepCareaga4/11/1994 Stove Pipe Top of PVC Casing 22.666.3116.3532S/13E-30F03Highway 1 - DeepCareaga 10/13/1993 Stove Pipe Top of PVC Casing 22.663.0819.58P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 243 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)32S/13E-30F03Highway 1 - DeepCareaga4/8/1993 Stove Pipe Top of PVC Casing 22.6610.1112.5532S/13E-30F03Highway 1 - DeepCareaga11/4/1992 Stove Pipe Top of PVC Casing 22.662.0620.6032S/13E-30F03Highway 1 - DeepCareaga4/21/1992 Stove Pipe Top of PVC Casing 22.665.1617.5032S/13E-30F03Highway 1 - DeepCareaga 10/11/1991 Stove Pipe Top of PVC Casing 22.660.3422.3232S/13E-30F03Highway 1 - DeepCareaga4/19/1991 Stove Pipe Top of PVC Casing 22.663.5419.1232S/13E-30F03Highway 1 - DeepCareaga 10/11/1990 Stove Pipe Top of PVC Casing 22.662.2420.4232S/13E-30F03Highway 1 - DeepCareaga4/24/1990 Stove Pipe Top of PVC Casing 22.665.3317.3332S/13E-30F03Highway 1 - DeepCareaga10/4/1989 Stove Pipe Top of PVC Casing 22.664.4018.2632S/13E-30F03Highway 1 - DeepCareaga4/17/1989 Stove Pipe Top of PVC Casing 22.663.9618.7032S/13E-30F03Highway 1 - DeepCareaga 10/20/1988 Stove Pipe Top of PVC Casing 22.663.3319.3332S/13E-30F03Highway 1 - DeepCareaga4/29/1988 Stove Pipe Top of PVC Casing 22.665.6617.0032S/13E-30F03Highway 1 - DeepCareaga 10/19/1987 Stove Pipe Top of PVC Casing 22.661.5921.0732S/13E-30F03Highway 1 - DeepCareaga4/13/1987 Stove Pipe Top of PVC Casing 22.667.4715.1932S/13E-30F03Highway 1 - DeepCareaga 10/31/1986 Stove Pipe Top of PVC Casing 22.661.3121.3532S/13E-30F03Highway 1 - DeepCareaga4/15/1986 Stove Pipe Top of PVC Casing 22.664.5318.1332S/13E-30F03Highway 1 - DeepCareaga 10/18/1985 Stove Pipe Top of PVC Casing 22.665.1317.5332S/13E-30F03Highway 1 - DeepCareaga4/22/1985 Stove Pipe Top of PVC Casing 22.668.3614.3032S/13E-30F03Highway 1 - DeepCareaga 10/15/1984 Stove Pipe Top of PVC Casing 22.663.4819.1832S/13E-30F03Highway 1 - DeepCareaga 10/27/1983 Stove Pipe Top of PVC Casing 22.6612.889.7832S/13E-30F03Highway 1 - DeepCareaga5/6/1982 Stove Pipe Top of PVC Casing 22.6611.2111.4532S/13E-30F03Highway 1 - DeepCareaga 10/19/1981 Stove Pipe Top of PVC Casing 22.669.2413.4232S/13E-30F03Highway 1 - DeepCareaga4/21/1981 Stove Pipe Top of PVC Casing 22.6613.539.1332S/13E-30F03Highway 1 - DeepCareaga 10/10/1980 Stove Pipe Top of PVC Casing 22.6610.6112.0532S/13E-30F03Highway 1 - DeepCareaga5/9/1980 Stove Pipe Top of PVC Casing 22.6613.349.3232S/13E-30F03Highway 1 - DeepCareaga11/7/1979 Stove Pipe Top of PVC Casing 22.6612.4810.1832S/13E-30F03Highway 1 - DeepCareaga4/17/1979 Stove Pipe Top of PVC Casing 22.6615.277.3932S/13E-30F03Highway 1 - DeepCareaga12/4/1978 Stove Pipe Top of PVC Casing 22.6614.348.3232S/13E-30F03Highway 1 - DeepCareaga4/24/1978 Stove Pipe Top of PVC Casing 22.6615.667.0032S/13E-30F03Highway 1 - DeepCareaga11/7/1977 Stove Pipe Top of PVC Casing 22.669.6113.0532S/13E-30F03Highway 1 - DeepCareaga5/17/1977 Stove Pipe Top of PVC Casing 22.6611.4111.2532S/13E-30F03Highway 1 - DeepCareaga6/9/1976 Stove Pipe Top of PVC Casing 22.666.1216.5432S/13E-30F03Highway 1 - DeepCareaga1/14/1976 Stove Pipe Top of PVC Casing 22.6613.129.5432S/13E-30F03Highway 1 - DeepCareaga7/7/1975 Stove Pipe Top of PVC Casing 22.6611.9410.7232S/13E-30F03Highway 1 - DeepCareaga4/1/1975 Stove Pipe Top of PVC Casing 22.6614.787.8832S/13E-30F03Highway 1 - DeepCareaga6/7/1974 Stove Pipe Top of PVC Casing 22.6614.827.8432S/13E-30F03Highway 1 - DeepCareaga9/20/1973 Stove Pipe Top of PVC Casing 22.6613.189.4832S/13E-30F03Highway 1 - DeepCareaga6/29/1972 Stove Pipe Top of PVC Casing 22.6610.7411.9232S/13E-30F03Highway 1 - DeepCareaga2/23/1972 Stove Pipe Top of PVC Casing 22.6614.717.9532S/13E-30F03Highway 1 - DeepCareaga 11/29/1971 Stove Pipe Top of PVC Casing 22.6613.589.0832S/13E-30F03Highway 1 - DeepCareaga8/26/1971 Stove Pipe Top of PVC Casing 22.6612.1610.5032S/13E-30F03Highway 1 - DeepCareaga6/2/1971 Stove Pipe Top of PVC Casing 22.6613.029.6432S/13E-30F03Highway 1 - DeepCareaga3/2/1971 Stove Pipe Top of PVC Casing 22.6614.608.0632S/13E-30F03Highway 1 - DeepCareaga 12/15/1970 Stove Pipe Top of PVC Casing 22.6614.578.0932S/13E-30F03Highway 1 - DeepCareaga8/4/1970 Stove Pipe Top of PVC Casing 22.6610.2512.4132S/13E-30F03Highway 1 - DeepCareaga6/3/1970 Stove Pipe Top of PVC Casing 22.6610.4812.18P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 244 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)32S/13E-30F03Highway 1 - DeepCareaga3/27/1970 Stove Pipe Top of PVC Casing 22.6613.539.1332S/13E-30F03Highway 1 - DeepCareaga1/29/1970 Stove Pipe Top of PVC Casing 22.6614.018.6532S/13E-30F03Highway 1 - DeepCareaga10/3/1969 Stove Pipe Top of PVC Casing 22.6610.9211.7432S/13E-30F03Highway 1 - DeepCareaga7/23/1969 Stove Pipe Top of PVC Casing 22.6610.3112.3532S/13E-30F03Highway 1 - DeepCareaga6/24/1969 Stove Pipe Top of PVC Casing 22.6611.3211.3432S/13E-30F03Highway 1 - DeepCareaga5/22/1969 Stove Pipe Top of PVC Casing 22.6612.4510.2132S/13E-30F03Highway 1 - DeepCareaga4/18/1969 Stove Pipe Top of PVC Casing 22.6613.838.8332S/13E-30F03Highway 1 - DeepCareaga3/20/1969 Stove Pipe Top of PVC Casing 22.6613.798.8732S/13E-30F03Highway 1 - DeepCareaga2/21/1969 Stove Pipe Top of PVC Casing 22.6613.189.4832S/13E-30F03Highway 1 - DeepCareaga1/15/1969 Stove Pipe Top of PVC Casing 22.6610.9911.6732S/13E-30F03Highway 1 - DeepCareaga 12/12/1968 Stove Pipe Top of PVC Casing 22.6610.0312.6332S/13E-30F03Highway 1 - DeepCareaga 11/14/1968 Stove Pipe Top of PVC Casing 22.668.6114.0532S/13E-30F03Highway 1 - DeepCareaga 10/17/1968 Stove Pipe Top of PVC Casing 22.666.8115.8532S/13E-30F03Highway 1 - DeepCareaga9/14/1968 Stove Pipe Top of PVC Casing 22.666.1616.5032S/13E-30F03Highway 1 - DeepCareaga8/13/1968 Stove Pipe Top of PVC Casing 22.666.7115.9532S/13E-30F03Highway 1 - DeepCareaga6/24/1968 Stove Pipe Top of PVC Casing 22.667.4415.2232S/13E-30F03Highway 1 - DeepCareaga5/30/1968 Stove Pipe Top of PVC Casing 22.668.4514.2132S/13E-30F03Highway 1 - DeepCareaga4/20/1968 Stove Pipe Top of PVC Casing 22.6611.0111.6532S/13E-30F03Highway 1 - DeepCareaga3/21/1968 Stove Pipe Top of PVC Casing 22.6612.1110.5532S/13E-30F03Highway 1 - DeepCareaga2/22/1968 Stove Pipe Top of PVC Casing 22.6612.699.9732S/13E-30F03Highway 1 - DeepCareaga1/17/1968 Stove Pipe Top of PVC Casing 22.6612.759.9132S/13E-30F03Highway 1 - DeepCareaga12/8/1967 Stove Pipe Top of PVC Casing 22.6611.7910.8732S/13E-30F03Highway 1 - DeepCareaga 11/13/1967 Stove Pipe Top of PVC Casing 22.6610.4312.2332S/13E-30F03Highway 1 - DeepCareaga10/9/1967 Stove Pipe Top of PVC Casing 22.6610.2412.4232S/13E-30F03Highway 1 - DeepCareaga9/5/1967 Stove Pipe Top of PVC Casing 22.669.9112.7532S/13E-30F03Highway 1 - DeepCareaga8/8/1967 Stove Pipe Top of PVC Casing 22.6610.2012.4632S/13E-30F03Highway 1 - DeepCareaga7/12/1967 Stove Pipe Top of PVC Casing 22.6610.9611.7032S/13E-30F03Highway 1 - DeepCareaga6/1/1967 Stove Pipe Top of PVC Casing 22.6612.0610.6032S/13E-30F03Highway 1 - DeepCareaga5/2/1967 Stove Pipe Top of PVC Casing 22.6613.239.43P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 245 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)32S/13E-30N01Pier Avenue - ShallowAlluvium 10/10/2023 Stove Pipe Top of PVC Casing 15.767.028.7432S/13E-30N01Pier Avenue - ShallowAlluvium7/4/2023 Stove Pipe Top of PVC Casing 15.767.008.7632S/13E-30N01Pier Avenue - ShallowAlluvium4/11/2023 Stove Pipe Top of PVC Casing 15.767.518.2532S/13E-30N01Pier Avenue - ShallowAlluvium2/7/2023 Stove Pipe Top of PVC Casing 15.767.538.2332S/13E-30N01Pier Avenue - ShallowAlluvium10/3/2022 Stove Pipe Top of PVC Casing 15.765.959.8132S/13E-30N01Pier Avenue - ShallowAlluvium7/11/2022 Stove Pipe Top of PVC Casing 15.766.209.5632S/13E-30N01Pier Avenue - ShallowAlluvium4/5/2022 Stove Pipe Top of PVC Casing 15.766.938.8332S/13E-30N01Pier Avenue - ShallowAlluvium1/4/2022 Stove Pipe Top of PVC Casing 15.767.218.5532S/13E-30N01Pier Avenue - ShallowAlluvium10/5/2021 Stove Pipe Top of PVC Casing 15.766.299.4732S/13E-30N01Pier Avenue - ShallowAlluvium7/13/2021 Stove Pipe Top of PVC Casing 15.766.689.0832S/13E-30N01Pier Avenue - ShallowAlluvium4/6/2021 Stove Pipe Top of PVC Casing 15.766.888.8832S/13E-30N01Pier Avenue - ShallowAlluvium1/6/2021 Stove Pipe Top of PVC Casing 15.767.238.5332S/13E-30N01Pier Avenue - ShallowAlluvium10/7/2020 Stove Pipe Top of PVC Casing 15.766.838.9332S/13E-30N01Pier Avenue - ShallowAlluvium7/6/2020 Stove Pipe Top of PVC Casing 15.766.978.7932S/13E-30N01Pier Avenue - ShallowAlluvium4/7/2020 Stove Pipe Top of PVC Casing 15.767.228.5432S/13E-30N01Pier Avenue - ShallowAlluvium1/7/2020 Stove Pipe Top of PVC Casing 15.767.188.5832S/13E-30N01Pier Avenue - ShallowAlluvium10/9/2019 Stove Pipe Top of PVC Casing 15.766.509.2632S/13E-30N01Pier Avenue - ShallowAlluvium7/9/2019 Stove Pipe Top of PVC Casing 15.766.888.8832S/13E-30N01Pier Avenue - ShallowAlluvium4/9/2019 Stove Pipe Top of PVC Casing 15.767.228.5432S/13E-30N01Pier Avenue - ShallowAlluvium1/8/2019 Stove Pipe Top of PVC Casing 15.767.538.2332S/13E-30N01Pier Avenue - ShallowAlluvium10/9/2018 Stove Pipe Top of PVC Casing 15.766.788.9832S/13E-30N01Pier Avenue - ShallowAlluvium7/10/2018 Stove Pipe Top of PVC Casing 15.766.679.0932S/13E-30N01Pier Avenue - ShallowAlluvium4/10/2018 Stove Pipe Top of PVC Casing 15.767.098.6732S/13E-30N01Pier Avenue - ShallowAlluvium1/10/2018 Stove Pipe Top of PVC Casing 15.767.168.6032S/13E-30N01Pier Avenue - ShallowAlluvium 10/10/2017 Stove Pipe Top of PVC Casing 15.766.788.9832S/13E-30N01Pier Avenue - ShallowAlluvium7/11/2017 Stove Pipe Top of PVC Casing 15.767.138.6332S/13E-30N01Pier Avenue - ShallowAlluvium4/11/2017 Stove Pipe Top of PVC Casing 15.767.438.3332S/13E-30N01Pier Avenue - ShallowAlluvium1/10/2017 Stove Pipe Top of PVC Casing 15.768.247.5232S/13E-30N01Pier Avenue - ShallowAlluvium 10/12/2016 Stove Pipe Top of PVC Casing 15.765.929.8432S/13E-30N01Pier Avenue - ShallowAlluvium7/19/2016 Stove Pipe Top of PVC Casing 15.766.229.5432S/13E-30N01Pier Avenue - ShallowAlluvium4/12/2016 Stove Pipe Top of PVC Casing 15.767.208.5632S/13E-30N01Pier Avenue - ShallowAlluvium1/12/2016 Stove Pipe Top of PVC Casing 15.767.408.3632S/13E-30N01Pier Avenue - ShallowAlluvium 10/13/2015 Stove Pipe Top of PVC Casing 15.766.029.7432S/13E-30N01Pier Avenue - ShallowAlluvium7/14/2015 Stove Pipe Top of PVC Casing 15.766.229.5432S/13E-30N01Pier Avenue - ShallowAlluvium4/14/2015 Stove Pipe Top of PVC Casing 15.766.629.1432S/13E-30N01Pier Avenue - ShallowAlluvium1/13/2015 Stove Pipe Top of PVC Casing 15.767.108.6632S/13E-30N01Pier Avenue - ShallowAlluvium 10/14/2014 Stove Pipe Top of PVC Casing 15.766.189.5832S/13E-30N01Pier Avenue - ShallowAlluvium7/29/2014 Stove Pipe Top of PVC Casing 15.766.259.5132S/13E-30N01Pier Avenue - ShallowAlluvium6/4/2014 Stove Pipe Top of PVC Casing 15.766.599.1732S/13E-30N01Pier Avenue - ShallowAlluvium4/15/2014 Stove Pipe Top of PVC Casing 15.766.968.8032S/13E-30N01Pier Avenue - ShallowAlluvium1/14/2014 Stove Pipe Top of PVC Casing 15.766.529.2432S/13E-30N01Pier Avenue - ShallowAlluvium 10/14/2013 Stove Pipe Top of PVC Casing 15.766.279.4932S/13E-30N01Pier Avenue - ShallowAlluvium7/9/2013 Stove Pipe Top of PVC Casing 15.766.739.0332S/13E-30N01Pier Avenue - ShallowAlluvium4/10/2013 Stove Pipe Top of PVC Casing 15.767.158.6132S/13E-30N01Pier Avenue - ShallowAlluvium1/14/2013 Stove Pipe Top of PVC Casing 15.767.538.23P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 246 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)32S/13E-30N01Pier Avenue - ShallowAlluvium 10/29/2012 Stove Pipe Top of PVC Casing 15.767.178.5932S/13E-30N01Pier Avenue - ShallowAlluvium7/23/2012 Stove Pipe Top of PVC Casing 15.767.598.1732S/13E-30N01Pier Avenue - ShallowAlluvium4/18/2012 Stove Pipe Top of PVC Casing 15.767.608.1632S/13E-30N01Pier Avenue - ShallowAlluvium1/9/2012 Stove Pipe Top of PVC Casing 15.767.398.3732S/13E-30N01Pier Avenue - ShallowAlluvium 11/21/2011 Stove Pipe Top of PVC Casing 15.767.358.4132S/13E-30N01Pier Avenue - ShallowAlluvium7/26/2011 Stove Pipe Top of PVC Casing 15.767.128.6432S/13E-30N01Pier Avenue - ShallowAlluvium4/20/2011 Stove Pipe Top of PVC Casing 15.767.548.2232S/13E-30N01Pier Avenue - ShallowAlluvium1/24/2011 Stove Pipe Top of PVC Casing 15.767.957.8132S/13E-30N01Pier Avenue - ShallowAlluvium 10/21/2010 Stove Pipe Top of PVC Casing 15.766.149.6232S/13E-30N01Pier Avenue - ShallowAlluvium7/27/2010 Stove Pipe Top of PVC Casing 15.767.168.6032S/13E-30N01Pier Avenue - ShallowAlluvium4/27/2010 Stove Pipe Top of PVC Casing 15.767.398.3732S/13E-30N01Pier Avenue - ShallowAlluvium1/26/2010 Stove Pipe Top of PVC Casing 15.768.637.1332S/13E-30N01Pier Avenue - ShallowAlluvium 10/20/2009 Stove Pipe Top of PVC Casing 15.767.008.7632S/13E-30N01Pier Avenue - ShallowAlluvium8/20/2009 Stove Pipe Top of PVC Casing 15.766.828.9432S/13E-30N01Pier Avenue - ShallowAlluvium5/11/2009 Stove Pipe Top of PVC Casing 15.767.508.2632S/13E-30N01Pier Avenue - ShallowAlluvium4/7/2009 Stove Pipe Top of PVC Casing 15.767.708.0632S/13E-30N01Pier Avenue - ShallowAlluvium 10/15/2008 Stove Pipe Top of PVC Casing 15.766.349.4232S/13E-30N01Pier Avenue - ShallowAlluvium4/15/2008 Stove Pipe Top of PVC Casing 15.767.338.4332S/13E-30N01Pier Avenue - ShallowAlluvium 10/18/2007 Stove Pipe Top of PVC Casing 15.766.339.4332S/13E-30N01Pier Avenue - ShallowAlluvium4/25/2006 Stove Pipe Top of PVC Casing 15.767.987.7832S/13E-30N01Pier Avenue - ShallowAlluvium10/7/2005 Stove Pipe Top of PVC Casing 15.766.689.0832S/13E-30N01Pier Avenue - ShallowAlluvium4/29/2005 Stove Pipe Top of PVC Casing 15.768.187.5832S/13E-30N01Pier Avenue - ShallowAlluvium 10/27/2004 Stove Pipe Top of PVC Casing 15.767.038.7332S/13E-30N01Pier Avenue - ShallowAlluvium4/8/2004 Stove Pipe Top of PVC Casing 15.767.738.0332S/13E-30N01Pier Avenue - ShallowAlluvium 10/14/2002 Stove Pipe Top of PVC Casing 15.766.938.8332S/13E-30N01Pier Avenue - ShallowAlluvium4/9/2002 Stove Pipe Top of PVC Casing 15.767.837.9332S/13E-30N01Pier Avenue - ShallowAlluvium10/5/2001 Stove Pipe Top of PVC Casing 15.767.738.0332S/13E-30N01Pier Avenue - ShallowAlluvium4/23/2001 Stove Pipe Top of PVC Casing 15.768.537.2332S/13E-30N01Pier Avenue - ShallowAlluvium 10/16/2000 Stove Pipe Top of PVC Casing 15.767.638.1332S/13E-30N01Pier Avenue - ShallowAlluvium4/24/2000 Stove Pipe Top of PVC Casing 15.768.337.4332S/13E-30N01Pier Avenue - ShallowAlluvium 10/29/1999 Stove Pipe Top of PVC Casing 15.767.438.3332S/13E-30N01Pier Avenue - ShallowAlluvium4/15/1999 Stove Pipe Top of PVC Casing 15.768.037.7332S/13E-30N01Pier Avenue - ShallowAlluvium 10/20/1998 Stove Pipe Top of PVC Casing 15.767.338.4332S/13E-30N01Pier Avenue - ShallowAlluvium4/22/1998 Stove Pipe Top of PVC Casing 15.768.637.1332S/13E-30N01Pier Avenue - ShallowAlluvium 10/22/1997 Stove Pipe Top of PVC Casing 15.767.518.2532S/13E-30N01Pier Avenue - ShallowAlluvium4/29/1997 Stove Pipe Top of PVC Casing 15.767.438.3332S/13E-30N01Pier Avenue - ShallowAlluvium 10/23/1996 Stove Pipe Top of PVC Casing 15.767.388.3832S/13E-30N01Pier Avenue - ShallowAlluvium4/29/1996 Stove Pipe Top of PVC Casing 15.767.738.0332S/13E-30N01Pier Avenue - ShallowAlluvium 10/10/1995 Stove Pipe Top of PVC Casing 15.767.338.4332S/13E-30N01Pier Avenue - ShallowAlluvium4/19/1995 Stove Pipe Top of PVC Casing 15.768.337.4332S/13E-30N01Pier Avenue - ShallowAlluvium11/1/1994 Stove Pipe Top of PVC Casing 15.766.938.8332S/13E-30N01Pier Avenue - ShallowAlluvium4/11/1994 Stove Pipe Top of PVC Casing 15.767.738.0332S/13E-30N01Pier Avenue - ShallowAlluvium 10/13/1993 Stove Pipe Top of PVC Casing 15.767.208.5632S/13E-30N01Pier Avenue - ShallowAlluvium4/8/1993 Stove Pipe Top of PVC Casing 15.768.137.6332S/13E-30N01Pier Avenue - ShallowAlluvium11/4/1992 Stove Pipe Top of PVC Casing 15.767.438.33P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 247 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)32S/13E-30N01Pier Avenue - ShallowAlluvium4/21/1992 Stove Pipe Top of PVC Casing 15.768.367.4032S/13E-30N01Pier Avenue - ShallowAlluvium4/11/1991 Stove Pipe Top of PVC Casing 15.768.377.3932S/13E-30N01Pier Avenue - ShallowAlluvium 10/11/1990 Stove Pipe Top of PVC Casing 15.766.609.1632S/13E-30N01Pier Avenue - ShallowAlluvium4/24/1990 Stove Pipe Top of PVC Casing 15.767.438.3332S/13E-30N01Pier Avenue - ShallowAlluvium10/4/1989 Stove Pipe Top of PVC Casing 15.766.888.8832S/13E-30N01Pier Avenue - ShallowAlluvium4/17/1989 Stove Pipe Top of PVC Casing 15.767.308.4632S/13E-30N01Pier Avenue - ShallowAlluvium 10/20/1988 Stove Pipe Top of PVC Casing 15.766.769.0032S/13E-30N01Pier Avenue - ShallowAlluvium4/28/1988 Stove Pipe Top of PVC Casing 15.767.408.3632S/13E-30N01Pier Avenue - ShallowAlluvium4/21/1988 Stove Pipe Top of PVC Casing 15.767.768.0032S/13E-30N01Pier Avenue - ShallowAlluvium 10/19/1987 Stove Pipe Top of PVC Casing 15.766.928.8432S/13E-30N01Pier Avenue - ShallowAlluvium4/13/1987 Stove Pipe Top of PVC Casing 15.767.548.2232S/13E-30N01Pier Avenue - ShallowAlluvium11/5/1986 Stove Pipe Top of PVC Casing 15.767.278.4932S/13E-30N01Pier Avenue - ShallowAlluvium4/15/1986 Stove Pipe Top of PVC Casing 15.768.647.1232S/13E-30N01Pier Avenue - ShallowAlluvium4/22/1985 Stove Pipe Top of PVC Casing 15.768.137.6332S/13E-30N01Pier Avenue - ShallowAlluvium 10/24/1984 Stove Pipe Top of PVC Casing 15.767.538.2332S/13E-30N01Pier Avenue - ShallowAlluvium 10/28/1983 Stove Pipe Top of PVC Casing 15.767.538.2332S/13E-30N01Pier Avenue - ShallowAlluvium5/6/1982 Stove Pipe Top of PVC Casing 15.769.506.2632S/13E-30N01Pier Avenue - ShallowAlluvium 10/20/1981 Stove Pipe Top of PVC Casing 15.767.358.4132S/13E-30N01Pier Avenue - ShallowAlluvium4/21/1981 Stove Pipe Top of PVC Casing 15.768.187.5832S/13E-30N01Pier Avenue - ShallowAlluvium 10/10/1980 Stove Pipe Top of PVC Casing 15.767.588.1832S/13E-30N01Pier Avenue - ShallowAlluvium5/9/1980 Stove Pipe Top of PVC Casing 15.768.567.2032S/13E-30N01Pier Avenue - ShallowAlluvium11/7/1979 Stove Pipe Top of PVC Casing 15.767.648.1232S/13E-30N01Pier Avenue - ShallowAlluvium4/17/1979 Stove Pipe Top of PVC Casing 15.767.907.8632S/13E-30N01Pier Avenue - ShallowAlluvium12/4/1978 Stove Pipe Top of PVC Casing 15.767.897.8732S/13E-30N01Pier Avenue - ShallowAlluvium4/24/1978 Stove Pipe Top of PVC Casing 15.768.287.4832S/13E-30N01Pier Avenue - ShallowAlluvium11/7/1977 Stove Pipe Top of PVC Casing 15.767.378.3932S/13E-30N01Pier Avenue - ShallowAlluvium5/17/1977 Stove Pipe Top of PVC Casing 15.767.128.6432S/13E-30N01Pier Avenue - ShallowAlluvium6/7/1976 Stove Pipe Top of PVC Casing 15.767.018.7532S/13E-30N01Pier Avenue - ShallowAlluvium5/21/1976 Stove Pipe Top of PVC Casing 15.767.038.7332S/13E-30N01Pier Avenue - ShallowAlluvium1/14/1976 Stove Pipe Top of PVC Casing 15.767.388.3832S/13E-30N01Pier Avenue - ShallowAlluvium7/7/1975 Stove Pipe Top of PVC Casing 15.767.208.5632S/13E-30N01Pier Avenue - ShallowAlluvium4/1/1975 Stove Pipe Top of PVC Casing 15.767.358.4132S/13E-30N01Pier Avenue - ShallowAlluvium6/7/1974 Stove Pipe Top of PVC Casing 15.767.418.3532S/13E-30N01Pier Avenue - ShallowAlluvium9/20/1973 Stove Pipe Top of PVC Casing 15.766.788.9832S/13E-30N01Pier Avenue - ShallowAlluvium6/29/1972 Stove Pipe Top of PVC Casing 15.767.058.7132S/13E-30N01Pier Avenue - ShallowAlluvium2/29/1972 Stove Pipe Top of PVC Casing 15.766.739.0332S/13E-30N01Pier Avenue - ShallowAlluvium 11/29/1971 Stove Pipe Top of PVC Casing 15.767.228.5432S/13E-30N01Pier Avenue - ShallowAlluvium8/26/1971 Stove Pipe Top of PVC Casing 15.767.308.4632S/13E-30N01Pier Avenue - ShallowAlluvium6/2/1971 Stove Pipe Top of PVC Casing 15.767.418.3532S/13E-30N01Pier Avenue - ShallowAlluvium3/2/1971 Stove Pipe Top of PVC Casing 15.768.047.7232S/13E-30N01Pier Avenue - ShallowAlluvium 12/15/1970 Stove Pipe Top of PVC Casing 15.767.807.9632S/13E-30N01Pier Avenue - ShallowAlluvium5/22/1969 Stove Pipe Top of PVC Casing 15.767.258.5132S/13E-30N01Pier Avenue - ShallowAlluvium4/18/1969 Stove Pipe Top of PVC Casing 15.767.598.1732S/13E-30N01Pier Avenue - ShallowAlluvium3/20/1969 Stove Pipe Top of PVC Casing 15.768.117.6532S/13E-30N01Pier Avenue - ShallowAlluvium2/21/1969 Stove Pipe Top of PVC Casing 15.768.577.19P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 248 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)32S/13E-30N01Pier Avenue - ShallowAlluvium1/5/1969 Stove Pipe Top of PVC Casing 15.766.878.8932S/13E-30N01Pier Avenue - ShallowAlluvium 12/12/1968 Stove Pipe Top of PVC Casing 15.766.299.4732S/13E-30N01Pier Avenue - ShallowAlluvium 11/14/1968 Stove Pipe Top of PVC Casing 15.766.079.6932S/13E-30N01Pier Avenue - ShallowAlluvium 10/17/1968 Stove Pipe Top of PVC Casing 15.765.7210.0432S/13E-30N01Pier Avenue - ShallowAlluvium9/14/1968 Stove Pipe Top of PVC Casing 15.765.6510.1132S/13E-30N01Pier Avenue - ShallowAlluvium8/13/1968 Stove Pipe Top of PVC Casing 15.766.039.7332S/13E-30N01Pier Avenue - ShallowAlluvium3/21/1968 Stove Pipe Top of PVC Casing 15.767.388.3832S/13E-30N01Pier Avenue - ShallowAlluvium2/22/1968 Stove Pipe Top of PVC Casing 15.767.308.4632S/13E-30N01Pier Avenue - ShallowAlluvium1/17/1968 Stove Pipe Top of PVC Casing 15.766.858.9132S/13E-30N01Pier Avenue - ShallowAlluvium12/8/1967 Stove Pipe Top of PVC Casing 15.767.088.6832S/13E-30N01Pier Avenue - ShallowAlluvium 11/13/1967 Stove Pipe Top of PVC Casing 15.766.519.2532S/13E-30N01Pier Avenue - ShallowAlluvium10/9/1967 Stove Pipe Top of PVC Casing 15.766.239.5332S/13E-30N01Pier Avenue - ShallowAlluvium9/5/1967 Stove Pipe Top of PVC Casing 15.766.359.4132S/13E-30N01Pier Avenue - ShallowAlluvium8/8/1967 Stove Pipe Top of PVC Casing 15.766.499.2732S/13E-30N01Pier Avenue - ShallowAlluvium7/12/1967 Stove Pipe Top of PVC Casing 15.766.519.2532S/13E-30N01Pier Avenue - ShallowAlluvium6/1/1967 Stove Pipe Top of PVC Casing 15.766.788.9832S/13E-30N01Pier Avenue - ShallowAlluvium5/2/1967 Stove Pipe Top of PVC Casing 15.767.138.63P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 249 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)32S/13E-30N03Pier Avenue - MiddlePaso Robles 10/10/2023 Stove Pipe Top of PVC Casing 15.679.406.2732S/13E-30N03Pier Avenue - MiddlePaso Robles 7/4/2023 Stove Pipe Top of PVC Casing 15.678.776.9032S/13E-30N03Pier Avenue - MiddlePaso Robles 4/11/2023 Stove Pipe Top of PVC Casing 15.678.966.7132S/13E-30N03Pier Avenue - MiddlePaso Robles 2/7/2023 Stove Pipe Top of PVC Casing 15.679.146.5332S/13E-30N03Pier Avenue - MiddlePaso Robles 10/3/2022 Stove Pipe Top of PVC Casing 15.676.229.4532S/13E-30N03Pier Avenue - MiddlePaso Robles 7/11/2022 Stove Pipe Top of PVC Casing 15.675.779.9032S/13E-30N03Pier Avenue - MiddlePaso Robles 4/5/2022 Stove Pipe Top of PVC Casing 15.676.189.4932S/13E-30N03Pier Avenue - MiddlePaso Robles 1/4/2022 Stove Pipe Top of PVC Casing 15.678.297.3832S/13E-30N03Pier Avenue - MiddlePaso Robles 10/5/2021 Stove Pipe Top of PVC Casing 15.676.788.8932S/13E-30N03Pier Avenue - MiddlePaso Robles 7/13/2021 Stove Pipe Top of PVC Casing 15.675.6410.0332S/13E-30N03Pier Avenue - MiddlePaso Robles 4/6/2021 Stove Pipe Top of PVC Casing 15.678.367.3132S/13E-30N03Pier Avenue - MiddlePaso Robles 1/6/2021 Stove Pipe Top of PVC Casing 15.677.328.3532S/13E-30N03Pier Avenue - MiddlePaso Robles 10/7/2020 Stove Pipe Top of PVC Casing 15.677.138.5432S/13E-30N03Pier Avenue - MiddlePaso Robles 7/6/2020 Stove Pipe Top of PVC Casing 15.677.767.9132S/13E-30N03Pier Avenue - MiddlePaso Robles 4/7/2020 Stove Pipe Top of PVC Casing 15.678.716.9632S/13E-30N03Pier Avenue - MiddlePaso Robles 1/7/2020 Stove Pipe Top of PVC Casing 15.678.247.4332S/13E-30N03Pier Avenue - MiddlePaso Robles 10/9/2019 Stove Pipe Top of PVC Casing 15.677.847.8332S/13E-30N03Pier Avenue - MiddlePaso Robles 7/9/2019 Stove Pipe Top of PVC Casing 15.677.787.8932S/13E-30N03Pier Avenue - MiddlePaso Robles 4/9/2019 Stove Pipe Top of PVC Casing 15.677.887.7932S/13E-30N03Pier Avenue - MiddlePaso Robles 1/8/2019 Stove Pipe Top of PVC Casing 15.678.237.4432S/13E-30N03Pier Avenue - MiddlePaso Robles 10/9/2018 Stove Pipe Top of PVC Casing 15.677.767.9132S/13E-30N03Pier Avenue - MiddlePaso Robles 7/10/2018 Stove Pipe Top of PVC Casing 15.677.018.6632S/13E-30N03Pier Avenue - MiddlePaso Robles 4/10/2018 Stove Pipe Top of PVC Casing 15.678.637.0432S/13E-30N03Pier Avenue - MiddlePaso Robles 1/10/2018 Stove Pipe Top of PVC Casing 15.678.527.1532S/13E-30N03Pier Avenue - MiddlePaso Robles 10/10/2017 Stove Pipe Top of PVC Casing 15.677.528.1532S/13E-30N03Pier Avenue - MiddlePaso Robles 7/11/2017 Stove Pipe Top of PVC Casing 15.677.298.3832S/13E-30N03Pier Avenue - MiddlePaso Robles 4/11/2017 Stove Pipe Top of PVC Casing 15.678.587.0932S/13E-30N03Pier Avenue - MiddlePaso Robles 1/10/2017 Stove Pipe Top of PVC Casing 15.679.026.6532S/13E-30N03Pier Avenue - MiddlePaso Robles 10/12/2016 Stove Pipe Top of PVC Casing 15.676.009.6732S/13E-30N03Pier Avenue - MiddlePaso Robles 7/19/2016 Stove Pipe Top of PVC Casing 15.675.5110.1632S/13E-30N03Pier Avenue - MiddlePaso Robles 4/12/2016 Stove Pipe Top of PVC Casing 15.676.928.7532S/13E-30N03Pier Avenue - MiddlePaso Robles 1/12/2016 Stove Pipe Top of PVC Casing 15.678.157.5232S/13E-30N03Pier Avenue - MiddlePaso Robles 10/13/2015 Stove Pipe Top of PVC Casing 15.675.6510.0232S/13E-30N03Pier Avenue - MiddlePaso Robles 7/14/2015 Stove Pipe Top of PVC Casing 15.675.2510.4232S/13E-30N03Pier Avenue - MiddlePaso Robles 4/14/2015 Stove Pipe Top of PVC Casing 15.674.2511.4232S/13E-30N03Pier Avenue - MiddlePaso Robles 1/13/2015 Stove Pipe Top of PVC Casing 15.676.738.9432S/13E-30N03Pier Avenue - MiddlePaso Robles 10/14/2014 Stove Pipe Top of PVC Casing 15.675.6110.0632S/13E-30N03Pier Avenue - MiddlePaso Robles 7/29/2014 Stove Pipe Top of PVC Casing 15.675.919.7632S/13E-30N03Pier Avenue - MiddlePaso Robles 6/4/2014 Stove Pipe Top of PVC Casing 15.674.8010.8732S/13E-30N03Pier Avenue - MiddlePaso Robles 4/15/2014 Stove Pipe Top of PVC Casing 15.676.828.8532S/13E-30N03Pier Avenue - MiddlePaso Robles 1/14/2014 Stove Pipe Top of PVC Casing 15.675.879.8032S/13E-30N03Pier Avenue - MiddlePaso Robles 10/14/2013 Stove Pipe Top of PVC Casing 15.675.4110.2632S/13E-30N03Pier Avenue - MiddlePaso Robles 7/9/2013 Stove Pipe Top of PVC Casing 15.675.779.9032S/13E-30N03Pier Avenue - MiddlePaso Robles 4/10/2013 Stove Pipe Top of PVC Casing 15.677.877.8032S/13E-30N03Pier Avenue - MiddlePaso Robles 1/14/2013 Stove Pipe Top of PVC Casing 15.678.427.25P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 250 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)32S/13E-30N03Pier Avenue - MiddlePaso Robles 10/29/2012 Stove Pipe Top of PVC Casing 15.678.127.5532S/13E-30N03Pier Avenue - MiddlePaso Robles 7/23/2012 Stove Pipe Top of PVC Casing 15.676.988.6932S/13E-30N03Pier Avenue - MiddlePaso Robles 4/18/2012 Stove Pipe Top of PVC Casing 15.679.416.2632S/13E-30N03Pier Avenue - MiddlePaso Robles 1/11/2012 Stove Pipe Top of PVC Casing 15.678.966.7132S/13E-30N03Pier Avenue - MiddlePaso Robles 11/21/2011 Stove Pipe Top of PVC Casing 15.679.685.9932S/13E-30N03Pier Avenue - MiddlePaso Robles 7/26/2011 Stove Pipe Top of PVC Casing 15.678.547.1332S/13E-30N03Pier Avenue - MiddlePaso Robles 4/20/2011 Stove Pipe Top of PVC Casing 15.679.486.1932S/13E-30N03Pier Avenue - MiddlePaso Robles 1/24/2011 Stove Pipe Top of PVC Casing 15.679.456.2232S/13E-30N03Pier Avenue - MiddlePaso Robles 10/21/2010 Stove Pipe Top of PVC Casing 15.675.3710.3032S/13E-30N03Pier Avenue - MiddlePaso Robles 7/27/2010 Stove Pipe Top of PVC Casing 15.676.609.0732S/13E-30N03Pier Avenue - MiddlePaso Robles 4/27/2010 Stove Pipe Top of PVC Casing 15.678.277.4032S/13E-30N03Pier Avenue - MiddlePaso Robles 1/26/2010 Stove Pipe Top of PVC Casing 15.677.658.0232S/13E-30N03Pier Avenue - MiddlePaso Robles 10/20/2009 Stove Pipe Top of PVC Casing 15.676.978.7032S/13E-30N03Pier Avenue - MiddlePaso Robles 8/20/2009 Stove Pipe Top of PVC Casing 15.676.039.6432S/13E-30N03Pier Avenue - MiddlePaso Robles 5/12/2009 Stove Pipe Top of PVC Casing 15.677.208.4732S/13E-30N03Pier Avenue - MiddlePaso Robles 4/15/2008 Stove Pipe Top of PVC Casing 15.678.037.6432S/13E-30N03Pier Avenue - MiddlePaso Robles 10/18/2007 Stove Pipe Top of PVC Casing 15.675.3810.2932S/13E-30N03Pier Avenue - MiddlePaso Robles 4/17/2007 Stove Pipe Top of PVC Casing 15.678.037.6432S/13E-30N03Pier Avenue - MiddlePaso Robles 10/19/2006 Stove Pipe Top of PVC Casing 15.678.067.6132S/13E-30N03Pier Avenue - MiddlePaso Robles 4/25/2006 Stove Pipe Top of PVC Casing 15.6710.285.3932S/13E-30N03Pier Avenue - MiddlePaso Robles 10/7/2005 Stove Pipe Top of PVC Casing 15.677.388.2932S/13E-30N03Pier Avenue - MiddlePaso Robles 4/29/2005 Stove Pipe Top of PVC Casing 15.678.117.5632S/13E-30N03Pier Avenue - MiddlePaso Robles 10/27/2004 Stove Pipe Top of PVC Casing 15.676.838.8432S/13E-30N03Pier Avenue - MiddlePaso Robles 4/8/2004 Stove Pipe Top of PVC Casing 15.678.637.0432S/13E-30N03Pier Avenue - MiddlePaso Robles 10/8/2003 Stove Pipe Top of PVC Casing 15.6710.335.3432S/13E-30N03Pier Avenue - MiddlePaso Robles 10/14/2002 Stove Pipe Top of PVC Casing 15.676.439.2432S/13E-30N03Pier Avenue - MiddlePaso Robles 4/9/2002 Stove Pipe Top of PVC Casing 15.678.936.7432S/13E-30N03Pier Avenue - MiddlePaso Robles 10/5/2001 Stove Pipe Top of PVC Casing 15.678.537.1432S/13E-30N03Pier Avenue - MiddlePaso Robles 4/23/2001 Stove Pipe Top of PVC Casing 15.6710.335.3432S/13E-30N03Pier Avenue - MiddlePaso Robles 10/16/2000 Stove Pipe Top of PVC Casing 15.678.736.9432S/13E-30N03Pier Avenue - MiddlePaso Robles 4/24/2000 Stove Pipe Top of PVC Casing 15.679.436.2432S/13E-30N03Pier Avenue - MiddlePaso Robles 10/28/1999 Stove Pipe Top of PVC Casing 15.677.737.9432S/13E-30N03Pier Avenue - MiddlePaso Robles 4/15/1999 Stove Pipe Top of PVC Casing 15.6710.185.4932S/13E-30N03Pier Avenue - MiddlePaso Robles 10/20/1998 Stove Pipe Top of PVC Casing 15.6710.035.6432S/13E-30N03Pier Avenue - MiddlePaso Robles 4/22/1998 Stove Pipe Top of PVC Casing 15.6712.333.3432S/13E-30N03Pier Avenue - MiddlePaso Robles 10/22/1997 Stove Pipe Top of PVC Casing 15.678.607.0732S/13E-30N03Pier Avenue - MiddlePaso Robles 4/29/1997 Stove Pipe Top of PVC Casing 15.678.936.7432S/13E-30N03Pier Avenue - MiddlePaso Robles 10/23/1996 Stove Pipe Top of PVC Casing 15.678.487.1932S/13E-30N03Pier Avenue - MiddlePaso Robles 4/29/1996 Stove Pipe Top of PVC Casing 15.679.835.8432S/13E-30N03Pier Avenue - MiddlePaso Robles 10/10/1995 Stove Pipe Top of PVC Casing 15.678.836.8432S/13E-30N03Pier Avenue - MiddlePaso Robles 4/19/1995 Stove Pipe Top of PVC Casing 15.6710.435.2432S/13E-30N03Pier Avenue - MiddlePaso Robles 11/1/1994 Stove Pipe Top of PVC Casing 15.676.339.3432S/13E-30N03Pier Avenue - MiddlePaso Robles 4/11/1994 Stove Pipe Top of PVC Casing 15.678.657.0232S/13E-30N03Pier Avenue - MiddlePaso Robles 10/13/1993 Stove Pipe Top of PVC Casing 15.677.558.1232S/13E-30N03Pier Avenue - MiddlePaso Robles 4/8/1993 Stove Pipe Top of PVC Casing 15.6710.185.49P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 251 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)32S/13E-30N03Pier Avenue - MiddlePaso Robles 11/4/1992 Stove Pipe Top of PVC Casing 15.677.138.5432S/13E-30N03Pier Avenue - MiddlePaso Robles 4/21/1992 Stove Pipe Top of PVC Casing 15.679.026.6532S/13E-30N03Pier Avenue - MiddlePaso Robles 10/11/1991 Stove Pipe Top of PVC Casing 15.676.948.7332S/13E-30N03Pier Avenue - MiddlePaso Robles 4/11/1991 Stove Pipe Top of PVC Casing 15.676.399.2832S/13E-30N03Pier Avenue - MiddlePaso Robles 10/11/1990 Stove Pipe Top of PVC Casing 15.675.929.7532S/13E-30N03Pier Avenue - MiddlePaso Robles 4/24/1990 Stove Pipe Top of PVC Casing 15.677.648.0332S/13E-30N03Pier Avenue - MiddlePaso Robles 10/4/1989 Stove Pipe Top of PVC Casing 15.676.998.6832S/13E-30N03Pier Avenue - MiddlePaso Robles 4/17/1989 Stove Pipe Top of PVC Casing 15.676.888.7932S/13E-30N03Pier Avenue - MiddlePaso Robles 10/20/1988 Stove Pipe Top of PVC Casing 15.676.249.4332S/13E-30N03Pier Avenue - MiddlePaso Robles 4/28/1988 Stove Pipe Top of PVC Casing 15.677.088.5932S/13E-30N03Pier Avenue - MiddlePaso Robles 4/21/1988 Stove Pipe Top of PVC Casing 15.677.088.5932S/13E-30N03Pier Avenue - MiddlePaso Robles 10/19/1987 Stove Pipe Top of PVC Casing 15.676.419.2632S/13E-30N03Pier Avenue - MiddlePaso Robles 4/13/1987 Stove Pipe Top of PVC Casing 15.678.447.2332S/13E-30N03Pier Avenue - MiddlePaso Robles 11/5/1986 Stove Pipe Top of PVC Casing 15.678.477.2032S/13E-30N03Pier Avenue - MiddlePaso Robles 4/15/1986 Stove Pipe Top of PVC Casing 15.677.927.7532S/13E-30N03Pier Avenue - MiddlePaso Robles 4/22/1985 Stove Pipe Top of PVC Casing 15.678.736.9432S/13E-30N03Pier Avenue - MiddlePaso Robles 10/24/1984 Stove Pipe Top of PVC Casing 15.677.837.8432S/13E-30N03Pier Avenue - MiddlePaso Robles 10/28/1982 Stove Pipe Top of PVC Casing 15.6710.495.1832S/13E-30N03Pier Avenue - MiddlePaso Robles 5/6/1982 Stove Pipe Top of PVC Casing 15.678.007.6732S/13E-30N03Pier Avenue - MiddlePaso Robles 10/20/1981 Stove Pipe Top of PVC Casing 15.678.307.3732S/13E-30N03Pier Avenue - MiddlePaso Robles 4/21/1981 Stove Pipe Top of PVC Casing 15.6710.445.2332S/13E-30N03Pier Avenue - MiddlePaso Robles 10/10/1980 Stove Pipe Top of PVC Casing 15.678.836.8432S/13E-30N03Pier Avenue - MiddlePaso Robles 5/9/1980 Stove Pipe Top of PVC Casing 15.678.237.4432S/13E-30N03Pier Avenue - MiddlePaso Robles 11/7/1979 Stove Pipe Top of PVC Casing 15.679.685.9932S/13E-30N03Pier Avenue - MiddlePaso Robles 4/17/1979 Stove Pipe Top of PVC Casing 15.679.056.6232S/13E-30N03Pier Avenue - MiddlePaso Robles 12/4/1978 Stove Pipe Top of PVC Casing 15.6710.285.3932S/13E-30N03Pier Avenue - MiddlePaso Robles 4/24/1978 Stove Pipe Top of PVC Casing 15.6710.215.4632S/13E-30N03Pier Avenue - MiddlePaso Robles 11/7/1977 Stove Pipe Top of PVC Casing 15.676.868.8132S/13E-30N03Pier Avenue - MiddlePaso Robles 5/17/1977 Stove Pipe Top of PVC Casing 15.676.868.8132S/13E-30N03Pier Avenue - MiddlePaso Robles 6/7/1976 Stove Pipe Top of PVC Casing 15.677.258.4232S/13E-30N03Pier Avenue - MiddlePaso Robles 5/21/1976 Stove Pipe Top of PVC Casing 15.677.468.2132S/13E-30N03Pier Avenue - MiddlePaso Robles 1/14/1976 Stove Pipe Top of PVC Casing 15.678.537.1432S/13E-30N03Pier Avenue - MiddlePaso Robles 7/7/1975 Stove Pipe Top of PVC Casing 15.678.537.1432S/13E-30N03Pier Avenue - MiddlePaso Robles 4/1/1975 Stove Pipe Top of PVC Casing 15.679.536.1432S/13E-30N03Pier Avenue - MiddlePaso Robles 6/7/1974 Stove Pipe Top of PVC Casing 15.679.536.1432S/13E-30N03Pier Avenue - MiddlePaso Robles 9/20/1973 Stove Pipe Top of PVC Casing 15.678.537.1432S/13E-30N03Pier Avenue - MiddlePaso Robles 6/29/1972 Stove Pipe Top of PVC Casing 15.672.5313.1432S/13E-30N03Pier Avenue - MiddlePaso Robles 2/29/1972 Stove Pipe Top of PVC Casing 15.6710.535.1432S/13E-30N03Pier Avenue - MiddlePaso Robles 11/29/1971 Stove Pipe Top of PVC Casing 15.677.727.9532S/13E-30N03Pier Avenue - MiddlePaso Robles 8/26/1971 Stove Pipe Top of PVC Casing 15.677.538.1432S/13E-30N03Pier Avenue - MiddlePaso Robles 6/2/1971 Stove Pipe Top of PVC Casing 15.677.538.1432S/13E-30N03Pier Avenue - MiddlePaso Robles 3/2/1971 Stove Pipe Top of PVC Casing 15.678.916.7632S/13E-30N03Pier Avenue - MiddlePaso Robles 12/15/1970 Stove Pipe Top of PVC Casing 15.677.508.1732S/13E-30N03Pier Avenue - MiddlePaso Robles 5/22/1969 Stove Pipe Top of PVC Casing 15.676.539.1432S/13E-30N03Pier Avenue - MiddlePaso Robles 4/18/1969 Stove Pipe Top of PVC Casing 15.677.308.37P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 252 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)32S/13E-30N03Pier Avenue - MiddlePaso Robles 3/20/1969 Stove Pipe Top of PVC Casing 15.678.297.3832S/13E-30N03Pier Avenue - MiddlePaso Robles 1/15/1969 Stove Pipe Top of PVC Casing 15.675.2910.3832S/13E-30N03Pier Avenue - MiddlePaso Robles 12/12/1968 Stove Pipe Top of PVC Casing 15.675.719.9632S/13E-30N03Pier Avenue - MiddlePaso Robles 11/14/1968 Stove Pipe Top of PVC Casing 15.674.4811.1932S/13E-30N03Pier Avenue - MiddlePaso Robles 10/17/1968 Stove Pipe Top of PVC Casing 15.673.4612.2132S/13E-30N03Pier Avenue - MiddlePaso Robles 9/14/1968 Stove Pipe Top of PVC Casing 15.672.7612.9132S/13E-30N03Pier Avenue - MiddlePaso Robles 8/23/1968 Stove Pipe Top of PVC Casing 15.671.9413.7332S/13E-30N03Pier Avenue - MiddlePaso Robles 3/21/1968 Stove Pipe Top of PVC Casing 15.674.8910.7832S/13E-30N03Pier Avenue - MiddlePaso Robles 2/22/1968 Stove Pipe Top of PVC Casing 15.676.339.3432S/13E-30N03Pier Avenue - MiddlePaso Robles 1/17/1968 Stove Pipe Top of PVC Casing 15.675.869.8132S/13E-30N03Pier Avenue - MiddlePaso Robles 12/8/1967 Stove Pipe Top of PVC Casing 15.676.589.0932S/13E-30N03Pier Avenue - MiddlePaso Robles 11/13/1967 Stove Pipe Top of PVC Casing 15.674.5011.1732S/13E-30N03Pier Avenue - MiddlePaso Robles 10/9/1967 Stove Pipe Top of PVC Casing 15.675.4810.1932S/13E-30N03Pier Avenue - MiddlePaso Robles 9/5/1967 Stove Pipe Top of PVC Casing 15.675.4610.2132S/13E-30N03Pier Avenue - MiddlePaso Robles 8/8/1967 Stove Pipe Top of PVC Casing 15.674.3911.2832S/13E-30N03Pier Avenue - MiddlePaso Robles 7/12/1967 Stove Pipe Top of PVC Casing 15.674.6111.0632S/13E-30N03Pier Avenue - MiddlePaso Robles 6/1/1967 Stove Pipe Top of PVC Casing 15.676.838.8432S/13E-30N03Pier Avenue - MiddlePaso Robles 5/2/1967 Stove Pipe Top of PVC Casing 15.677.388.29P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 253 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)32S/13E-30N02Pier Avenue - DeepPaso Robles 10/10/2023 Stove Pipe Top of PVC Casing 15.679.136.5432S/13E-30N02Pier Avenue - DeepPaso Robles 7/4/2023 Stove Pipe Top of PVC Casing 15.6710.435.2432S/13E-30N02Pier Avenue - DeepPaso Robles 4/11/2023 Stove Pipe Top of PVC Casing 15.6712.692.9832S/13E-30N02Pier Avenue - DeepPaso Robles 2/7/2023 Stove Pipe Top of PVC Casing 15.6710.415.2632S/13E-30N02Pier Avenue - DeepPaso Robles 10/3/2022 Stove Pipe Top of PVC Casing 15.672.9412.7332S/13E-30N02Pier Avenue - DeepPaso Robles 7/11/2022 Stove Pipe Top of PVC Casing 15.672.4913.1832S/13E-30N02Pier Avenue - DeepPaso Robles 4/5/2022 Stove Pipe Top of PVC Casing 15.676.659.0232S/13E-30N02Pier Avenue - DeepPaso Robles 1/4/2022 Stove Pipe Top of PVC Casing 15.678.307.3732S/13E-30N02Pier Avenue - DeepPaso Robles 10/5/2021 Stove Pipe Top of PVC Casing 15.673.8511.8232S/13E-30N02Pier Avenue - DeepPaso Robles 7/13/2021 Stove Pipe Top of PVC Casing 15.674.4611.2132S/13E-30N02Pier Avenue - DeepPaso Robles 4/6/2021 Stove Pipe Top of PVC Casing 15.677.857.8232S/13E-30N02Pier Avenue - DeepPaso Robles 1/6/2021 Stove Pipe Top of PVC Casing 15.677.598.0832S/13E-30N02Pier Avenue - DeepPaso Robles 10/7/2020 Stove Pipe Top of PVC Casing 15.674.8010.8732S/13E-30N02Pier Avenue - DeepPaso Robles 7/6/2020 Stove Pipe Top of PVC Casing 15.676.958.7232S/13E-30N02Pier Avenue - DeepPaso Robles 4/7/2020 Stove Pipe Top of PVC Casing 15.6711.124.5532S/13E-30N02Pier Avenue - DeepPaso Robles 1/7/2020 Stove Pipe Top of PVC Casing 15.6710.215.4632S/13E-30N02Pier Avenue - DeepPaso Robles 10/9/2019 Stove Pipe Top of PVC Casing 15.676.139.5432S/13E-30N02Pier Avenue - DeepPaso Robles 7/9/2019 Stove Pipe Top of PVC Casing 15.678.087.5932S/13E-30N02Pier Avenue - DeepPaso Robles 4/9/2019 Stove Pipe Top of PVC Casing 15.6710.904.7732S/13E-30N02Pier Avenue - DeepPaso Robles 1/8/2019 Stove Pipe Top of PVC Casing 15.678.537.1432S/13E-30N02Pier Avenue - DeepPaso Robles 10/9/2018 Stove Pipe Top of PVC Casing 15.675.3610.3132S/13E-30N02Pier Avenue - DeepPaso Robles 7/10/2018 Stove Pipe Top of PVC Casing 15.675.909.7732S/13E-30N02Pier Avenue - DeepPaso Robles 4/10/2018 Stove Pipe Top of PVC Casing 15.6710.175.5032S/13E-30N02Pier Avenue - DeepPaso Robles 1/10/2018 Stove Pipe Top of PVC Casing 15.678.706.9732S/13E-30N02Pier Avenue - DeepPaso Robles 10/10/2017 Stove Pipe Top of PVC Casing 15.675.739.9432S/13E-30N02Pier Avenue - DeepPaso Robles 7/11/2017 Stove Pipe Top of PVC Casing 15.677.757.9232S/13E-30N02Pier Avenue - DeepPaso Robles 4/11/2017 Stove Pipe Top of PVC Casing 15.6710.784.8932S/13E-30N02Pier Avenue - DeepPaso Robles 1/10/2017 Stove Pipe Top of PVC Casing 15.678.796.8832S/13E-30N02Pier Avenue - DeepPaso Robles 10/12/2016 Stove Pipe Top of PVC Casing 15.672.6912.9832S/13E-30N02Pier Avenue - DeepPaso Robles 7/19/2016 Stove Pipe Top of PVC Casing 15.673.7311.9432S/13E-30N02Pier Avenue - DeepPaso Robles 4/12/2016 Stove Pipe Top of PVC Casing 15.677.568.1132S/13E-30N02Pier Avenue - DeepPaso Robles 1/12/2016 Stove Pipe Top of PVC Casing 15.678.657.0232S/13E-30N02Pier Avenue - DeepPaso Robles 10/13/2015 Stove Pipe Top of PVC Casing 15.671.9913.6832S/13E-30N02Pier Avenue - DeepPaso Robles 7/14/2015 Stove Pipe Top of PVC Casing 15.672.5813.0932S/13E-30N02Pier Avenue - DeepPaso Robles 4/14/2015 Stove Pipe Top of PVC Casing 15.676.119.5632S/13E-30N02Pier Avenue - DeepPaso Robles 1/13/2015 Stove Pipe Top of PVC Casing 15.678.287.3932S/13E-30N02Pier Avenue - DeepPaso Robles 10/14/2014 Stove Pipe Top of PVC Casing 15.672.4413.2332S/13E-30N02Pier Avenue - DeepPaso Robles 7/29/2014 Stove Pipe Top of PVC Casing 15.672.8612.8132S/13E-30N02Pier Avenue - DeepPaso Robles 6/4/2014 Stove Pipe Top of PVC Casing 15.670.9314.7432S/13E-30N02Pier Avenue - DeepPaso Robles 5/5/2014 Stove Pipe Top of PVC Casing 15.672.9412.7332S/13E-30N02Pier Avenue - DeepPaso Robles 4/15/2014 Stove Pipe Top of PVC Casing 15.677.568.1132S/13E-30N02Pier Avenue - DeepPaso Robles 1/14/2014 Stove Pipe Top of PVC Casing 15.676.838.8432S/13E-30N02Pier Avenue - DeepPaso Robles 10/14/2013 Stove Pipe Top of PVC Casing 15.674.0011.6732S/13E-30N02Pier Avenue - DeepPaso Robles 7/9/2013 Stove Pipe Top of PVC Casing 15.675.0810.5932S/13E-30N02Pier Avenue - DeepPaso Robles 4/10/2013 Stove Pipe Top of PVC Casing 15.679.076.60P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 254 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)32S/13E-30N02Pier Avenue - DeepPaso Robles 1/14/2013 Stove Pipe Top of PVC Casing 15.6711.154.5232S/13E-30N02Pier Avenue - DeepPaso Robles 10/29/2012 Stove Pipe Top of PVC Casing 15.677.618.0632S/13E-30N02Pier Avenue - DeepPaso Robles 7/23/2012 Stove Pipe Top of PVC Casing 15.677.827.8532S/13E-30N02Pier Avenue - DeepPaso Robles 4/18/2012 Stove Pipe Top of PVC Casing 15.6712.682.9932S/13E-30N02Pier Avenue - DeepPaso Robles 1/11/2012 Stove Pipe Top of PVC Casing 15.6711.254.4232S/13E-30N02Pier Avenue - DeepPaso Robles 11/21/2011 Stove Pipe Top of PVC Casing 15.6710.784.8932S/13E-30N02Pier Avenue - DeepPaso Robles 7/26/2011 Stove Pipe Top of PVC Casing 15.678.886.7932S/13E-30N02Pier Avenue - DeepPaso Robles 4/20/2011 Stove Pipe Top of PVC Casing 15.6710.005.6732S/13E-30N02Pier Avenue - DeepPaso Robles 1/24/2011 Stove Pipe Top of PVC Casing 15.679.865.8132S/13E-30N02Pier Avenue - DeepPaso Robles 10/21/2010 Stove Pipe Top of PVC Casing 15.673.1112.5632S/13E-30N02Pier Avenue - DeepPaso Robles 7/27/2010 Stove Pipe Top of PVC Casing 15.673.5112.1632S/13E-30N02Pier Avenue - DeepPaso Robles 4/27/2010 Stove Pipe Top of PVC Casing 15.677.398.2832S/13E-30N02Pier Avenue - DeepPaso Robles 2/25/2010 Stove Pipe Top of PVC Casing 15.6711.813.8632S/13E-30N02Pier Avenue - DeepPaso Robles 1/26/2010 Stove Pipe Top of PVC Casing 15.679.815.8632S/13E-30N02Pier Avenue - DeepPaso Robles 10/20/2009 Stove Pipe Top of PVC Casing 15.676.159.5232S/13E-30N02Pier Avenue - DeepPaso Robles 8/20/2009 Stove Pipe Top of PVC Casing 15.671.5914.0832S/13E-30N02Pier Avenue - DeepPaso Robles 5/11/2009 Stove Pipe Top of PVC Casing 15.676.559.1232S/13E-30N02Pier Avenue - DeepPaso Robles 10/15/2008 Stove Pipe Top of PVC Casing 15.671.3014.3732S/13E-30N02Pier Avenue - DeepPaso Robles 4/15/2008 Stove Pipe Top of PVC Casing 15.677.937.7432S/13E-30N02Pier Avenue - DeepPaso Robles 10/18/2007 Stove Pipe Top of PVC Casing 15.673.1812.4932S/13E-30N02Pier Avenue - DeepPaso Robles 4/17/2007 Stove Pipe Top of PVC Casing 15.676.738.9432S/13E-30N02Pier Avenue - DeepPaso Robles 10/19/2006 Stove Pipe Top of PVC Casing 15.678.467.2132S/13E-30N02Pier Avenue - DeepPaso Robles 4/25/2006 Stove Pipe Top of PVC Casing 15.6713.182.4932S/13E-30N02Pier Avenue - DeepPaso Robles 10/7/2005 Stove Pipe Top of PVC Casing 15.6711.034.6432S/13E-30N02Pier Avenue - DeepPaso Robles 4/29/2005 Stove Pipe Top of PVC Casing 15.6711.733.9432S/13E-30N02Pier Avenue - DeepPaso Robles 10/27/2004 Stove Pipe Top of PVC Casing 15.675.1310.5432S/13E-30N02Pier Avenue - DeepPaso Robles 4/8/2004 Stove Pipe Top of PVC Casing 15.679.636.0432S/13E-30N02Pier Avenue - DeepPaso Robles 10/17/2002 Stove Pipe Top of PVC Casing 15.677.338.3432S/13E-30N02Pier Avenue - DeepPaso Robles 10/5/2001 Stove Pipe Top of PVC Casing 15.679.835.8432S/13E-30N02Pier Avenue - DeepPaso Robles 4/23/2001 Stove Pipe Top of PVC Casing 15.6713.532.1432S/13E-30N02Pier Avenue - DeepPaso Robles 10/16/2000 Stove Pipe Top of PVC Casing 15.6710.635.0432S/13E-30N02Pier Avenue - DeepPaso Robles 4/24/2000 Stove Pipe Top of PVC Casing 15.6711.634.0432S/13E-30N02Pier Avenue - DeepPaso Robles 10/28/1999 Stove Pipe Top of PVC Casing 15.6710.555.1232S/13E-30N02Pier Avenue - DeepPaso Robles 4/15/1999 Stove Pipe Top of PVC Casing 15.6713.532.1432S/13E-30N02Pier Avenue - DeepPaso Robles 10/20/1998 Stove Pipe Top of PVC Casing 15.6710.235.4432S/13E-30N02Pier Avenue - DeepPaso Robles 4/22/1998 Stove Pipe Top of PVC Casing 15.6713.532.1432S/13E-30N02Pier Avenue - DeepPaso Robles 10/22/1997 Stove Pipe Top of PVC Casing 15.678.087.5932S/13E-30N02Pier Avenue - DeepPaso Robles 4/29/1997 Stove Pipe Top of PVC Casing 15.678.347.3332S/13E-30N02Pier Avenue - DeepPaso Robles 10/23/1996 Stove Pipe Top of PVC Casing 15.677.628.0532S/13E-30N02Pier Avenue - DeepPaso Robles 4/29/1996 Stove Pipe Top of PVC Casing 15.6710.435.2432S/13E-30N02Pier Avenue - DeepPaso Robles 10/10/1995 Stove Pipe Top of PVC Casing 15.674.3811.2932S/13E-30N02Pier Avenue - DeepPaso Robles 4/19/1995 Stove Pipe Top of PVC Casing 15.6711.933.7432S/13E-30N02Pier Avenue - DeepPaso Robles 11/1/1994 Stove Pipe Top of PVC Casing 15.676.439.2432S/13E-30N02Pier Avenue - DeepPaso Robles 4/11/1994 Stove Pipe Top of PVC Casing 15.679.925.7532S/13E-30N02Pier Avenue - DeepPaso Robles 10/13/1993 Stove Pipe Top of PVC Casing 15.675.0810.59P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 255 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)32S/13E-30N02Pier Avenue - DeepPaso Robles 4/8/1993 Stove Pipe Top of PVC Casing 15.6712.223.4532S/13E-30N02Pier Avenue - DeepPaso Robles 11/4/1992 Stove Pipe Top of PVC Casing 15.676.439.2432S/13E-30N02Pier Avenue - DeepPaso Robles 4/21/1992 Stove Pipe Top of PVC Casing 15.6710.265.4132S/13E-30N02Pier Avenue - DeepPaso Robles 10/11/1991 Stove Pipe Top of PVC Casing 15.674.7410.9332S/13E-30N02Pier Avenue - DeepPaso Robles 4/11/1991 Stove Pipe Top of PVC Casing 15.676.399.2832S/13E-30N02Pier Avenue - DeepPaso Robles 10/11/1990 Stove Pipe Top of PVC Casing 15.674.8310.8432S/13E-30N02Pier Avenue - DeepPaso Robles 4/24/1990 Stove Pipe Top of PVC Casing 15.678.137.5432S/13E-30N02Pier Avenue - DeepPaso Robles 10/4/1989 Stove Pipe Top of PVC Casing 15.677.198.4832S/13E-30N02Pier Avenue - DeepPaso Robles 4/17/1989 Stove Pipe Top of PVC Casing 15.679.056.6232S/13E-30N02Pier Avenue - DeepPaso Robles 10/20/1988 Stove Pipe Top of PVC Casing 15.676.259.4232S/13E-30N02Pier Avenue - DeepPaso Robles 4/29/1988 Stove Pipe Top of PVC Casing 15.6710.814.8632S/13E-30N02Pier Avenue - DeepPaso Robles 4/21/1988 Stove Pipe Top of PVC Casing 15.679.755.9232S/13E-30N02Pier Avenue - DeepPaso Robles 10/19/1987 Stove Pipe Top of PVC Casing 15.677.438.2432S/13E-30N02Pier Avenue - DeepPaso Robles 4/13/1987 Stove Pipe Top of PVC Casing 15.6712.313.3632S/13E-30N02Pier Avenue - DeepPaso Robles 11/5/1986 Stove Pipe Top of PVC Casing 15.678.686.9932S/13E-30N02Pier Avenue - DeepPaso Robles 4/15/1986 Stove Pipe Top of PVC Casing 15.6712.653.0232S/13E-30N02Pier Avenue - DeepPaso Robles 4/22/1985 Stove Pipe Top of PVC Casing 15.6713.462.2132S/13E-30N02Pier Avenue - DeepPaso Robles 10/24/1984 Stove Pipe Top of PVC Casing 15.6710.155.5232S/13E-30N02Pier Avenue - DeepPaso Robles 10/28/1983 Stove Pipe Top of PVC Casing 15.6713.532.1432S/13E-30N02Pier Avenue - DeepPaso Robles 5/6/1982 Stove Pipe Top of PVC Casing 15.6713.532.1432S/13E-30N02Pier Avenue - DeepPaso Robles 10/20/1981 Stove Pipe Top of PVC Casing 15.679.995.6832S/13E-30N02Pier Avenue - DeepPaso Robles 4/21/1981 Stove Pipe Top of PVC Casing 15.6713.532.1432S/13E-30N02Pier Avenue - DeepPaso Robles 10/10/1980 Stove Pipe Top of PVC Casing 15.6711.054.6232S/13E-30N02Pier Avenue - DeepPaso Robles 5/9/1980 Stove Pipe Top of PVC Casing 15.6713.532.1432S/13E-30N02Pier Avenue - DeepPaso Robles 11/7/1979 Stove Pipe Top of PVC Casing 15.6711.803.8732S/13E-30N02Pier Avenue - DeepPaso Robles 4/17/1979 Stove Pipe Top of PVC Casing 15.6713.532.1432S/13E-30N02Pier Avenue - DeepPaso Robles 12/4/1978 Stove Pipe Top of PVC Casing 15.6713.532.1432S/13E-30N02Pier Avenue - DeepPaso Robles 4/24/1978 Stove Pipe Top of PVC Casing 15.6713.532.1432S/13E-30N02Pier Avenue - DeepPaso Robles 11/7/1977 Stove Pipe Top of PVC Casing 15.678.647.0332S/13E-30N02Pier Avenue - DeepPaso Robles 5/17/1977 Stove Pipe Top of PVC Casing 15.6710.734.9432S/13E-30N02Pier Avenue - DeepPaso Robles 6/7/1976 Stove Pipe Top of PVC Casing 15.678.836.8432S/13E-30N02Pier Avenue - DeepPaso Robles 5/21/1976 Stove Pipe Top of PVC Casing 15.679.745.9332S/13E-30N02Pier Avenue - DeepPaso Robles 11/14/1975 Stove Pipe Top of PVC Casing 15.6713.532.1432S/13E-30N02Pier Avenue - DeepPaso Robles 7/7/1975 Stove Pipe Top of PVC Casing 15.6711.004.6732S/13E-30N02Pier Avenue - DeepPaso Robles 4/1/1975 Stove Pipe Top of PVC Casing 15.6713.532.1432S/13E-30N02Pier Avenue - DeepPaso Robles 6/7/1974 Stove Pipe Top of PVC Casing 15.6713.532.1432S/13E-30N02Pier Avenue - DeepPaso Robles 9/20/1973 Stove Pipe Top of PVC Casing 15.6712.503.1732S/13E-30N02Pier Avenue - DeepPaso Robles 6/29/1972 Stove Pipe Top of PVC Casing 15.679.186.4932S/13E-30N02Pier Avenue - DeepPaso Robles 2/29/1972 Stove Pipe Top of PVC Casing 15.6713.532.1432S/13E-30N02Pier Avenue - DeepPaso Robles 11/29/1971 Stove Pipe Top of PVC Casing 15.6713.532.1432S/13E-30N02Pier Avenue - DeepPaso Robles 8/26/1971 Stove Pipe Top of PVC Casing 15.6710.535.1432S/13E-30N02Pier Avenue - DeepPaso Robles 6/2/1971 Stove Pipe Top of PVC Casing 15.6712.653.0232S/13E-30N02Pier Avenue - DeepPaso Robles 3/2/1971 Stove Pipe Top of PVC Casing 15.6713.532.1432S/13E-30N02Pier Avenue - DeepPaso Robles 12/15/1969 Stove Pipe Top of PVC Casing 15.6713.532.1432S/13E-30N02Pier Avenue - DeepPaso Robles 5/22/1969 Stove Pipe Top of PVC Casing 15.6712.053.62P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 256 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)32S/13E-30N02Pier Avenue - DeepPaso Robles 4/18/1969 Stove Pipe Top of PVC Casing 15.6713.532.1432S/13E-30N02Pier Avenue - DeepPaso Robles 3/20/1969 Stove Pipe Top of PVC Casing 15.6713.532.1432S/13E-30N02Pier Avenue - DeepPaso Robles 2/21/1969 Stove Pipe Top of PVC Casing 15.6713.532.1432S/13E-30N02Pier Avenue - DeepPaso Robles 1/15/1969 Stove Pipe Top of PVC Casing 15.6711.124.5532S/13E-30N02Pier Avenue - DeepPaso Robles 12/12/1968 Stove Pipe Top of PVC Casing 15.679.416.2632S/13E-30N02Pier Avenue - DeepPaso Robles 11/14/1968 Stove Pipe Top of PVC Casing 15.678.057.6232S/13E-30N02Pier Avenue - DeepPaso Robles 10/17/1968 Stove Pipe Top of PVC Casing 15.675.4710.2032S/13E-30N02Pier Avenue - DeepPaso Robles 9/14/1968 Stove Pipe Top of PVC Casing 15.674.3111.3632S/13E-30N02Pier Avenue - DeepPaso Robles 8/13/1968 Stove Pipe Top of PVC Casing 15.675.0610.6132S/13E-30N02Pier Avenue - DeepPaso Robles 3/21/1968 Stove Pipe Top of PVC Casing 15.6712.163.5132S/13E-30N02Pier Avenue - DeepPaso Robles 2/22/1968 Stove Pipe Top of PVC Casing 15.6712.792.8832S/13E-30N02Pier Avenue - DeepPaso Robles 1/17/1968 Stove Pipe Top of PVC Casing 15.6712.513.1632S/13E-30N02Pier Avenue - DeepPaso Robles 12/8/1967 Stove Pipe Top of PVC Casing 15.6711.394.2832S/13E-30N02Pier Avenue - DeepPaso Robles 11/13/1967 Stove Pipe Top of PVC Casing 15.679.496.1832S/13E-30N02Pier Avenue - DeepPaso Robles 10/9/1967 Stove Pipe Top of PVC Casing 15.679.076.6032S/13E-30N02Pier Avenue - DeepPaso Robles 9/5/1967 Stove Pipe Top of PVC Casing 15.678.507.1732S/13E-30N02Pier Avenue - DeepPaso Robles 8/8/1967 Stove Pipe Top of PVC Casing 15.678.826.8532S/13E-30N02Pier Avenue - DeepPaso Robles 7/12/1967 Stove Pipe Top of PVC Casing 15.6711.763.9132S/13E-30N02Pier Avenue - DeepPaso Robles 6/1/1967 Stove Pipe Top of PVC Casing 15.6711.634.0432S/13E-30N02Pier Avenue - DeepPaso Robles 5/2/1967 Stove Pipe Top of PVC Casing 15.6713.532.14P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 257 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)32S/13E-31H10Oceano CSD - GreenPaso Robles 10/10/2023 Manhole Top of casing (steel) 30.4911.3719.1232S/13E-31H10Oceano CSD - GreenPaso Robles 7/4/2023 Manhole Top of casing (steel) 30.4913.0617.4332S/13E-31H10Oceano CSD - GreenPaso Robles 4/11/2023 Manhole Top of casing (steel) 30.4915.4315.0632S/13E-31H10Oceano CSD - GreenPaso Robles 2/7/2023 Manhole Top of casing (steel) 30.4912.1718.3232S/13E-31H10Oceano CSD - GreenPaso Robles 10/3/2022 Manhole Top of casing (steel) 30.493.8426.6532S/13E-31H10Oceano CSD - GreenPaso Robles 7/11/2022 Manhole Top of casing (steel) 30.493.2927.2032S/13E-31H10Oceano CSD - GreenPaso Robles 4/5/2022 Manhole Top of casing (steel) 30.497.9722.5232S/13E-31H10Oceano CSD - GreenPaso Robles 1/4/2022 Manhole Top of casing (steel) 30.498.9421.5532S/13E-31H10Oceano CSD - GreenPaso Robles 10/5/2021 Manhole Top of casing (steel) 30.495.0425.4532S/13E-31H10Oceano CSD - GreenPaso Robles 7/13/2021 Manhole Top of casing (steel) 30.495.2625.2332S/13E-31H10Oceano CSD - GreenPaso Robles 4/6/2021 Manhole Top of casing (steel) 30.498.7721.7232S/13E-31H10Oceano CSD - GreenPaso Robles 1/6/2021 Manhole Top of casing (steel) 30.4910.4720.0232S/13E-31H10Oceano CSD - GreenPaso Robles 10/7/2020 Manhole Top of casing (steel) 30.495.8624.6332S/13E-31H10Oceano CSD - GreenPaso Robles 7/6/2020 Manhole Top of casing (steel) 30.498.6421.8532S/13E-31H10Oceano CSD - GreenPaso Robles 4/7/2020 Manhole Top of casing (steel) 30.4912.0918.4032S/13E-31H10Oceano CSD - GreenPaso Robles 1/7/2020 Manhole Top of casing (steel) 30.4910.6019.8932S/13E-31H10Oceano CSD - GreenPaso Robles 10/9/2019 Manhole Top of casing (steel) 30.497.1323.3632S/13E-31H10Oceano CSD - GreenPaso Robles 7/9/2019 Manhole Top of casing (steel) 30.495.9524.5432S/13E-31H10Oceano CSD - GreenPaso Robles 4/9/2019 Manhole Top of casing (steel) 30.4912.2818.2132S/13E-31H10Oceano CSD - GreenPaso Robles 1/8/2019 Manhole Top of casing (steel) 30.4910.1520.3432S/13E-31H10Oceano CSD - GreenPaso Robles 10/9/2018 Manhole Top of casing (steel) 30.497.2823.2132S/13E-31H10Oceano CSD - GreenPaso Robles 7/10/2018 Manhole Top of casing (steel) 30.496.6923.8032S/13E-31H10Oceano CSD - GreenPaso Robles 4/10/2018 Manhole Top of casing (steel) 30.4910.4820.0132S/13E-31H10Oceano CSD - GreenPaso Robles 1/10/2018 Manhole Top of casing (steel) 30.4910.4820.0132S/13E-31H10Oceano CSD - GreenPaso Robles 10/10/2017 Manhole Top of casing (steel) 30.498.1022.3932S/13E-31H10Oceano CSD - GreenPaso Robles 7/11/2017 Manhole Top of casing (steel) 30.499.5220.9732S/13E-31H10Oceano CSD - GreenPaso Robles 4/11/2017 Manhole Top of casing (steel) 30.4912.6517.8432S/13E-31H10Oceano CSD - GreenPaso Robles 1/10/2017 Manhole Top of casing (steel) 30.4910.1320.3632S/13E-31H10Oceano CSD - GreenPaso Robles 10/12/2016 Manhole Top of casing (steel) 30.493.8926.6032S/13E-31H10Oceano CSD - GreenPaso Robles 7/19/2016 Manhole Top of casing (steel) 30.494.8625.6332S/13E-31H10Oceano CSD - GreenPaso Robles 4/12/2016 Manhole Top of casing (steel) 30.498.9921.5032S/13E-31H10Oceano CSD - GreenPaso Robles 1/12/2016 Manhole Top of casing (steel) 30.499.6620.8332S/13E-31H10Oceano CSD - GreenPaso Robles 10/13/2015 Manhole Top of casing (steel) 30.492.7527.7432S/13E-31H10Oceano CSD - GreenPaso Robles 7/14/2015 Manhole Top of casing (steel) 30.493.0227.4732S/13E-31H10Oceano CSD - GreenPaso Robles 4/14/2015 Manhole Top of casing (steel) 30.495.8224.6732S/13E-31H10Oceano CSD - GreenPaso Robles 1/13/2015 Manhole Top of casing (steel) 30.498.5221.9732S/13E-31H10Oceano CSD - GreenPaso Robles 10/14/2014 Manhole Top of casing (steel) 30.492.9927.5032S/13E-31H10Oceano CSD - GreenPaso Robles 7/29/2014 Manhole Top of casing (steel) 30.492.3328.1632S/13E-31H10Oceano CSD - GreenPaso Robles 6/4/2014 Manhole Top of casing (steel) 30.491.8128.6832S/13E-31H10Oceano CSD - GreenPaso Robles 4/15/2014 Manhole Top of casing (steel) 30.496.6523.8432S/13E-31H10Oceano CSD - GreenPaso Robles 1/14/2014 Manhole Top of casing (steel) 30.496.0824.4132S/13E-31H10Oceano CSD - GreenPaso Robles 10/14/2013 Manhole Top of casing (steel) 30.494.3226.1732S/13E-31H10Oceano CSD - GreenPaso Robles 7/9/2013 Manhole Top of casing (steel) 30.494.6525.8432S/13E-31H10Oceano CSD - GreenPaso Robles 4/10/2013 Manhole Top of casing (steel) 30.4911.3319.1632S/13E-31H10Oceano CSD - GreenPaso Robles 1/14/2013 Manhole Top of casing (steel) 30.4911.0419.45P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 258 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)32S/13E-31H10Oceano CSD - GreenPaso Robles 10/30/2012 Manhole Top of casing (steel) 30.497.3223.1732S/13E-31H10Oceano CSD - GreenPaso Robles 7/25/2012 Manhole Top of casing (steel) 30.497.4823.0132S/13E-31H10Oceano CSD - GreenPaso Robles 4/18/2012 Manhole Top of casing (steel) 30.4912.9817.5132S/13E-31H10Oceano CSD - GreenPaso Robles 1/12/2012 Manhole Top of casing (steel) 30.4911.3419.1532S/13E-31H10Oceano CSD - GreenPaso Robles 11/21/2011 Manhole Top of casing (steel) 30.4912.1718.3232S/13E-31H10Oceano CSD - GreenPaso Robles 7/26/2011 Manhole Top of casing (steel) 30.499.1221.3732S/13E-31H10Oceano CSD - GreenPaso Robles 4/20/2011 Manhole Top of casing (steel) 30.49-80.16110.6532S/13E-31H10Oceano CSD - GreenPaso Robles 1/24/2011 Manhole Top of casing (steel) 30.49-71.96102.4532S/13E-31H10Oceano CSD - GreenPaso Robles 10/21/2010 Manhole Top of casing (steel) 30.49-82.22112.7132S/13E-31H10Oceano CSD - GreenPaso Robles 7/26/2010 Manhole Top of casing (steel) 30.49-65.1295.6132S/13E-31H10Oceano CSD - GreenPaso Robles 4/26/2010 Manhole Top of casing (steel) 30.49-33.4163.9032S/13E-31H10Oceano CSD - GreenPaso Robles 1/27/2010 Manhole Top of casing (steel) 30.49-13.2243.7132S/13E-31H10Oceano CSD - GreenPaso Robles 10/20/2009 Manhole Top of casing (steel) 30.491.2929.2032S/13E-31H10Oceano CSD - GreenPaso Robles 8/19/2009 Manhole Top of casing (steel) 30.495.9424.5532S/13E-31H10Oceano CSD - GreenPaso Robles 4/7/2009 Manhole Top of casing (steel) 30.492.3728.1232S/13E-31H10Oceano CSD - GreenPaso Robles 10/15/2008 Manhole Top of casing (steel) 30.492.6527.8432S/13E-31H10Oceano CSD - GreenPaso Robles 4/16/2008 Manhole Top of casing (steel) 30.493.6726.8232S/13E-31H10Oceano CSD - GreenPaso Robles 10/18/2007 Manhole Top of casing (steel) 30.493.3927.1032S/13E-31H10Oceano CSD - GreenPaso Robles 4/18/2007 Manhole Top of casing (steel) 30.495.3425.1532S/13E-31H10Oceano CSD - GreenPaso Robles 10/16/2006 Manhole Top of casing (steel) 30.495.0925.4032S/13E-31H10Oceano CSD - GreenPaso Robles 4/11/2006 Manhole Top of casing (steel) 30.494.8925.6032S/13E-31H10Oceano CSD - GreenPaso Robles 10/31/2005 Manhole Top of casing (steel) 30.493.9926.5032S/13E-31H10Oceano CSD - GreenPaso Robles 10/5/2001 Manhole Top of casing (steel) 30.4910.3920.1032S/13E-31H10Oceano CSD - GreenPaso Robles 4/25/2001 Manhole Top of casing (steel) 30.4910.4920.0032S/13E-31H10Oceano CSD - GreenPaso Robles 10/4/2000 Manhole Top of casing (steel) 30.499.5920.9032S/13E-31H10Oceano CSD - GreenPaso Robles 4/14/2000 Manhole Top of casing (steel) 30.4914.3916.1032S/13E-31H10Oceano CSD - GreenPaso Robles 10/27/1999 Manhole Top of casing (steel) 30.499.0921.4032S/13E-31H10Oceano CSD - GreenPaso Robles 10/23/1998 Manhole Top of casing (steel) 30.4910.6919.8032S/13E-31H10Oceano CSD - GreenPaso Robles 10/21/1998 Manhole Top of casing (steel) 30.4910.9919.5032S/13E-31H10Oceano CSD - GreenPaso Robles 4/28/1997 Manhole Top of casing (steel) 30.4910.1920.3032S/13E-31H10Oceano CSD - GreenPaso Robles 4/16/1996 Manhole Top of casing (steel) 30.499.7920.7032S/13E-31H10Oceano CSD - GreenPaso Robles 10/4/1995 Manhole Top of casing (steel) 30.499.3021.1932S/13E-31H10Oceano CSD - GreenPaso Robles 4/7/1995 Manhole Top of casing (steel) 30.497.9922.5032S/13E-31H10Oceano CSD - GreenPaso Robles 4/13/1994 Manhole Top of casing (steel) 30.4910.2920.2032S/13E-31H10Oceano CSD - GreenPaso Robles 10/5/1993 Manhole Top of casing (steel) 30.499.3921.1032S/13E-31H10Oceano CSD - GreenPaso Robles 4/6/1993 Manhole Top of casing (steel) 30.4910.7619.7332S/13E-31H10Oceano CSD - GreenPaso Robles 10/14/1992 Manhole Top of casing (steel) 30.496.8023.6932S/13E-31H10Oceano CSD - GreenPaso Robles 4/15/1992 Manhole Top of casing (steel) 30.496.2924.2032S/13E-31H10Oceano CSD - GreenPaso Robles 10/7/1991 Manhole Top of casing (steel) 30.494.3926.1032S/13E-31H10Oceano CSD - GreenPaso Robles 4/4/1991 Manhole Top of casing (steel) 30.494.9925.5032S/13E-31H10Oceano CSD - GreenPaso Robles 10/4/1990 Manhole Top of casing (steel) 30.494.7925.7032S/13E-31H10Oceano CSD - GreenPaso Robles 4/11/1990 Manhole Top of casing (steel) 30.497.4923.0032S/13E-31H10Oceano CSD - GreenPaso Robles 10/4/1989 Manhole Top of casing (steel) 30.495.8924.6032S/13E-31H10Oceano CSD - GreenPaso Robles 10/3/1984 Manhole Top of casing (steel) 30.498.5921.9032S/13E-31H10Oceano CSD - GreenPaso Robles 10/14/1983 Manhole Top of casing (steel) 30.4912.9417.55P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 259 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)32S/13E-31H10Oceano CSD - GreenPaso Robles 5/16/1983 Manhole Top of casing (steel) 30.4914.6915.80P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 260 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)32S/13E-31H11Oceano CSD - BluePaso Robles 10/10/2023 Manhole Top of casing (steel) 30.5410.2320.3132S/13E-31H11Oceano CSD - BluePaso Robles 7/4/2023 Manhole Top of casing (steel) 30.5412.1018.4432S/13E-31H11Oceano CSD - BluePaso Robles 4/11/2023 Manhole Top of casing (steel) 30.5414.5615.9832S/13E-31H11Oceano CSD - BluePaso Robles 2/7/2023 Manhole Top of casing (steel) 30.5411.5019.0432S/13E-31H11Oceano CSD - BluePaso Robles 10/3/2022 Manhole Top of casing (steel) 30.542.6927.8532S/13E-31H11Oceano CSD - BluePaso Robles 7/11/2022 Manhole Top of casing (steel) 30.541.9428.6032S/13E-31H11Oceano CSD - BluePaso Robles 4/5/2022 Manhole Top of casing (steel) 30.547.1623.3832S/13E-31H11Oceano CSD - BluePaso Robles 1/4/2022 Manhole Top of casing (steel) 30.548.5921.9532S/13E-31H11Oceano CSD - BluePaso Robles 10/5/2021 Manhole Top of casing (steel) 30.543.9926.5532S/13E-31H11Oceano CSD - BluePaso Robles 7/13/2021 Manhole Top of casing (steel) 30.544.7025.8432S/13E-31H11Oceano CSD - BluePaso Robles 4/6/2021 Manhole Top of casing (steel) 30.548.4122.1332S/13E-31H11Oceano CSD - BluePaso Robles 1/6/2021 Manhole Top of casing (steel) 30.548.1222.4232S/13E-31H11Oceano CSD - BluePaso Robles 10/7/2020 Manhole Top of casing (steel) 30.544.9225.6232S/13E-31H11Oceano CSD - BluePaso Robles 7/6/2020 Manhole Top of casing (steel) 30.547.5622.9832S/13E-31H11Oceano CSD - BluePaso Robles 4/7/2020 Manhole Top of casing (steel) 30.5412.2118.3332S/13E-31H11Oceano CSD - BluePaso Robles 1/7/2020 Manhole Top of casing (steel) 30.5410.9019.6432S/13E-31H11Oceano CSD - BluePaso Robles 10/9/2019 Manhole Top of casing (steel) 30.546.3224.2232S/13E-31H11Oceano CSD - BluePaso Robles 7/9/2019 Manhole Top of casing (steel) 30.547.9422.6032S/13E-31H11Oceano CSD - BluePaso Robles 4/9/2019 Manhole Top of casing (steel) 30.5412.0218.5232S/13E-31H11Oceano CSD - BluePaso Robles 1/8/2019 Manhole Top of casing (steel) 30.549.4521.0932S/13E-31H11Oceano CSD - BluePaso Robles 10/9/2018 Manhole Top of casing (steel) 30.545.8124.7332S/13E-31H11Oceano CSD - BluePaso Robles 7/10/2018 Manhole Top of casing (steel) 30.546.0324.5132S/13E-31H11Oceano CSD - BluePaso Robles 4/10/2018 Manhole Top of casing (steel) 30.5410.6519.8932S/13E-31H11Oceano CSD - BluePaso Robles 1/10/2018 Manhole Top of casing (steel) 30.549.5520.9932S/13E-31H11Oceano CSD - BluePaso Robles 10/10/2017 Manhole Top of casing (steel) 30.546.6023.9432S/13E-31H11Oceano CSD - BluePaso Robles 7/11/2017 Manhole Top of casing (steel) 30.548.4522.0932S/13E-31H11Oceano CSD - BluePaso Robles 4/11/2017 Manhole Top of casing (steel) 30.5412.7317.8132S/13E-31H11Oceano CSD - BluePaso Robles 1/10/2017 Manhole Top of casing (steel) 30.549.6320.9132S/13E-31H11Oceano CSD - BluePaso Robles 10/12/2016 Manhole Top of casing (steel) 30.543.8926.6532S/13E-31H11Oceano CSD - BluePaso Robles 7/19/2016 Manhole Top of casing (steel) 30.545.0125.5332S/13E-31H11Oceano CSD - BluePaso Robles 4/12/2016 Manhole Top of casing (steel) 30.549.5021.0432S/13E-31H11Oceano CSD - BluePaso Robles 1/12/2016 Manhole Top of casing (steel) 30.548.5422.0032S/13E-31H11Oceano CSD - BluePaso Robles 10/13/2015 Manhole Top of casing (steel) 30.541.9328.6132S/13E-31H11Oceano CSD - BluePaso Robles 7/14/2015 Manhole Top of casing (steel) 30.542.4228.1232S/13E-31H11Oceano CSD - BluePaso Robles 4/14/2015 Manhole Top of casing (steel) 30.546.2224.3232S/13E-31H11Oceano CSD - BluePaso Robles 1/13/2015 Manhole Top of casing (steel) 30.548.6521.8932S/13E-31H11Oceano CSD - BluePaso Robles 10/14/2014 Manhole Top of casing (steel) 30.541.9328.6132S/13E-31H11Oceano CSD - BluePaso Robles 7/29/2014 Manhole Top of casing (steel) 30.541.9428.6032S/13E-31H11Oceano CSD - BluePaso Robles 6/4/2014 Manhole Top of casing (steel) 30.540.6129.9332S/13E-31H11Oceano CSD - BluePaso Robles 4/15/2014 Manhole Top of casing (steel) 30.547.5622.9832S/13E-31H11Oceano CSD - BluePaso Robles 1/14/2014 Manhole Top of casing (steel) 30.546.7723.7732S/13E-31H11Oceano CSD - BluePaso Robles 10/14/2013 Manhole Top of casing (steel) 30.543.6526.8932S/13E-31H11Oceano CSD - BluePaso Robles 7/9/2013 Manhole Top of casing (steel) 30.545.2725.2732S/13E-31H11Oceano CSD - BluePaso Robles 4/10/2013 Manhole Top of casing (steel) 30.5410.1820.3632S/13E-31H11Oceano CSD - BluePaso Robles 1/14/2013 Manhole Top of casing (steel) 30.5411.4919.05P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 261 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)32S/13E-31H11Oceano CSD - BluePaso Robles 10/30/2012 Manhole Top of casing (steel) 30.546.9523.5932S/13E-31H11Oceano CSD - BluePaso Robles 7/25/2012 Manhole Top of casing (steel) 30.547.4523.0932S/13E-31H11Oceano CSD - BluePaso Robles 4/18/2012 Manhole Top of casing (steel) 30.5414.5316.0132S/13E-31H11Oceano CSD - BluePaso Robles 1/12/2012 Manhole Top of casing (steel) 30.5412.3718.1732S/13E-31H11Oceano CSD - BluePaso Robles 11/21/2011 Manhole Top of casing (steel) 30.5411.9018.6432S/13E-31H11Oceano CSD - BluePaso Robles 7/26/2011 Manhole Top of casing (steel) 30.549.3421.2032S/13E-31H11Oceano CSD - BluePaso Robles 4/20/2011 Manhole Top of casing (steel) 30.5412.0418.5032S/13E-31H11Oceano CSD - BluePaso Robles 1/24/2011 Manhole Top of casing (steel) 30.549.7620.7832S/13E-31H11Oceano CSD - BluePaso Robles 10/21/2010 Manhole Top of casing (steel) 30.540.4330.1132S/13E-31H11Oceano CSD - BluePaso Robles 7/26/2010 Manhole Top of casing (steel) 30.545.8024.7432S/13E-31H11Oceano CSD - BluePaso Robles 4/26/2010 Manhole Top of casing (steel) 30.5412.0218.5232S/13E-31H11Oceano CSD - BluePaso Robles 1/27/2010 Manhole Top of casing (steel) 30.548.4822.0632S/13E-31H11Oceano CSD - BluePaso Robles 10/20/2009 Manhole Top of casing (steel) 30.543.0427.5032S/13E-31H11Oceano CSD - BluePaso Robles 8/19/2009 Manhole Top of casing (steel) 30.545.8924.6532S/13E-31H11Oceano CSD - BluePaso Robles 4/7/2009 Manhole Top of casing (steel) 30.542.8927.6532S/13E-31H11Oceano CSD - BluePaso Robles 10/15/2008 Manhole Top of casing (steel) 30.541.2529.2932S/13E-31H11Oceano CSD - BluePaso Robles 4/16/2008 Manhole Top of casing (steel) 30.543.5626.9832S/13E-31H11Oceano CSD - BluePaso Robles 10/18/2007 Manhole Top of casing (steel) 30.542.3428.2032S/13E-31H11Oceano CSD - BluePaso Robles 4/18/2007 Manhole Top of casing (steel) 30.545.7924.7532S/13E-31H11Oceano CSD - BluePaso Robles 10/16/2006 Manhole Top of casing (steel) 30.544.9425.6032S/13E-31H11Oceano CSD - BluePaso Robles 4/11/2006 Manhole Top of casing (steel) 30.546.4424.1032S/13E-31H11Oceano CSD - BluePaso Robles 10/31/2005 Manhole Top of casing (steel) 30.544.1926.3532S/13E-31H11Oceano CSD - BluePaso Robles 10/5/2001 Manhole Top of casing (steel) 30.5412.3418.2032S/13E-31H11Oceano CSD - BluePaso Robles 4/25/2001 Manhole Top of casing (steel) 30.5413.7416.8032S/13E-31H11Oceano CSD - BluePaso Robles 10/4/2000 Manhole Top of casing (steel) 30.5411.4419.1032S/13E-31H11Oceano CSD - BluePaso Robles 4/14/2000 Manhole Top of casing (steel) 30.5418.1412.4032S/13E-31H11Oceano CSD - BluePaso Robles 10/27/1999 Manhole Top of casing (steel) 30.5413.4417.1032S/13E-31H11Oceano CSD - BluePaso Robles 10/21/1998 Manhole Top of casing (steel) 30.5414.3416.2032S/13E-31H11Oceano CSD - BluePaso Robles 4/23/1998 Manhole Top of casing (steel) 30.5415.8414.7032S/13E-31H11Oceano CSD - BluePaso Robles 10/22/1997 Manhole Top of casing (steel) 30.547.3423.2032S/13E-31H11Oceano CSD - BluePaso Robles 4/28/1997 Manhole Top of casing (steel) 30.5412.5418.0032S/13E-31H11Oceano CSD - BluePaso Robles 4/16/1996 Manhole Top of casing (steel) 30.5412.6417.9032S/13E-31H11Oceano CSD - BluePaso Robles 10/4/1995 Manhole Top of casing (steel) 30.5410.5420.0032S/13E-31H11Oceano CSD - BluePaso Robles 4/7/1995 Manhole Top of casing (steel) 30.5413.9416.6032S/13E-31H11Oceano CSD - BluePaso Robles 4/13/1994 Manhole Top of casing (steel) 30.549.6420.9032S/13E-31H11Oceano CSD - BluePaso Robles 10/5/1993 Manhole Top of casing (steel) 30.548.7421.8032S/13E-31H11Oceano CSD - BluePaso Robles 4/6/1993 Manhole Top of casing (steel) 30.5411.6218.9232S/13E-31H11Oceano CSD - BluePaso Robles 10/14/1992 Manhole Top of casing (steel) 30.545.0825.4632S/13E-31H11Oceano CSD - BluePaso Robles 4/14/1992 Manhole Top of casing (steel) 30.548.6421.9032S/13E-31H11Oceano CSD - BluePaso Robles 10/7/1991 Manhole Top of casing (steel) 30.545.2425.3032S/13E-31H11Oceano CSD - BluePaso Robles 4/4/1991 Manhole Top of casing (steel) 30.546.4424.1032S/13E-31H11Oceano CSD - BluePaso Robles 10/4/1990 Manhole Top of casing (steel) 30.543.5427.0032S/13E-31H11Oceano CSD - BluePaso Robles 4/11/1990 Manhole Top of casing (steel) 30.548.0422.5032S/13E-31H11Oceano CSD - BluePaso Robles 10/4/1989 Manhole Top of casing (steel) 30.546.8423.7032S/13E-31H11Oceano CSD - BluePaso Robles 10/13/1984 Manhole Top of casing (steel) 30.547.2423.30P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 262 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)32S/13E-31H11Oceano CSD - BluePaso Robles 10/3/1984 Manhole Top of casing (steel) 30.547.2423.3032S/13E-31H11Oceano CSD - BluePaso Robles 10/14/1983 Manhole Top of casing (steel) 30.5414.3616.1832S/13E-31H11Oceano CSD - BluePaso Robles 5/16/1983 Manhole Top of casing (steel) 30.5417.2413.30P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 263 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)32S/13E-31H12Oceano CSD - SilverCareaga 10/10/2023 Manhole Top of casing (steel) 30.4812.7717.7132S/13E-31H12Oceano CSD - SilverCareaga7/4/2023 Manhole Top of casing (steel) 30.4814.7115.7732S/13E-31H12Oceano CSD - SilverCareaga4/11/2023 Manhole Top of casing (steel) 30.483.4527.0332S/13E-31H12Oceano CSD - SilverCareaga2/7/2023 Manhole Top of casing (steel) 30.4811.1119.3732S/13E-31H12Oceano CSD - SilverCareaga10/3/2022 Manhole Top of casing (steel) 30.483.8326.6532S/13E-31H12Oceano CSD - SilverCareaga7/11/2022 Manhole Top of casing (steel) 30.48-7.8738.3532S/13E-31H12Oceano CSD - SilverCareaga4/5/2022 Manhole Top of casing (steel) 30.48-1.2731.7532S/13E-31H12Oceano CSD - SilverCareaga1/4/2022 Manhole Top of casing (steel) 30.487.9122.5732S/13E-31H12Oceano CSD - SilverCareaga10/5/2021 Manhole Top of casing (steel) 30.48-3.0133.4932S/13E-31H12Oceano CSD - SilverCareaga7/13/2021 Manhole Top of casing (steel) 30.48-0.0830.5632S/13E-31H12Oceano CSD - SilverCareaga4/6/2021 Manhole Top of casing (steel) 30.489.3721.1132S/13E-31H12Oceano CSD - SilverCareaga1/6/2021 Manhole Top of casing (steel) 30.489.4621.0232S/13E-31H12Oceano CSD - SilverCareaga10/7/2020 Manhole Top of casing (steel) 30.486.2924.1932S/13E-31H12Oceano CSD - SilverCareaga7/6/2020 Manhole Top of casing (steel) 30.489.7120.7732S/13E-31H12Oceano CSD - SilverCareaga4/7/2020 Manhole Top of casing (steel) 30.4813.2817.2032S/13E-31H12Oceano CSD - SilverCareaga1/7/2020 Manhole Top of casing (steel) 30.4811.9218.5632S/13E-31H12Oceano CSD - SilverCareaga10/9/2019 Manhole Top of casing (steel) 30.488.1322.3532S/13E-31H12Oceano CSD - SilverCareaga7/9/2019 Manhole Top of casing (steel) 30.4810.0420.4432S/13E-31H12Oceano CSD - SilverCareaga4/9/2019 Manhole Top of casing (steel) 30.486.7323.7532S/13E-31H12Oceano CSD - SilverCareaga1/8/2019 Manhole Top of casing (steel) 30.486.4824.0032S/13E-31H12Oceano CSD - SilverCareaga10/9/2018 Manhole Top of casing (steel) 30.48-4.5235.0032S/13E-31H12Oceano CSD - SilverCareaga7/10/2018 Manhole Top of casing (steel) 30.485.7124.7732S/13E-31H12Oceano CSD - SilverCareaga4/10/2018 Manhole Top of casing (steel) 30.4811.1319.3532S/13E-31H12Oceano CSD - SilverCareaga1/10/2018 Manhole Top of casing (steel) 30.4810.7319.7532S/13E-31H12Oceano CSD - SilverCareaga 10/10/2017 Manhole Top of casing (steel) 30.486.5723.9132S/13E-31H12Oceano CSD - SilverCareaga7/11/2017 Manhole Top of casing (steel) 30.4810.5419.9432S/13E-31H12Oceano CSD - SilverCareaga4/11/2017 Manhole Top of casing (steel) 30.4813.4916.9932S/13E-31H12Oceano CSD - SilverCareaga1/10/2017 Manhole Top of casing (steel) 30.489.8320.6532S/13E-31H12Oceano CSD - SilverCareaga 10/12/2016 Manhole Top of casing (steel) 30.483.6326.8532S/13E-31H12Oceano CSD - SilverCareaga7/19/2016 Manhole Top of casing (steel) 30.483.5326.9532S/13E-31H12Oceano CSD - SilverCareaga4/12/2016 Manhole Top of casing (steel) 30.489.3121.1732S/13E-31H12Oceano CSD - SilverCareaga1/12/2016 Manhole Top of casing (steel) 30.489.0421.4432S/13E-31H12Oceano CSD - SilverCareaga 10/13/2015 Manhole Top of casing (steel) 30.482.3328.1532S/13E-31H12Oceano CSD - SilverCareaga7/14/2015 Manhole Top of casing (steel) 30.482.0528.4332S/13E-31H12Oceano CSD - SilverCareaga4/14/2015 Manhole Top of casing (steel) 30.484.2526.2332S/13E-31H12Oceano CSD - SilverCareaga1/13/2015 Manhole Top of casing (steel) 30.488.4422.0432S/13E-31H12Oceano CSD - SilverCareaga 10/14/2014 Manhole Top of casing (steel) 30.48-8.3838.8632S/13E-31H12Oceano CSD - SilverCareaga7/29/2014 Manhole Top of casing (steel) 30.480.9829.5032S/13E-31H12Oceano CSD - SilverCareaga6/4/2014 Manhole Top of casing (steel) 30.48-1.7032.1832S/13E-31H12Oceano CSD - SilverCareaga4/15/2014 Manhole Top of casing (steel) 30.48-7.5738.0532S/13E-31H12Oceano CSD - SilverCareaga1/14/2014 Manhole Top of casing (steel) 30.486.8523.6332S/13E-31H12Oceano CSD - SilverCareaga 10/14/2013 Manhole Top of casing (steel) 30.483.7126.7732S/13E-31H12Oceano CSD - SilverCareaga7/9/2013 Manhole Top of casing (steel) 30.483.7226.7632S/13E-31H12Oceano CSD - SilverCareaga4/10/2013 Manhole Top of casing (steel) 30.488.5521.9332S/13E-31H12Oceano CSD - SilverCareaga1/14/2013 Manhole Top of casing (steel) 30.4811.5118.97P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 264 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)32S/13E-31H12Oceano CSD - SilverCareaga 10/30/2012 Manhole Top of casing (steel) 30.487.4922.9932S/13E-31H12Oceano CSD - SilverCareaga7/25/2012 Manhole Top of casing (steel) 30.486.9523.5332S/13E-31H12Oceano CSD - SilverCareaga4/18/2012 Manhole Top of casing (steel) 30.4814.5015.9832S/13E-31H12Oceano CSD - SilverCareaga1/11/2012 Manhole Top of casing (steel) 30.4811.6318.8532S/13E-31H12Oceano CSD - SilverCareaga 11/21/2011 Manhole Top of casing (steel) 30.4811.7818.7032S/13E-31H12Oceano CSD - SilverCareaga7/26/2011 Manhole Top of casing (steel) 30.489.4021.0832S/13E-31H12Oceano CSD - SilverCareaga4/20/2011 Manhole Top of casing (steel) 30.4813.3617.1232S/13E-31H12Oceano CSD - SilverCareaga1/24/2011 Manhole Top of casing (steel) 30.4812.6117.8732S/13E-31H12Oceano CSD - SilverCareaga 10/21/2010 Manhole Top of casing (steel) 30.485.5224.9632S/13E-31H12Oceano CSD - SilverCareaga7/26/2010 Manhole Top of casing (steel) 30.486.2424.2432S/13E-31H12Oceano CSD - SilverCareaga4/26/2010 Manhole Top of casing (steel) 30.4811.4419.0432S/13E-31H12Oceano CSD - SilverCareaga1/27/2010 Manhole Top of casing (steel) 30.489.4321.0532S/13E-31H12Oceano CSD - SilverCareaga 10/20/2009 Manhole Top of casing (steel) 30.482.9627.5232S/13E-31H12Oceano CSD - SilverCareaga8/19/2009 Manhole Top of casing (steel) 30.481.1429.3432S/13E-31H12Oceano CSD - SilverCareaga4/7/2009 Manhole Top of casing (steel) 30.48-0.8431.3232S/13E-31H12Oceano CSD - SilverCareaga 10/15/2008 Manhole Top of casing (steel) 30.48-11.1441.6232S/13E-31H12Oceano CSD - SilverCareaga4/16/2008 Manhole Top of casing (steel) 30.480.7829.7032S/13E-31H12Oceano CSD - SilverCareaga 10/19/2007 Manhole Top of casing (steel) 30.48-2.6733.1532S/13E-31H12Oceano CSD - SilverCareaga4/18/2007 Manhole Top of casing (steel) 30.484.1826.3032S/13E-31H12Oceano CSD - SilverCareaga 10/16/2006 Manhole Top of casing (steel) 30.483.1827.3032S/13E-31H12Oceano CSD - SilverCareaga4/11/2006 Manhole Top of casing (steel) 30.487.7822.7032S/13E-31H12Oceano CSD - SilverCareaga 10/31/2005 Manhole Top of casing (steel) 30.480.3830.1032S/13E-31H12Oceano CSD - SilverCareaga10/5/2001 Manhole Top of casing (steel) 30.4812.3818.1032S/13E-31H12Oceano CSD - SilverCareaga4/25/2001 Manhole Top of casing (steel) 30.4814.5815.9032S/13E-31H12Oceano CSD - SilverCareaga10/4/2000 Manhole Top of casing (steel) 30.488.8821.6032S/13E-31H12Oceano CSD - SilverCareaga4/14/2000 Manhole Top of casing (steel) 30.4813.4817.0032S/13E-31H12Oceano CSD - SilverCareaga 10/27/1999 Manhole Top of casing (steel) 30.486.3824.1032S/13E-31H12Oceano CSD - SilverCareaga 10/21/1998 Manhole Top of casing (steel) 30.483.8826.6032S/13E-31H12Oceano CSD - SilverCareaga4/23/1998 Manhole Top of casing (steel) 30.4813.6816.8032S/13E-31H12Oceano CSD - SilverCareaga 10/22/1997 Manhole Top of casing (steel) 30.48-1.7232.2032S/13E-31H12Oceano CSD - SilverCareaga4/28/1997 Manhole Top of casing (steel) 30.48-3.0233.5032S/13E-31H12Oceano CSD - SilverCareaga4/16/1996 Manhole Top of casing (steel) 30.481.2829.2032S/13E-31H12Oceano CSD - SilverCareaga10/4/1995 Manhole Top of casing (steel) 30.48-4.4234.9032S/13E-31H12Oceano CSD - SilverCareaga4/7/1995 Manhole Top of casing (steel) 30.480.9829.5032S/13E-31H12Oceano CSD - SilverCareaga4/13/1994 Manhole Top of casing (steel) 30.48-4.8235.3032S/13E-31H12Oceano CSD - SilverCareaga10/5/1993 Manhole Top of casing (steel) 30.482.1828.3032S/13E-31H12Oceano CSD - SilverCareaga4/6/1993 Manhole Top of casing (steel) 30.4811.0119.4732S/13E-31H12Oceano CSD - SilverCareaga 10/14/1992 Manhole Top of casing (steel) 30.480.1430.3432S/13E-31H12Oceano CSD - SilverCareaga4/14/1992 Manhole Top of casing (steel) 30.485.2525.2332S/13E-31H12Oceano CSD - SilverCareaga10/7/1991 Manhole Top of casing (steel) 30.48-0.0230.5032S/13E-31H12Oceano CSD - SilverCareaga4/4/1991 Manhole Top of casing (steel) 30.487.3623.1232S/13E-31H12Oceano CSD - SilverCareaga10/4/1990 Manhole Top of casing (steel) 30.480.7829.7032S/13E-31H12Oceano CSD - SilverCareaga4/11/1990 Manhole Top of casing (steel) 30.48-13.5244.0032S/13E-31H12Oceano CSD - SilverCareaga10/4/1989 Manhole Top of casing (steel) 30.484.6825.8032S/13E-31H12Oceano CSD - SilverCareaga10/3/1984 Manhole Top of casing (steel) 30.483.6826.80P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 265 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)32S/13E-31H12Oceano CSD - SilverCareaga5/16/1983 Manhole Top of casing (steel) 30.4816.9813.50P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 266 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)32S/13E-31H13Oceano CSD - YellowCareaga7/11/2022 Stove Pipe Top of casing (steel) 30.521.9728.5532S/13E-31H13Oceano CSD - YellowCareaga4/5/2022 Stove Pipe Top of casing (steel) 30.526.8523.6732S/13E-31H13Oceano CSD - YellowCareaga1/4/2022 Stove Pipe Top of casing (steel) 30.528.6021.9232S/13E-31H13Oceano CSD - YellowCareaga10/5/2021 Stove Pipe Top of casing (steel) 30.52-2.4032.9232S/13E-31H13Oceano CSD - YellowCareaga7/13/2021 Stove Pipe Top of casing (steel) 30.520.8929.6332S/13E-31H13Oceano CSD - YellowCareaga4/6/2021 Stove Pipe Top of casing (steel) 30.529.5420.9832S/13E-31H13Oceano CSD - YellowCareaga1/6/2021 Stove Pipe Top of casing (steel) 30.529.6020.9232S/13E-31H13Oceano CSD - YellowCareaga10/7/2020 Stove Pipe Top of casing (steel) 30.526.5024.0232S/13E-31H13Oceano CSD - YellowCareaga7/6/2020 Stove Pipe Top of casing (steel) 30.529.9920.5332S/13E-31H13Oceano CSD - YellowCareaga4/7/2020 Stove Pipe Top of casing (steel) 30.5213.6016.9232S/13E-31H13Oceano CSD - YellowCareaga1/7/2020 Stove Pipe Top of casing (steel) 30.5212.0018.5232S/13E-31H13Oceano CSD - YellowCareaga10/9/2019 Stove Pipe Top of casing (steel) 30.528.2822.2432S/13E-31H13Oceano CSD - YellowCareaga7/9/2019 Stove Pipe Top of casing (steel) 30.5210.1620.3632S/13E-31H13Oceano CSD - YellowCareaga4/9/2019 Stove Pipe Top of casing (steel) 30.526.5823.9432S/13E-31H13Oceano CSD - YellowCareaga1/8/2019 Stove Pipe Top of casing (steel) 30.526.2824.2432S/13E-31H13Oceano CSD - YellowCareaga10/9/2018 Stove Pipe Top of casing (steel) 30.52-2.7533.2732S/13E-31H13Oceano CSD - YellowCareaga7/10/2018 Stove Pipe Top of casing (steel) 30.525.7324.7932S/13E-31H13Oceano CSD - YellowCareaga4/10/2018 Stove Pipe Top of casing (steel) 30.5211.0819.4432S/13E-31H13Oceano CSD - YellowCareaga1/10/2018 Stove Pipe Top of casing (steel) 30.5210.7819.7432S/13E-31H13Oceano CSD - YellowCareaga 10/10/2017 Stove Pipe Top of casing (steel) 30.526.6723.8532S/13E-31H13Oceano CSD - YellowCareaga7/11/2017 Stove Pipe Top of casing (steel) 30.5210.9519.5732S/13E-31H13Oceano CSD - YellowCareaga4/11/2017 Stove Pipe Top of casing (steel) 30.5213.4517.0732S/13E-31H13Oceano CSD - YellowCareaga1/10/2017 Stove Pipe Top of casing (steel) 30.529.8420.6832S/13E-31H13Oceano CSD - YellowCareaga 10/12/2016 Stove Pipe Top of casing (steel) 30.523.7226.8032S/13E-31H13Oceano CSD - YellowCareaga7/19/2016 Stove Pipe Top of casing (steel) 30.525.0525.4732S/13E-31H13Oceano CSD - YellowCareaga4/12/2016 Stove Pipe Top of casing (steel) 30.529.3821.1432S/13E-31H13Oceano CSD - YellowCareaga1/12/2016 Stove Pipe Top of casing (steel) 30.528.8621.6632S/13E-31H13Oceano CSD - YellowCareaga 10/13/2015 Stove Pipe Top of casing (steel) 30.522.3528.1732S/13E-31H13Oceano CSD - YellowCareaga7/14/2015 Stove Pipe Top of casing (steel) 30.522.0328.4932S/13E-31H13Oceano CSD - YellowCareaga4/14/2015 Stove Pipe Top of casing (steel) 30.524.2126.3132S/13E-31H13Oceano CSD - YellowCareaga1/13/2015 Stove Pipe Top of casing (steel) 30.528.3122.2132S/13E-31H13Oceano CSD - YellowCareaga 10/14/2014 Stove Pipe Top of casing (steel) 30.52-6.4937.0132S/13E-31H13Oceano CSD - YellowCareaga7/29/2014 Stove Pipe Top of casing (steel) 30.520.9129.6132S/13E-31H13Oceano CSD - YellowCareaga6/4/2014 Stove Pipe Top of casing (steel) 30.52-1.9232.4432S/13E-31H13Oceano CSD - YellowCareaga4/15/2014 Stove Pipe Top of casing (steel) 30.52-4.4334.9532S/13E-31H13Oceano CSD - YellowCareaga1/14/2014 Stove Pipe Top of casing (steel) 30.526.8323.6932S/13E-31H13Oceano CSD - YellowCareaga 10/14/2013 Stove Pipe Top of casing (steel) 30.523.8026.7232S/13E-31H13Oceano CSD - YellowCareaga7/9/2013 Stove Pipe Top of casing (steel) 30.524.2226.3032S/13E-31H13Oceano CSD - YellowCareaga4/10/2013 Stove Pipe Top of casing (steel) 30.528.5421.9832S/13E-31H13Oceano CSD - YellowCareaga1/14/2013 Stove Pipe Top of casing (steel) 30.5211.3819.1432S/13E-31H13Oceano CSD - YellowCareaga 10/30/2012 Stove Pipe Top of casing (steel) 30.527.4023.1232S/13E-31H13Oceano CSD - YellowCareaga7/25/2012 Stove Pipe Top of casing (steel) 30.526.9423.5832S/13E-31H13Oceano CSD - YellowCareaga4/18/2012 Stove Pipe Top of casing (steel) 30.5214.5815.9432S/13E-31H13Oceano CSD - YellowCareaga1/12/2012 Stove Pipe Top of casing (steel) 30.5211.5518.9732S/13E-31H13Oceano CSD - YellowCareaga 11/21/2011 Stove Pipe Top of casing (steel) 30.5211.6518.87P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 267 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)32S/13E-31H13Oceano CSD - YellowCareaga7/26/2011 Stove Pipe Top of casing (steel) 30.527.9022.6232S/13E-31H13Oceano CSD - YellowCareaga4/20/2011 Stove Pipe Top of casing (steel) 30.5213.3317.1932S/13E-31H13Oceano CSD - YellowCareaga1/24/2011 Stove Pipe Top of casing (steel) 30.5212.6217.9032S/13E-31H13Oceano CSD - YellowCareaga 10/21/2010 Stove Pipe Top of casing (steel) 30.522.3028.2232S/13E-31H13Oceano CSD - YellowCareaga7/26/2010 Stove Pipe Top of casing (steel) 30.525.0225.5032S/13E-31H13Oceano CSD - YellowCareaga4/26/2010 Stove Pipe Top of casing (steel) 30.5211.3519.1732S/13E-31H13Oceano CSD - YellowCareaga1/27/2010 Stove Pipe Top of casing (steel) 30.529.9420.5832S/13E-31H13Oceano CSD - YellowCareaga 10/20/2009 Stove Pipe Top of casing (steel) 30.524.7225.8032S/13E-31H13Oceano CSD - YellowCareaga8/19/2009 Stove Pipe Top of casing (steel) 30.52-0.5231.0432S/13E-31H13Oceano CSD - YellowCareaga4/7/2009 Stove Pipe Top of casing (steel) 30.52-4.2634.7832S/13E-31H13Oceano CSD - YellowCareaga 10/15/2008 Stove Pipe Top of casing (steel) 30.52-7.2037.7232S/13E-31H13Oceano CSD - YellowCareaga4/16/2008 Stove Pipe Top of casing (steel) 30.520.7229.8032S/13E-31H13Oceano CSD - YellowCareaga 10/19/2007 Stove Pipe Top of casing (steel) 30.52-3.4333.9532S/13E-31H13Oceano CSD - YellowCareaga4/18/2007 Stove Pipe Top of casing (steel) 30.523.0227.5032S/13E-31H13Oceano CSD - YellowCareaga 10/16/2006 Stove Pipe Top of casing (steel) 30.523.0227.5032S/13E-31H13Oceano CSD - YellowCareaga4/11/2006 Stove Pipe Top of casing (steel) 30.523.6726.8532S/13E-31H13Oceano CSD - YellowCareaga 10/31/2005 Stove Pipe Top of casing (steel) 30.522.4728.0532S/13E-31H13Oceano CSD - YellowCareaga10/5/2001 Stove Pipe Top of casing (steel) 30.527.7222.8032S/13E-31H13Oceano CSD - YellowCareaga4/25/2001 Stove Pipe Top of casing (steel) 30.527.9222.6032S/13E-31H13Oceano CSD - YellowCareaga10/4/2000 Stove Pipe Top of casing (steel) 30.524.0226.5032S/13E-31H13Oceano CSD - YellowCareaga 10/27/1999 Stove Pipe Top of casing (steel) 30.52-4.2834.8032S/13E-31H13Oceano CSD - YellowCareaga 10/21/1998 Stove Pipe Top of casing (steel) 30.525.7224.8032S/13E-31H13Oceano CSD - YellowCareaga4/23/1998 Stove Pipe Top of casing (steel) 30.528.9221.6032S/13E-31H13Oceano CSD - YellowCareaga 10/22/1997 Stove Pipe Top of casing (steel) 30.520.3230.2032S/13E-31H13Oceano CSD - YellowCareaga4/28/1997 Stove Pipe Top of casing (steel) 30.524.9225.6032S/13E-31H13Oceano CSD - YellowCareaga4/16/1996 Stove Pipe Top of casing (steel) 30.526.7223.8032S/13E-31H13Oceano CSD - YellowCareaga10/4/1995 Stove Pipe Top of casing (steel) 30.524.6225.9032S/13E-31H13Oceano CSD - YellowCareaga4/7/1995 Stove Pipe Top of casing (steel) 30.528.1222.4032S/13E-31H13Oceano CSD - YellowCareaga4/13/1994 Stove Pipe Top of casing (steel) 30.524.0226.5032S/13E-31H13Oceano CSD - YellowCareaga10/5/1993 Stove Pipe Top of casing (steel) 30.52-0.5831.1032S/13E-31H13Oceano CSD - YellowCareaga4/6/1993 Stove Pipe Top of casing (steel) 30.523.6226.9032S/13E-31H13Oceano CSD - YellowCareaga 10/14/1992 Stove Pipe Top of casing (steel) 30.52-3.5334.0532S/13E-31H13Oceano CSD - YellowCareaga4/14/1992 Stove Pipe Top of casing (steel) 30.525.6224.9032S/13E-31H13Oceano CSD - YellowCareaga10/7/1991 Stove Pipe Top of casing (steel) 30.52-0.6831.2032S/13E-31H13Oceano CSD - YellowCareaga4/4/1991 Stove Pipe Top of casing (steel) 30.525.9224.6032S/13E-31H13Oceano CSD - YellowCareaga10/4/1990 Stove Pipe Top of casing (steel) 30.52-3.6834.2032S/13E-31H13Oceano CSD - YellowCareaga4/11/1990 Stove Pipe Top of casing (steel) 30.524.4226.1032S/13E-31H13Oceano CSD - YellowCareaga10/4/1989 Stove Pipe Top of casing (steel) 30.520.1230.4032S/13E-31H13Oceano CSD - YellowCareaga10/3/1984 Stove Pipe Top of casing (steel) 30.523.9226.6032S/13E-31H13Oceano CSD - YellowCareaga5/16/1983 Stove Pipe Top of casing (steel) 30.5216.2214.30P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 268 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)12N/36W-36L01Oceano Dunes - PasoPaso Robles 10/10/2023 Stove Pipe Top of PVC Casing 26.237.4618.7712N/36W-36L01Oceano Dunes - PasoPaso Robles 7/4/2023 Stove Pipe Top of PVC Casing 26.236.1920.0412N/36W-36L01Oceano Dunes - PasoPaso Robles 4/11/2023 Stove Pipe Top of PVC Casing 26.237.2718.9612N/36W-36L01Oceano Dunes - PasoPaso Robles 2/7/2023 Stove Pipe Top of PVC Casing 26.238.4117.8212N/36W-36L01Oceano Dunes - PasoPaso Robles 10/3/2022 Stove Pipe Top of PVC Casing 26.235.2820.9512N/36W-36L01Oceano Dunes - PasoPaso Robles 7/11/2022 Stove Pipe Top of PVC Casing 26.234.7521.4812N/36W-36L01Oceano Dunes - PasoPaso Robles 4/5/2022 Stove Pipe Top of PVC Casing 26.235.5020.7312N/36W-36L01Oceano Dunes - PasoPaso Robles 1/4/2022 Stove Pipe Top of PVC Casing 26.237.8318.4012N/36W-36L01Oceano Dunes - PasoPaso Robles 10/5/2021 Stove Pipe Top of PVC Casing 26.235.4920.7412N/36W-36L01Oceano Dunes - PasoPaso Robles 7/13/2021 Stove Pipe Top of PVC Casing 26.234.7021.5312N/36W-36L01Oceano Dunes - PasoPaso Robles 4/6/2021 Stove Pipe Top of PVC Casing 26.237.0319.2012N/36W-36L01Oceano Dunes - PasoPaso Robles 1/6/2021 Stove Pipe Top of PVC Casing 26.236.7319.5012N/36W-36L01Oceano Dunes - PasoPaso Robles 10/7/2020 Stove Pipe Top of PVC Casing 26.235.4720.7612N/36W-36L01Oceano Dunes - PasoPaso Robles 4/7/2020 Stove Pipe Top of PVC Casing 26.238.4217.8112N/36W-36L01Oceano Dunes - PasoPaso Robles 1/7/2020 Stove Pipe Top of PVC Casing 26.237.7518.4812N/36W-36L01Oceano Dunes - PasoPaso Robles 10/9/2019 Stove Pipe Top of PVC Casing 26.235.9220.3112N/36W-36L01Oceano Dunes - PasoPaso Robles 7/9/2019 Stove Pipe Top of PVC Casing 26.236.3819.8512N/36W-36L01Oceano Dunes - PasoPaso Robles 4/9/2019 Stove Pipe Top of PVC Casing 26.236.8419.3912N/36W-36L01Oceano Dunes - PasoPaso Robles 1/8/2019 Stove Pipe Top of PVC Casing 26.237.7718.4612N/36W-36L01Oceano Dunes - PasoPaso Robles 10/9/2018 Stove Pipe Top of PVC Casing 26.235.9720.2612N/36W-36L01Oceano Dunes - PasoPaso Robles 7/10/2018 Stove Pipe Top of PVC Casing 26.236.0320.2012N/36W-36L01Oceano Dunes - PasoPaso Robles 4/10/2018 Stove Pipe Top of PVC Casing 26.237.6618.5712N/36W-36L01Oceano Dunes - PasoPaso Robles 1/10/2018 Stove Pipe Top of PVC Casing 26.237.4518.7812N/36W-36L01Oceano Dunes - PasoPaso Robles 10/10/2017 Stove Pipe Top of PVC Casing 26.235.5420.6912N/36W-36L01Oceano Dunes - PasoPaso Robles 7/11/2017 Stove Pipe Top of PVC Casing 26.235.1821.0512N/36W-36L01Oceano Dunes - PasoPaso Robles 4/11/2017 Stove Pipe Top of PVC Casing 26.237.3918.8412N/36W-36L01Oceano Dunes - PasoPaso Robles 1/10/2017 Stove Pipe Top of PVC Casing 26.237.0719.1612N/36W-36L01Oceano Dunes - PasoPaso Robles 10/12/2016 Stove Pipe Top of PVC Casing 26.234.9121.3212N/36W-36L01Oceano Dunes - PasoPaso Robles 7/19/2016 Stove Pipe Top of PVC Casing 26.234.5621.6712N/36W-36L01Oceano Dunes - PasoPaso Robles 4/12/2016 Stove Pipe Top of PVC Casing 26.236.2120.0212N/36W-36L01Oceano Dunes - PasoPaso Robles 1/12/2016 Stove Pipe Top of PVC Casing 26.238.0118.2212N/36W-36L01Oceano Dunes - PasoPaso Robles 10/13/2015 Stove Pipe Top of PVC Casing 26.234.6321.6012N/36W-36L01Oceano Dunes - PasoPaso Robles 7/14/2015 Stove Pipe Top of PVC Casing 26.234.9321.3012N/36W-36L01Oceano Dunes - PasoPaso Robles 4/14/2015 Stove Pipe Top of PVC Casing 26.235.5920.6412N/36W-36L01Oceano Dunes - PasoPaso Robles 1/13/2015 Stove Pipe Top of PVC Casing 26.236.8819.3512N/36W-36L01Oceano Dunes - PasoPaso Robles 10/14/2014 Stove Pipe Top of PVC Casing 26.235.0221.2112N/36W-36L01Oceano Dunes - PasoPaso Robles 7/29/2014 Stove Pipe Top of PVC Casing 26.235.2021.0312N/36W-36L01Oceano Dunes - PasoPaso Robles 6/4/2014 Stove Pipe Top of PVC Casing 26.234.4121.8212N/36W-36L01Oceano Dunes - PasoPaso Robles 4/15/2014 Stove Pipe Top of PVC Casing 26.236.8819.3512N/36W-36L01Oceano Dunes - PasoPaso Robles 1/14/2014 Stove Pipe Top of PVC Casing 26.236.3919.8412N/36W-36L01Oceano Dunes - PasoPaso Robles 10/14/2013 Stove Pipe Top of PVC Casing 26.235.0621.1712N/36W-36L01Oceano Dunes - PasoPaso Robles 7/9/2013 Stove Pipe Top of PVC Casing 26.235.4020.8312N/36W-36L01Oceano Dunes - PasoPaso Robles 4/10/2013 Stove Pipe Top of PVC Casing 26.236.6719.5612N/36W-36L01Oceano Dunes - PasoPaso Robles 1/14/2013 Stove Pipe Top of PVC Casing 26.238.1518.0812N/36W-36L01Oceano Dunes - PasoPaso Robles 10/31/2012 Stove Pipe Top of PVC Casing 26.236.6619.57P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 269 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)12N/36W-36L01Oceano Dunes - PasoPaso Robles 7/24/2012 Stove Pipe Top of PVC Casing 26.237.3518.8812N/36W-36L01Oceano Dunes - PasoPaso Robles 4/20/2012 Stove Pipe Top of PVC Casing 26.238.5117.7212N/36W-36L01Oceano Dunes - PasoPaso Robles 4/18/2012 Stove Pipe Top of PVC Casing 26.232.9423.2912N/36W-36L01Oceano Dunes - PasoPaso Robles 1/11/2012 Stove Pipe Top of PVC Casing 26.239.0917.1412N/36W-36L01Oceano Dunes - PasoPaso Robles 11/21/2011 Stove Pipe Top of PVC Casing 26.238.6917.5412N/36W-36L01Oceano Dunes - PasoPaso Robles 7/26/2011 Stove Pipe Top of PVC Casing 26.237.1419.0912N/36W-36L01Oceano Dunes - PasoPaso Robles 4/20/2011 Stove Pipe Top of PVC Casing 26.238.5117.7212N/36W-36L01Oceano Dunes - PasoPaso Robles 1/24/2011 Stove Pipe Top of PVC Casing 26.239.1617.0712N/36W-36L01Oceano Dunes - PasoPaso Robles 10/21/2010 Stove Pipe Top of PVC Casing 26.236.0220.2112N/36W-36L01Oceano Dunes - PasoPaso Robles 7/27/2010 Stove Pipe Top of PVC Casing 26.235.5920.6412N/36W-36L01Oceano Dunes - PasoPaso Robles 4/26/2010 Stove Pipe Top of PVC Casing 26.238.0418.1912N/36W-36L01Oceano Dunes - PasoPaso Robles 10/21/2009 Stove Pipe Top of PVC Casing 26.236.2619.9712N/36W-36L01Oceano Dunes - PasoPaso Robles 8/20/2009 Stove Pipe Top of PVC Casing 26.234.8221.4112N/36W-36L01Oceano Dunes - PasoPaso Robles 5/11/2009 Stove Pipe Top of PVC Casing 26.236.3019.9312N/36W-36L01Oceano Dunes - PasoPaso Robles 4/18/2009 Stove Pipe Top of PVC Casing 26.238.0318.2012N/36W-36L01Oceano Dunes - PasoPaso Robles 10/23/2008 Stove Pipe Top of PVC Casing 26.235.2321.0012N/36W-36L01Oceano Dunes - PasoPaso Robles 4/23/2008 Stove Pipe Top of PVC Casing 26.237.1119.1212N/36W-36L01Oceano Dunes - PasoPaso Robles 10/18/2007 Stove Pipe Top of PVC Casing 26.236.1820.0512N/36W-36L01Oceano Dunes - PasoPaso Robles 4/18/2007 Stove Pipe Top of PVC Casing 26.237.5318.7012N/36W-36L01Oceano Dunes - PasoPaso Robles 10/12/2006 Stove Pipe Top of PVC Casing 26.237.5418.6912N/36W-36L01Oceano Dunes - PasoPaso Robles 4/20/2006 Stove Pipe Top of PVC Casing 26.238.5817.6512N/36W-36L01Oceano Dunes - PasoPaso Robles 10/28/2005 Stove Pipe Top of PVC Casing 26.237.4218.8112N/36W-36L01Oceano Dunes - PasoPaso Robles 4/29/2005 Stove Pipe Top of PVC Casing 26.237.3818.8512N/36W-36L01Oceano Dunes - PasoPaso Robles 10/15/2004 Stove Pipe Top of PVC Casing 26.236.9819.2512N/36W-36L01Oceano Dunes - PasoPaso Robles 4/29/2004 Stove Pipe Top of PVC Casing 26.238.9817.2512N/36W-36L01Oceano Dunes - PasoPaso Robles 10/28/2003 Stove Pipe Top of PVC Casing 26.238.5517.6812N/36W-36L01Oceano Dunes - PasoPaso Robles 10/17/2002 Stove Pipe Top of PVC Casing 26.236.7819.4512N/36W-36L01Oceano Dunes - PasoPaso Robles 4/18/2002 Stove Pipe Top of PVC Casing 26.236.8819.3512N/36W-36L01Oceano Dunes - PasoPaso Robles 10/5/2001 Stove Pipe Top of PVC Casing 26.238.2817.9512N/36W-36L01Oceano Dunes - PasoPaso Robles 4/24/2001 Stove Pipe Top of PVC Casing 26.239.3816.8512N/36W-36L01Oceano Dunes - PasoPaso Robles 10/13/2000 Stove Pipe Top of PVC Casing 26.238.4817.7512N/36W-36L01Oceano Dunes - PasoPaso Robles 4/28/2000 Stove Pipe Top of PVC Casing 26.238.5817.6512N/36W-36L01Oceano Dunes - PasoPaso Robles 10/29/1998 Stove Pipe Top of PVC Casing 26.237.6618.5712N/36W-36L01Oceano Dunes - PasoPaso Robles 10/26/1996 Stove Pipe Top of PVC Casing 26.235.8820.3512N/36W-36L01Oceano Dunes - PasoPaso Robles 10/24/1996 Stove Pipe Top of PVC Casing 26.236.5819.6512N/36W-36L01Oceano Dunes - PasoPaso Robles 4/19/1995 Stove Pipe Top of PVC Casing 26.238.5317.7012N/36W-36L01Oceano Dunes - PasoPaso Robles 11/1/1994 Stove Pipe Top of PVC Casing 26.235.5820.6512N/36W-36L01Oceano Dunes - PasoPaso Robles 4/11/1994 Stove Pipe Top of PVC Casing 26.237.3818.8512N/36W-36L01Oceano Dunes - PasoPaso Robles 10/20/1993 Stove Pipe Top of PVC Casing 26.236.4319.8012N/36W-36L01Oceano Dunes - PasoPaso Robles 5/3/1993 Stove Pipe Top of PVC Casing 26.236.9819.2512N/36W-36L01Oceano Dunes - PasoPaso Robles 4/20/1993 Stove Pipe Top of PVC Casing 26.237.6818.5512N/36W-36L01Oceano Dunes - PasoPaso Robles 11/4/1992 Stove Pipe Top of PVC Casing 26.236.0320.2012N/36W-36L01Oceano Dunes - PasoPaso Robles 4/30/1992 Stove Pipe Top of PVC Casing 26.237.1819.0512N/36W-36L01Oceano Dunes - PasoPaso Robles 10/11/1991 Stove Pipe Top of PVC Casing 26.236.4419.7912N/36W-36L01Oceano Dunes - PasoPaso Robles 4/19/1991 Stove Pipe Top of PVC Casing 26.236.2020.03P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 270 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)12N/36W-36L01Oceano Dunes - PasoPaso Robles 10/11/1990 Stove Pipe Top of PVC Casing 26.235.0721.1612N/36W-36L01Oceano Dunes - PasoPaso Robles 4/24/1990 Stove Pipe Top of PVC Casing 26.236.6019.6312N/36W-36L01Oceano Dunes - PasoPaso Robles 10/12/1989 Stove Pipe Top of PVC Casing 26.236.2919.9412N/36W-36L01Oceano Dunes - PasoPaso Robles 4/20/1989 Stove Pipe Top of PVC Casing 26.236.9619.2712N/36W-36L01Oceano Dunes - PasoPaso Robles 10/25/1988 Stove Pipe Top of PVC Casing 26.236.7419.4912N/36W-36L01Oceano Dunes - PasoPaso Robles 4/21/1988 Stove Pipe Top of PVC Casing 26.236.5619.6712N/36W-36L01Oceano Dunes - PasoPaso Robles 10/19/1987 Stove Pipe Top of PVC Casing 26.237.1719.0612N/36W-36L01Oceano Dunes - PasoPaso Robles 8/5/1987 Stove Pipe Top of PVC Casing 26.235.9820.2512N/36W-36L01Oceano Dunes - PasoPaso Robles 4/13/1987 Stove Pipe Top of PVC Casing 26.238.5917.6412N/36W-36L01Oceano Dunes - PasoPaso Robles 10/31/1986 Stove Pipe Top of PVC Casing 26.237.8818.3512N/36W-36L01Oceano Dunes - PasoPaso Robles 4/27/1986 Stove Pipe Top of PVC Casing 26.237.3718.8612N/36W-36L01Oceano Dunes - PasoPaso Robles 4/4/1985 Stove Pipe Top of PVC Casing 26.238.0818.1512N/36W-36L01Oceano Dunes - PasoPaso Robles 10/24/1984 Stove Pipe Top of PVC Casing 26.237.1619.0712N/36W-36L01Oceano Dunes - PasoPaso Robles 5/4/1982 Stove Pipe Top of PVC Casing 26.239.1817.0512N/36W-36L01Oceano Dunes - PasoPaso Robles 10/19/1981 Stove Pipe Top of PVC Casing 26.237.2019.0312N/36W-36L01Oceano Dunes - PasoPaso Robles 4/21/1981 Stove Pipe Top of PVC Casing 26.238.9817.2512N/36W-36L01Oceano Dunes - PasoPaso Robles 10/20/1980 Stove Pipe Top of PVC Casing 26.236.8819.3512N/36W-36L01Oceano Dunes - PasoPaso Robles 10/10/1980 Stove Pipe Top of PVC Casing 26.236.8819.3512N/36W-36L01Oceano Dunes - PasoPaso Robles 12/11/1979 Stove Pipe Top of PVC Casing 26.237.4818.7512N/36W-36L01Oceano Dunes - PasoPaso Robles 11/13/1979 Stove Pipe Top of PVC Casing 26.237.5818.6512N/36W-36L01Oceano Dunes - PasoPaso Robles 4/16/1979 Stove Pipe Top of PVC Casing 26.238.7317.5012N/36W-36L01Oceano Dunes - PasoPaso Robles 12/4/1978 Stove Pipe Top of PVC Casing 26.239.1417.0912N/36W-36L01Oceano Dunes - PasoPaso Robles 5/4/1978 Stove Pipe Top of PVC Casing 26.238.8817.3512N/36W-36L01Oceano Dunes - PasoPaso Robles 11/7/1977 Stove Pipe Top of PVC Casing 26.235.9320.3012N/36W-36L01Oceano Dunes - PasoPaso Robles 5/17/1977 Stove Pipe Top of PVC Casing 26.236.7519.4812N/36W-36L01Oceano Dunes - PasoPaso Robles 6/8/1976 Stove Pipe Top of PVC Casing 26.234.8321.4012N/36W-36L01Oceano Dunes - PasoPaso Robles 1/14/1976 Stove Pipe Top of PVC Casing 26.237.1519.0812N/36W-36L01Oceano Dunes - PasoPaso Robles 1/8/1976 Stove Pipe Top of PVC Casing 26.2310.2815.9512N/36W-36L01Oceano Dunes - PasoPaso Robles 12/25/1975 Stove Pipe Top of PVC Casing 26.237.7818.4512N/36W-36L01Oceano Dunes - PasoPaso Robles 11/25/1975 Stove Pipe Top of PVC Casing 26.237.7818.45P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 271 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)12N/36W-36L02Oceano Dunes - CareagaCareaga 10/10/2023 Stove Pipe Top of PVC Casing 26.45.5120.8912N/36W-36L02Oceano Dunes - CareagaCareaga7/4/2023 Stove Pipe Top of PVC Casing 26.46.4819.9212N/36W-36L02Oceano Dunes - CareagaCareaga4/11/2023 Stove Pipe Top of PVC Casing 26.4012.6213.7812N/36W-36L02Oceano Dunes - CareagaCareaga2/7/2023 Stove Pipe Top of PVC Casing 26.4011.3015.1012N/36W-36L02Oceano Dunes - CareagaCareaga10/3/2022 Stove Pipe Top of PVC Casing 26.40-0.2326.6312N/36W-36L02Oceano Dunes - CareagaCareaga7/11/2022 Stove Pipe Top of PVC Casing 26.40-1.5927.9912N/36W-36L02Oceano Dunes - CareagaCareaga4/5/2022 Stove Pipe Top of PVC Casing 26.404.9321.4712N/36W-36L02Oceano Dunes - CareagaCareaga1/4/2022 Stove Pipe Top of PVC Casing 26.409.0717.3312N/36W-36L02Oceano Dunes - CareagaCareaga10/5/2021 Stove Pipe Top of PVC Casing 26.400.3526.0512N/36W-36L02Oceano Dunes - CareagaCareaga7/13/2021 Stove Pipe Top of PVC Casing 26.40-0.1826.5812N/36W-36L02Oceano Dunes - CareagaCareaga4/6/2021 Stove Pipe Top of PVC Casing 26.407.0919.3112N/36W-36L02Oceano Dunes - CareagaCareaga1/6/2021 Stove Pipe Top of PVC Casing 26.406.4819.9212N/36W-36L02Oceano Dunes - CareagaCareaga10/7/2020 Stove Pipe Top of PVC Casing 26.401.5024.9012N/36W-36L02Oceano Dunes - CareagaCareaga4/7/2020 Stove Pipe Top of PVC Casing 26.4011.8814.5212N/36W-36L02Oceano Dunes - CareagaCareaga1/7/2020 Stove Pipe Top of PVC Casing 26.4011.7114.6912N/36W-36L02Oceano Dunes - CareagaCareaga10/9/2019 Stove Pipe Top of PVC Casing 26.402.4523.9512N/36W-36L02Oceano Dunes - CareagaCareaga7/9/2019 Stove Pipe Top of PVC Casing 26.405.4720.9312N/36W-36L02Oceano Dunes - CareagaCareaga4/9/2019 Stove Pipe Top of PVC Casing 26.4011.0515.3512N/36W-36L02Oceano Dunes - CareagaCareaga1/8/2019 Stove Pipe Top of PVC Casing 26.409.3217.0812N/36W-36L02Oceano Dunes - CareagaCareaga10/9/2018 Stove Pipe Top of PVC Casing 26.401.6724.7312N/36W-36L02Oceano Dunes - CareagaCareaga7/10/2018 Stove Pipe Top of PVC Casing 26.402.6623.7412N/36W-36L02Oceano Dunes - CareagaCareaga4/10/2018 Stove Pipe Top of PVC Casing 26.4010.7515.6512N/36W-36L02Oceano Dunes - CareagaCareaga1/10/2018 Stove Pipe Top of PVC Casing 26.407.6618.7412N/36W-36L02Oceano Dunes - CareagaCareaga 10/10/2017 Stove Pipe Top of PVC Casing 26.402.0724.3312N/36W-36L02Oceano Dunes - CareagaCareaga7/11/2017 Stove Pipe Top of PVC Casing 26.403.1223.2812N/36W-36L02Oceano Dunes - CareagaCareaga4/10/2017 Stove Pipe Top of PVC Casing 26.4011.7714.6312N/36W-36L02Oceano Dunes - CareagaCareaga1/10/2017 Stove Pipe Top of PVC Casing 26.4010.6215.7812N/36W-36L02Oceano Dunes - CareagaCareaga 10/12/2016 Stove Pipe Top of PVC Casing 26.40-1.0927.4912N/36W-36L02Oceano Dunes - CareagaCareaga7/19/2016 Stove Pipe Top of PVC Casing 26.401.0125.3912N/36W-36L02Oceano Dunes - CareagaCareaga4/12/2016 Stove Pipe Top of PVC Casing 26.408.3418.0612N/36W-36L02Oceano Dunes - CareagaCareaga1/12/2016 Stove Pipe Top of PVC Casing 26.4010.5015.9012N/36W-36L02Oceano Dunes - CareagaCareaga 10/13/2015 Stove Pipe Top of PVC Casing 26.40-0.4026.8012N/36W-36L02Oceano Dunes - CareagaCareaga7/14/2015 Stove Pipe Top of PVC Casing 26.400.6625.7412N/36W-36L02Oceano Dunes - CareagaCareaga4/14/2015 Stove Pipe Top of PVC Casing 26.404.5321.8712N/36W-36L02Oceano Dunes - CareagaCareaga1/13/2015 Stove Pipe Top of PVC Casing 26.409.8616.5412N/36W-36L02Oceano Dunes - CareagaCareaga 10/14/2014 Stove Pipe Top of PVC Casing 26.400.4725.9312N/36W-36L02Oceano Dunes - CareagaCareaga7/29/2014 Stove Pipe Top of PVC Casing 26.401.1325.2712N/36W-36L02Oceano Dunes - CareagaCareaga6/4/2014 Stove Pipe Top of PVC Casing 26.401.5524.8512N/36W-36L02Oceano Dunes - CareagaCareaga4/15/2014 Stove Pipe Top of PVC Casing 26.409.8316.5712N/36W-36L02Oceano Dunes - CareagaCareaga1/14/2014 Stove Pipe Top of PVC Casing 26.408.0118.3912N/36W-36L02Oceano Dunes - CareagaCareaga 10/14/2013 Stove Pipe Top of PVC Casing 26.402.8323.5712N/36W-36L02Oceano Dunes - CareagaCareaga7/9/2013 Stove Pipe Top of PVC Casing 26.403.6222.7812N/36W-36L02Oceano Dunes - CareagaCareaga4/10/2013 Stove Pipe Top of PVC Casing 26.4011.4214.9812N/36W-36L02Oceano Dunes - CareagaCareaga1/14/2013 Stove Pipe Top of PVC Casing 26.4015.5310.8712N/36W-36L02Oceano Dunes - CareagaCareaga 10/31/2012 Stove Pipe Top of PVC Casing 26.407.9618.44P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 272 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)12N/36W-36L02Oceano Dunes - CareagaCareaga7/24/2012 Stove Pipe Top of PVC Casing 26.407.7218.6812N/36W-36L02Oceano Dunes - CareagaCareaga4/18/2012 Stove Pipe Top of PVC Casing 26.4015.9610.4412N/36W-36L02Oceano Dunes - CareagaCareaga1/11/2012 Stove Pipe Top of PVC Casing 26.4015.5910.8112N/36W-36L02Oceano Dunes - CareagaCareaga 11/21/2011 Stove Pipe Top of PVC Casing 26.4012.7813.6212N/36W-36L02Oceano Dunes - CareagaCareaga7/26/2011 Stove Pipe Top of PVC Casing 26.408.7417.6612N/36W-36L02Oceano Dunes - CareagaCareaga1/24/2011 Stove Pipe Top of PVC Casing 26.4017.409.0012N/36W-36L02Oceano Dunes - CareagaCareaga 10/21/2010 Stove Pipe Top of PVC Casing 26.407.0019.4012N/36W-36L02Oceano Dunes - CareagaCareaga7/27/2010 Stove Pipe Top of PVC Casing 26.406.2420.1612N/36W-36L02Oceano Dunes - CareagaCareaga4/26/2010 Stove Pipe Top of PVC Casing 26.4014.7411.6612N/36W-36L02Oceano Dunes - CareagaCareaga 10/21/2009 Stove Pipe Top of PVC Casing 26.406.3320.0712N/36W-36L02Oceano Dunes - CareagaCareaga8/20/2009 Stove Pipe Top of PVC Casing 26.404.8321.5712N/36W-36L02Oceano Dunes - CareagaCareaga5/11/2009 Stove Pipe Top of PVC Casing 26.409.6016.8012N/36W-36L02Oceano Dunes - CareagaCareaga 10/23/2008 Stove Pipe Top of PVC Casing 26.405.2521.1512N/36W-36L02Oceano Dunes - CareagaCareaga4/23/2008 Stove Pipe Top of PVC Casing 26.4012.4313.9712N/36W-36L02Oceano Dunes - CareagaCareaga 10/18/2007 Stove Pipe Top of PVC Casing 26.406.2820.1212N/36W-36L02Oceano Dunes - CareagaCareaga4/18/2007 Stove Pipe Top of PVC Casing 26.4013.6812.7212N/36W-36L02Oceano Dunes - CareagaCareaga 10/12/2006 Stove Pipe Top of PVC Casing 26.409.6216.7812N/36W-36L02Oceano Dunes - CareagaCareaga4/20/2006 Stove Pipe Top of PVC Casing 26.4020.575.8312N/36W-36L02Oceano Dunes - CareagaCareaga 10/28/2005 Stove Pipe Top of PVC Casing 26.409.8816.5212N/36W-36L02Oceano Dunes - CareagaCareaga4/29/2005 Stove Pipe Top of PVC Casing 26.4017.488.9212N/36W-36L02Oceano Dunes - CareagaCareaga 10/15/2004 Stove Pipe Top of PVC Casing 26.407.4118.9912N/36W-36L02Oceano Dunes - CareagaCareaga4/29/2004 Stove Pipe Top of PVC Casing 26.4020.186.2212N/36W-36L02Oceano Dunes - CareagaCareaga 10/28/2003 Stove Pipe Top of PVC Casing 26.4012.2514.1512N/36W-36L02Oceano Dunes - CareagaCareaga 10/17/2002 Stove Pipe Top of PVC Casing 26.4011.9814.4212N/36W-36L02Oceano Dunes - CareagaCareaga4/18/2002 Stove Pipe Top of PVC Casing 26.4018.188.2212N/36W-36L02Oceano Dunes - CareagaCareaga10/5/2001 Stove Pipe Top of PVC Casing 26.4014.1812.2212N/36W-36L02Oceano Dunes - CareagaCareaga4/24/2001 Stove Pipe Top of PVC Casing 26.4022.184.2212N/36W-36L02Oceano Dunes - CareagaCareaga 10/13/2000 Stove Pipe Top of PVC Casing 26.4014.9811.4212N/36W-36L02Oceano Dunes - CareagaCareaga4/28/2000 Stove Pipe Top of PVC Casing 26.4020.585.8212N/36W-36L02Oceano Dunes - CareagaCareaga4/23/1999 Stove Pipe Top of PVC Casing 26.4013.1813.2212N/36W-36L02Oceano Dunes - CareagaCareaga 10/29/1998 Stove Pipe Top of PVC Casing 26.4013.7912.6112N/36W-36L02Oceano Dunes - CareagaCareaga 10/24/1996 Stove Pipe Top of PVC Casing 26.4010.1816.2212N/36W-36L02Oceano Dunes - CareagaCareaga 10/26/1995 Stove Pipe Top of PVC Casing 26.409.4816.9212N/36W-36L02Oceano Dunes - CareagaCareaga4/19/1995 Stove Pipe Top of PVC Casing 26.4017.738.6712N/36W-36L02Oceano Dunes - CareagaCareaga11/1/1994 Stove Pipe Top of PVC Casing 26.408.4817.9212N/36W-36L02Oceano Dunes - CareagaCareaga4/11/1994 Stove Pipe Top of PVC Casing 26.4014.6011.8012N/36W-36L02Oceano Dunes - CareagaCareaga 10/20/1993 Stove Pipe Top of PVC Casing 26.407.8818.5212N/36W-36L02Oceano Dunes - CareagaCareaga5/3/1993 Stove Pipe Top of PVC Casing 26.4012.3814.0212N/36W-36L02Oceano Dunes - CareagaCareaga4/20/1993 Stove Pipe Top of PVC Casing 26.4014.4811.9212N/36W-36L02Oceano Dunes - CareagaCareaga11/4/1992 Stove Pipe Top of PVC Casing 26.407.0819.3212N/36W-36L02Oceano Dunes - CareagaCareaga4/30/1992 Stove Pipe Top of PVC Casing 26.4012.4813.9212N/36W-36L02Oceano Dunes - CareagaCareaga 10/11/1991 Stove Pipe Top of PVC Casing 26.407.1819.2212N/36W-36L02Oceano Dunes - CareagaCareaga4/16/1991 Stove Pipe Top of PVC Casing 26.4013.1513.2512N/36W-36L02Oceano Dunes - CareagaCareaga 10/11/1990 Stove Pipe Top of PVC Casing 26.406.9319.4712N/36W-36L02Oceano Dunes - CareagaCareaga4/24/1990 Stove Pipe Top of PVC Casing 26.4012.5913.81P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 273 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)12N/36W-36L02Oceano Dunes - CareagaCareaga 10/12/1989 Stove Pipe Top of PVC Casing 26.4010.4415.9612N/36W-36L02Oceano Dunes - CareagaCareaga4/20/1989 Stove Pipe Top of PVC Casing 26.4015.0811.3212N/36W-36L02Oceano Dunes - CareagaCareaga 10/25/1988 Stove Pipe Top of PVC Casing 26.4011.0015.4012N/36W-36L02Oceano Dunes - CareagaCareaga4/21/1988 Stove Pipe Top of PVC Casing 26.4015.5810.8212N/36W-36L02Oceano Dunes - CareagaCareaga 10/19/1987 Stove Pipe Top of PVC Casing 26.4012.5813.8212N/36W-36L02Oceano Dunes - CareagaCareaga8/5/1987 Stove Pipe Top of PVC Casing 26.4012.5813.8212N/36W-36L02Oceano Dunes - CareagaCareaga4/13/1987 Stove Pipe Top of PVC Casing 26.4020.745.6612N/36W-36L02Oceano Dunes - CareagaCareaga 10/31/1986 Stove Pipe Top of PVC Casing 26.4016.479.9312N/36W-36L02Oceano Dunes - CareagaCareaga4/27/1986 Stove Pipe Top of PVC Casing 26.4020.425.9812N/36W-36L02Oceano Dunes - CareagaCareaga4/4/1985 Stove Pipe Top of PVC Casing 26.4019.886.5212N/36W-36L02Oceano Dunes - CareagaCareaga 10/24/1984 Stove Pipe Top of PVC Casing 26.4015.6610.7412N/36W-36L02Oceano Dunes - CareagaCareaga5/4/1982 Stove Pipe Top of PVC Casing 26.4020.865.5412N/36W-36L02Oceano Dunes - CareagaCareaga 10/19/1981 Stove Pipe Top of PVC Casing 26.4012.2314.1712N/36W-36L02Oceano Dunes - CareagaCareaga4/21/1981 Stove Pipe Top of PVC Casing 26.4019.846.5612N/36W-36L02Oceano Dunes - CareagaCareaga 10/20/1980 Stove Pipe Top of PVC Casing 26.4013.5812.8212N/36W-36L02Oceano Dunes - CareagaCareaga 12/11/1979 Stove Pipe Top of PVC Casing 26.4014.6811.7212N/36W-36L02Oceano Dunes - CareagaCareaga 11/13/1979 Stove Pipe Top of PVC Casing 26.4013.9812.4212N/36W-36L02Oceano Dunes - CareagaCareaga4/16/1979 Stove Pipe Top of PVC Casing 26.4018.527.8812N/36W-36L02Oceano Dunes - CareagaCareaga12/4/1978 Stove Pipe Top of PVC Casing 26.4014.0812.3212N/36W-36L02Oceano Dunes - CareagaCareaga5/4/1978 Stove Pipe Top of PVC Casing 26.4017.149.2612N/36W-36L02Oceano Dunes - CareagaCareaga11/7/1977 Stove Pipe Top of PVC Casing 26.407.7818.6212N/36W-36L02Oceano Dunes - CareagaCareaga5/17/1977 Stove Pipe Top of PVC Casing 26.4010.6715.7312N/36W-36L02Oceano Dunes - CareagaCareaga6/8/1976 Stove Pipe Top of PVC Casing 26.4011.2315.1712N/36W-36L02Oceano Dunes - CareagaCareaga1/14/1976 Stove Pipe Top of PVC Casing 26.4016.959.4512N/36W-36L02Oceano Dunes - CareagaCareaga1/8/1976 Stove Pipe Top of PVC Casing 26.4017.488.9212N/36W-36L02Oceano Dunes - CareagaCareaga 11/25/1975 Stove Pipe Top of PVC Casing 26.4016.489.92P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 274 of 306
Appendix A: NCMA Sentry Wells Water Level DataWellCommon NameAquiferDateSurfaceCompletonRP DescriptionRP Elev.(feet NAVD 88)Groundwater Elevation (feet NAVD 88)Depth to Water (feet)12N/35W-32C03County MW #3Paso Robles 10/10/2023 Flush Top of PVC Casing 47.4811.6335.8512N/35W-32C03County MW #3Paso Robles 7/4/2023 Flush Top of PVC Casing 47.4812.4135.0712N/35W-32C03County MW #3Paso Robles 4/11/2023 Flush Top of PVC Casing 47.4818.8328.6512N/35W-32C03County MW #3Paso Robles 2/7/2023 Flush Top of PVC Casing 47.4814.4932.9912N/35W-32C03County MW #3Paso Robles 10/3/2022 Flush Top of PVC Casing 47.48-0.8748.3512N/35W-32C03County MW #3Paso Robles 7/11/2022 Flush Top of PVC Casing 47.48-1.1748.6512N/35W-32C03County MW #3Paso Robles 4/5/2022 Flush Top of PVC Casing 47.486.7740.9312N/35W-32C03County MW #3Paso Robles 1/4/2022 Flush Top of PVC Casing 47.4810.9036.8012N/35W-32C03County MW #3Paso Robles 10/5/2021 Flush Top of PVC Casing 47.481.4646.2412N/35W-32C03County MW #3Paso Robles 7/13/2021 Flush Top of PVC Casing 47.482.9544.7512N/35W-32C03County MW #3Paso Robles 4/6/2021 Flush Top of PVC Casing 47.488.8638.8412N/35W-32C03County MW #3Paso Robles 1/6/2021 Flush Top of PVC Casing 47.487.7839.9212N/35W-32C03County MW #3Paso Robles 10/7/2020 Flush Top of PVC Casing 47.484.6743.0312N/35W-32C03County MW #3Paso Robles 7/6/2020 Flush Top of PVC Casing 47.486.3941.3112N/35W-32C03County MW #3Paso Robles 4/7/2020 Flush Top of PVC Casing 47.4816.2231.4812N/35W-32C03County MW #3Paso Robles 1/7/2020 Flush Top of PVC Casing 47.4812.4135.2912N/35W-32C03County MW #3Paso Robles 10/9/2019 Flush Top of PVC Casing 47.485.2842.4212N/35W-32C03County MW #3Paso Robles 7/9/2019 Flush Top of PVC Casing 47.4810.5037.20P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Level.xlsx 1/22/2024Page 275 of 306
Appendix A: NCMA Sentry Wells Water Level DataWell DateTotal Dissolved SolidsChloride Sodium Potassium Calcium MagnesiumAlkalinity, Bicarbonate (as CaCO3)Sulfate Nitrite (as N)Total Kjeldahl NitrogenBoron Fluoride Iodide Manganese BromideAlkalinity, Total (as CaCO3)Alkalinity, Carbonate (as CaCO3)Alkalinity, Hydroxide (as CaCO3)Specific ConductanceIron32S/12E-24B01 10/11/2023 2600 1400 520 29 180 180 420 190 < 0.0991.8 0.12 < 0.21 0.16 1.3 4.7 420 < 3< 34800 2.1 32S/12E-24B01 4/12/2023 3400 1500 580 31 190 200 450 180 < 0.391.7 0.14 < 2.1 0.15 1.4 4.6 450 < 3< 35000 2.7 32S/12E-24B01 10/4/2022 3000 1300 550 30 190 200 410 160 < 0.012 0.14 < 0.25 0.1 1.4 3.4 410 < 8.2 < 8.2 4950 3.5 32S/12E-24B01 4/7/2022 2900 1300 470 26 160 160 410 180 < 0.052 0.13 < 0.25 0.1 1.1 5.1 410 < 8.2 < 8.2 4800 2.5 32S/12E-24B01 10/6/2021 2900 1400 580 33 200 200 410 190 < 0.051.9 0.14 < 0.25 0.083 J 1.4 4.6 410 < 8.2 < 8.2 4960 4 32S/12E-24B01 4/7/2021 2800 1300 470 25 170 180 410 170 < 0.012 0.12 0.13 J 0.096 J 1.3 4.2 410 < 8.2 < 8.2— 2.4 32S/12E-24B01 10/12/2020 3100 1400 520 28 180 180 420 210 < 0.012 0.12 0.3 J 0.11 1.3 3.8 420 < 8.2 < 8.2 4840 2 32S/12E-24B01 4/22/2020 2800 1300 510 27 170 170 400 190 < 0.012.1 0.13 < 0.05 0.12 1.3 3.9 400 < 8.2 < 8.2 4930 3.2 32S/12E-24B01 10/14/2019 3100 1300 540 29 180 180 410 180 < 0.011.9 0.15 0.15 J 0.012 J 1.3 3.7 410 < 8.2 < 8.2 4900 2.7 32S/12E-24B01 4/10/2019 2800 1400 520 35 180 190 430 200 < 0.012 0.15 < 0.075 0.11 1.4 4 430 < 8.2 < 8.2 5260 2.1 32S/12E-24B01 10/9/2018 2800 1400 600 35 180 190 410 190 < 0.012.4 0.15 < 0.06 0.11 1.4 2.8 410 < 8.2 < 8.2 5040 22 32S/12E-24B01 4/11/2018 3000 1400 560 33 170 180 430 200 < 0.012 0.15 < 0.06 0.11 1.4 5.1 430 < 8.2 < 8.2 5150 2.2 32S/12E-24B01 10/11/2017 3100 1400 590 36 180 190 430 190 < 0.012.3 0.17 0.13 J 0.11 1.4 0.64 J 430 < 8.2 < 8.2 5180 1.7 32S/12E-24B01 4/11/2017 3400 1400 680 41 190 210 420 190 < 0.012.4 0.16 0.17 J 0.11 1.6 4.7 420 < 8.2 < 8.2 5020 1.8 32S/12E-24B01 10/11/2016 3100 1400 700 44 210 220 450 190 0.021 J2.1 0.18 < 0.11 0.12 1.6 4.1 450 < 8.2 < 8.2 5120 1.3 32S/12E-24B01 4/12/2016 2800 1400 640 37 170 180 420 190 —2.2 0.16 < 0.055 0.081 1.3 4.8 420 < 8.2 < 8.2 5000 0.73 32S/12E-24B01 10/15/2015 3230 230 560 34 160 170 413 42 —2.2 0.14 < 0.1 0.091 1.1 0.68 413 < 10< 104880 0.54 32S/12E-24B01 4/15/2015 3010 1300 510 30 150 160 410 220 —2.9 0.15 < 0.5 0.023 0.98 3.4 410 < 10< 104760 0.72 32S/12E-24B01 1/14/2015 2980 1300 520 30 150 170 400 210 —2.2 0.14 < 0.5 < 0.021 0.98 2.9 400 < 10< 104640 0.52 32S/12E-24B01 10/14/2014 3160 1100 530 32 150 170 390 180 —2.2 0.16 < 0.5 < 0.01 1.1 < 0.5 390 < 10< 104780 0.67 32S/12E-24B01 7/30/2014 2950 1300 520 29 140 170 440 190 —1.9 0.11 < 0.5 0.03 1.1 2.6 440 < 10< 104830 0.62 32S/12E-24B01 4/16/2014 2880 1200 560 29 140 140 390 190 —2.2 0.13 < 0.5 0.03 0.92 2.9 390 < 10< 104790 0.72 32S/12E-24B01 1/15/2014 2870 1300 540 30 140 160 380 214 —2.4 0.17 < 0.5 < 0.01 0.97 3 380 < 10< 104800 0.71 32S/12E-24B01 10/15/2013 2860 1200 560 31 150 160 380 200 —2.2 0.13 < 0.5 < 0.01 1 3 380 < 10< 104810 0.75 32S/12E-24B01 7/9/2013 2960 1300 560 32 150 160 395 215 —2.4 0.16 < 0.5 < 0.01 1.1 2 395 < 10< 104850 0.81 32S/12E-24B01 4/10/2013 2920 1300 540 30 140 150 410 220 —1.9 0.16 < 0.1 < 0.01 1 3.5 410 < 10< 104830 0.67 32S/12E-24B01 1/14/2013 2630 1300 540 30 140 140 410 220 —2.7 0.15 < 0.1 < 0.01 0.96 2.8 410 < 10< 104790 0.72 32S/12E-24B01 10/29/2012 2950 1200 590 34 150 160 360 200 —2.4 0.18 < 0.5 < 0.01 1.1 11 360 < 10< 104750 0.78 32S/12E-24B01 7/23/2012 3010 1400 530 30 120 130 397 210 —2.1 0.15 < 0.1 0.041 0.86 3 397 < 10< 104720 1.4 32S/12E-24B01 4/18/2012 3000 1500 450 27 120 120 400 230 —2 0.13 0.13 < 0.01 0.89 3.12 400 < 10< 104660 0.6 32S/12E-24B01 1/11/2012 2750 1200 520 30 140 140 400 170 —4 0.18 0.1 0.033 0.94 3.2 400 < 10< 104560 0.55 32S/12E-24B01 11/21/2011 2740 1200 410 25 130 120 380 200 —2.3 0.13 < 0.6 0.053 0.9 2.73 380 < 10< 104470 0.7 32S/12E-24B01 7/25/2011 3690 1200 530 33 140 150 380 200.2 —1.8 0.14 < 0.1 0.053 0.91 3.281 380 < 5< 54900 0.73 32S/12E-24B01 4/20/2011 2810 1214 500 27 140 130 400 216 —1.7 0.24 0.18 0.067 0.95 3.3 400 < 2< 24430 ND32S/12E-24B01 1/24/2011 2380 1100 370 24 110 120 380 180 —1.8 0.16 < 0.3 0.63 0.68 2.8 380 < 2< 24020 0.89 32S/12E-24B01 10/28/2010 2330 960 390 25 140 140 350 160 —3.9 0.15 < 0.1 ND 0.75 2.6 350 < 10< 103860 1.3 32S/12E-24B01 7/27/2010 616 43 52.5 6.21 115 44.7 341 160 —2.9 0.063 < 0.1 0.11 0.274 0.18 341 < 1< 11000 9.34 32S/12E-24B01 4/27/2010 676 47 54.7 4.6 107 43.6 327 140 —0.98 0.0714 < 0.1 < 0.1 0.0458 0.18 327 < 1< 1990 4.06 32S/12E-24B01 1/27/2010 694 55 56.2 6.8 123 43.2 340 150 —1.7 0.12 < 0.1 0.33 0.875 0.19 340 < 1< 11000 16.6 32S/12E-24B01 10/19/2009 766 140 121 16.7 111 52.4 303 150 —2.8 0.0959 0.11 < 0.1 0.208 0.47 303 < 1< 11200 7.79 32S/12E-24B01 8/20/2009 705 94 86.8 11.7 116 35.6 286 150 —2.7 ND < 0.1 0.12 0.248 0.38 286 < 1< 11000 7.15 32S/12E-24B01 5/12/2009 695 100 82.1 13.2 108 45 288 150 —ND ND 0.11 ND 0.66 0.29 288 < 1< 11100 23.9 32S/12E-24B01 3/26/1996 1870 773 380 24 125 95 427 154 —ND 0.27 ND ND ND NDNDNDNDND ND32S/12E-24B01 6/9/1976 1706 667 400 16.2 94 95 474 159 —ND 0.12 0.5 ND ND NDNDNDNDND ND32S/12E-24B01 1/17/1966 1700 652 406 20 95 83 440 175 —ND 0.07 0.3 ND ND NDNDNDNDND NDP:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Quality.xlsx2/2/2024Page 276 of 306
Appendix A: NCMA Sentry Wells Water Level DataWell DateTotal Dissolved SolidsChloride Sodium Potassium Calcium MagnesiumAlkalinity, Bicarbonate (as CaCO3)Sulfate Nitrite (as N)Total Kjeldahl NitrogenBoron Fluoride Iodide Manganese BromideAlkalinity, Total (as CaCO3)Alkalinity, Carbonate (as CaCO3)Alkalinity, Hydroxide (as CaCO3)Specific ConductanceIron32S/12E-24B02 10/11/2023 680 30 43 3.5 110 33 320 160 < 0.02 < 0.41 0.049 J 0.09 J 0.032 0.18 0.11 320 < 3< 3910 0.54 32S/12E-24B02 7/5/2023 660 30 46 3.6 120 34 320 170 —< 0.41 < 0.046 0.087 J 0.026 0.19 0.11 320 < 3< 3930 0.53 32S/12E-24B02 4/12/2023 630 34 46 3.5 110 35 330 170 < 0.02 < 0.41 0.058 J 0.085 J 0.026 0.19 0.12 330 < 3< 3960 0.54 32S/12E-24B02 2/8/2023 610 35 42 3.3 100 31 300 170 < 0.02 < 0.41 0.046 J 0.092 J 0.034 0.16 0.13 300 < 3< 3920 0.44 32S/12E-24B02 10/4/2022 610 34 43 3.2 100 33 280 160 < 0.010.21 0.061 J < 0.025 0.01 J 0.15 0.092 J 280 < 4.1 < 4.1902 0.47 32S/12E-24B02 7/12/2022 620 34 46 3.6 120 36 290 170 < 0.010.22 0.11 0.046 J 0.015 J 0.18 < 0.07 290 < 4.1 < 4.1915 0.49 32S/12E-24B02 4/7/2022 600 31 37 2.8 90 28 310 170 < 0.050.27 0.068 J 0.04 J 0.014 J 0.12 0.078 J 310 < 4.1 < 4.1910 0.34 32S/12E-24B02 1/5/2022 640 31 40 3.1 100 33 310 160 < 0.050.21 0.072 J 0.044 J 0.014 J 0.16 0.11 J 310 < 4.1 < 4.1928 0.43 32S/12E-24B02 10/6/2021 630 32 44 3.3 110 32 280 160 < 0.050.22 0.1 0.048 J 0.012 J 0.17 0.12 J 280 < 4.1 < 4.1929 0.5 32S/12E-24B02 7/15/2021 560 30 44 3.3 110 34 320 160 < 0.050.4 0.042 J 0.043 J 0.014 J 0.17 0.096 J 320 < 4.1 < 4.1949 0.47 32S/12E-24B02 4/7/2021 630 29 42 3.2 100 35 320 160 < 0.010.24 0.064 J 0.062 0.0099 J 0.16 0.11 J 320 < 4.1 < 4.1— 0.45 32S/12E-24B02 1/7/2021 590 30 45 3.3 110 36 320 170 < 0.010.63 0.073 0.064 0.014 0.17 0.082 320 < 4.1 < 4.1922 0.54 32S/12E-24B02 10/12/2020 700 31 46 3.6 120 36 320 160 < 0.010.21 0.073 J 0.054 0.014 J 0.18 0.096 J 320 < 4.1 < 4.1936 0.48 32S/12E-24B02 7/7/2020 690 31 48 3.6 120 35 300 170 < 0.010.23 0.072 J 0.047 J 0.014 J 0.18 0.078 J 300 < 4.1 < 4.1945 0.49 32S/12E-24B02 4/22/2020 560 31 41 3.4 100 32 330 160 < 0.010.28 0.06 J 0.026 J 0.014 J 0.16 < 0.07 330 < 4.1 < 4.1960 0.49 32S/12E-24B02 1/15/2020 660 31 47 4 120 37 320 160 < 0.010.23 0.075 J 0.055 0.017 J 0.18 0.14 J 320 < 4.1 < 4.1900 0.63 32S/12E-24B02 10/14/2019 700 30 45 3.7 110 35 310 160 < 0.01 0.097 J 0.078 J 0.046 J 0.11 0.18 < 0.076 310 < 4.1 < 4.1931 0.62 32S/12E-24B02 7/10/2019 820 30 48 4.2 120 37 320 160 < 0.010.34 0.074 J 0.037 J 0.015 J 0.18 < 0.076 320 < 4.1 < 4.1931 0.62 32S/12E-24B02 4/10/2019 620 31 42 3.6 110 35 320 160 < 0.010.31 0.07 J 0.059 < 0.01 0.17 0.13 J 320 < 4.1 < 4.1941 0.59 32S/12E-24B02 1/8/2019 630 30 43 3.6 110 35 310 160 < 0.010.27 0.072 J 0.056 0.013 J 0.17 0.096 J 310 < 4.1 < 4.1938 0.59 32S/12E-24B02 10/9/2018 640 30 48 3.8 120 37 320 160 < 0.010.34 0.068 J 0.025 J 0.013 J 0.18 0.061 J 320 < 4.1 < 4.1952 0.62 32S/12E-24B02 7/12/2018 620 29 46 3.7 120 36 320 150 0.011 J0.3 0.072 J 0.042 J 0.013 J 0.17 0.11 320 < 4.1 < 4.1962 0.69 32S/12E-24B02 4/11/2018 660 31 45 3.5 110 35 320 160 < 0.010.28 0.069 J 0.05 0.011 J 0.17 0.1 320 < 4.1 < 4.1942 0.58 32S/12E-24B02 1/12/2018 570 30 53 3.8 120 38 320 160 < 0.010.32 0.071 J 0.068 0.015 J 0.18 0.11 320 < 4.1 < 4.1930 0.56 32S/12E-24B02 10/11/2017 670 31 45 3.7 120 38 330 160 < 0.010.41 0.077 J 0.045 J 0.014 J 0.18 0.1 330 < 4.1 < 4.1962 0.74 32S/12E-24B02 7/12/2017 760 31 48 4 130 39 310 160 < 0.01 0.18 J 0.072 J 0.04 J 0.015 J 0.2 0.12 310 < 4.1 < 4.1948 0.93 32S/12E-24B02 4/11/2017 630 34 46 3.7 120 35 310 170 < 0.010.31 0.062 J 0.093 0.017 J 0.17 0.12 310 < 4.1 < 4.1933 0.59 32S/12E-24B02 1/12/2017 660 34 47 3.7 120 36 320 170 < 0.010.26 0.069 J 0.031 J 0.023 J 0.2 0.097 J 320 < 4.1 < 4.1938 0.79 32S/12E-24B02 10/11/2016 660 35 48 4 120 39 320 170 0.017 J 0.26 0.069 J 0.038 J 0.023 J 0.18 0.12 320 < 4.1 < 4.1953 0.75 32S/12E-24B02 7/19/2016 660 36 50 3.9 120 38 320 160 —0.15 0.07 0.036 0.016 0.17 0.15 320 < 4.1 < 4.1947 0.67 32S/12E-24B02 4/12/2016 640 35 48 3.8 110 37 300 160 —0.38 0.064 0.045 0.011 0.17 0.13 300 < 4.1 < 4.1939 0.53 32S/12E-24B02 1/12/2016 570 38 48 3.8 110 36 290 170 —0.27 0.044 0.11 0.015 0.16 0.15 290 < 4.1 < 4.1951 0.48 32S/12E-24B02 10/15/2015 650 34 41 3.8 100 33 306 160 —< 1 0.054 < 0.1 0.014 0.18 < 0.1 306 < 10< 10950 0.72 32S/12E-24B02 7/15/2015 650 35 50 3 120 36 295 160 —< 1 0.069 < 0.1 0.01 0.16 < 0.1 295 < 10< 10950 0.69 32S/12E-24B02 4/15/2015 620 35 40 3.4 100 31 300 170 —< 1 0.066 < 0.1 0.01 0.14 < 0.1 300 < 10< 10900 0.45 32S/12E-24B02 1/14/2015 640 36 41 3.3 110 32 290 170 —< 1 0.062 < 0.1 < 0.01 0.14 < 0.1 290 < 10< 10900 0.48 32S/12E-24B02 10/14/2014 630 30 41 3.9 100 32 290 140 —< 1 0.065 < 0.1 < 0.01 0.15 < 0.1 290 < 10< 10940 0.44 32S/12E-24B02 7/29/2014 620 33 42 3.5 100 33 300 150 —< 1 < 0.1 < 0.1 < 0.01 0.14 < 0.1 300 < 10< 10940 0.37 32S/12E-24B02 4/16/2014 630 32 43 4.3 88 28 300 150 —< 1 0.067 < 0.1 < 0.01 0.12 < 0.1 300 < 10< 10940 0.32 32S/12E-24B02 1/15/2014 630 33 46 3.9 100 34 290 165 —< 1 < 0.05 < 0.1 < 0.01 0.14 < 0.1 290 < 10< 10940 0.37 32S/12E-24B02 10/15/2013 630 30 44 3.8 98 32 290 170 —< 1 < 0.05 < 0.1 < 0.01 0.13 < 0.1 290 < 10< 10920 0.39 32S/12E-24B02 7/9/2013 630 30 43 3.9 110 33 295 170 —< 1 0.076 < 0.1 < 0.01 0.14 < 0.1 295 < 10< 10940 0.6 32S/12E-24B02 4/10/2013 630 31 44 4 100 32 310 160 —< 1 0.08 < 0.1 < 0.01 0.13 < 0.1 310 < 10< 10940 0.41 32S/12E-24B02 1/14/2013 620 30 43 4 97 31 305 170 —< 1 0.079 < 0.1 < 0.01 0.12 < 0.1 305 < 10< 10950 0.72 32S/12E-24B02 10/29/2012 650 29 45 4.2 100 32 280 160 —< 1 0.074 0.14 < 0.01 0.13 < 0.1 280 < 10< 10950 0.56 32S/12E-24B02 7/23/2012 650 35 45 4.3 87 27 297 170 —< 1 < 0.1 < 0.1 < 0.01 0.12 < 0.1 297 < 10< 10950 0.43 32S/12E-24B02 4/18/2012 630 37 39 3.7 88 28 310 171 —< 1 < 0.1 0.16 < 0.01 0.099 < 0.2 310 < 10< 10950 0.26 32S/12E-24B02 1/11/2012 650 33 46 4.6 110 32 300 150 —1.3 < 0.1 0.21 < 0.02 0.13 0.034 300 < 10< 10950 1.7 32S/12E-24B02 11/21/2011 640 32 39 3.9 93 29 290 150 —< 1 0.064 < 0.1 < 0.01 0.096 < 0.1 290 < 10< 10930 0.32 32S/12E-24B02 7/25/2011 640 36 48 4.2 97 31 290 165.3 —< 1 < 0.1 < 0.1 < 0.01 0.096 < 0.1 290 < 5< 5950 0.88 32S/12E-24B02 4/20/2011 620 39 46 7.4 90 36 320 174 —< 1 0.17 0.14 0.014 < 0.005 < 0.1 320 < 2< 2950 ND32S/12E-24B02 1/24/2011 640 43 44 5.9 87 28 270 170 —< 1 0.11 < 0.1 0.14 0.085 < 0.1 270 < 2< 2940 1.3 32S/12E-24B02 10/28/2010 650 43 50 4.5 110 35 270 160 —< 1 0.12 < 0.1 ND 0.085 < 0.3 270 < 10< 10970 0.63 32S/12E-24B02 7/27/2010 598 42 48.9 4.29 111 40.5 318 160 —1.3 0.0609 < 0.1 0.11 0.106 0.15 318 < 1< 1980 2.84 P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Quality.xlsx2/2/2024Page 277 of 306
Appendix A: NCMA Sentry Wells Water Level DataWell DateTotal Dissolved SolidsChloride Sodium Potassium Calcium MagnesiumAlkalinity, Bicarbonate (as CaCO3)Sulfate Nitrite (as N)Total Kjeldahl NitrogenBoron Fluoride Iodide Manganese BromideAlkalinity, Total (as CaCO3)Alkalinity, Carbonate (as CaCO3)Alkalinity, Hydroxide (as CaCO3)Specific ConductanceIron32S/12E-24B02 4/27/2010 668 46 52.7 4.73 111 43.2 349 150 —1.3 0.0666 < 0.1 0.14 0.101 0.16 349 < 1< 1980 6.66 32S/12E-24B02 1/27/2010 622 45 58 5.39 115 32.2 270 160 —0.84 0.117 < 0.1 0.14 0.209 0.16 270 < 1< 1920 3.49 32S/12E-24B02 10/19/2009 600 49 59.1 5.12 112 30.1 281 160 —0.98 0.0776 0.14 < 0.1 0.163 0.19 281 < 1< 1870 1.14 32S/12E-24B02 8/20/2009 630 49 63.5 5.85 128 30.1 288 150 —0.98 ND < 0.1 < 0.1 0.203 0.2 288 < 1< 1920 3.22 32S/12E-24B02 5/12/2009 622 82 67.5 6.33 114 34.5 282 150 —ND ND 0.11 ND 0.252 0.24 282 < 1< 1990 6.76 32S/12E-24B02 3/26/1996 652 54 46 5 107 24 344 169 —ND 0.1 ND ND ND NDNDNDNDND ND32S/12E-24B02 6/9/1976 565 34 52 4 104 27 337 153 —ND 0.02 0.5 ND ND NDNDNDNDND ND32S/12E-24B02 1/17/1966 651 62 79 5 101 32 380 147 —ND 0.05 0.3 ND ND NDNDNDNDND NDP:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Quality.xlsx2/2/2024Page 278 of 306
Appendix A: NCMA Sentry Wells Water Level DataWell DateTotal Dissolved SolidsChloride Sodium Potassium Calcium MagnesiumAlkalinity, Bicarbonate (as CaCO3)Sulfate Nitrite (as N)Total Kjeldahl NitrogenBoron Fluoride Iodide Manganese BromideAlkalinity, Total (as CaCO3)Alkalinity, Carbonate (as CaCO3)Alkalinity, Hydroxide (as CaCO3)Specific ConductanceIron32S/12E-24B03 10/11/2023 720 50 51 3.9 110 40 340 160 < 0.02 < 0.41 < 0.046 0.047 J 0.042 0.01 0.2 340 < 3< 3980 0.18 32S/12E-24B03 7/5/2023 660 51 53 3.8 110 40 330 170 —< 0.41 0.047 J 0.047 J 0.035 0.011 0.2 330 < 3< 31000 0.2 32S/12E-24B03 4/12/2023 650 51 56 4.1 110 42 340 160 < 0.02 < 0.41 0.067 J 0.043 J 0.033 0.011 0.2 340 < 3< 31000 0.21 32S/12E-24B03 2/8/2023 640 51 51 3.8 110 40 340 160 < 0.02 < 0.41 0.052 J 0.05 J 0.039 0.013 0.2 340 < 3< 31000 0.23 32S/12E-24B03 10/4/2022 650 51 56 3.9 120 45 320 160 < 0.01 < 0.088 0.052 J < 0.025 0.018 J 0.01 0.14 J 320 < 8.2 < 8.2 1020 0.19 32S/12E-24B03 7/12/2022 640 53 50 3.7 110 40 320 170 < 0.010.1 J 0.087 J < 0.025 0.018 J 0.0099 J < 0.07 320 < 8.2 < 8.2 1020 0.16 32S/12E-24B03 4/7/2022 660 51 52 3.8 110 39 320 160 < 0.05< 0.2 0.069 J < 0.05 0.019 J 0.0097 J 0.13 J 320 < 4.1 < 4.1987 0.16 32S/12E-24B03 1/5/2022 670 52 52 3.9 110 41 320 170 < 0.05< 0.2 0.078 J < 0.05 0.019 J 0.01 0.17 J 320 < 8.2 < 8.2 1020 0.17 32S/12E-24B03 10/6/2021 660 53 56 3.6 120 43 320 160 < 0.05 0.16 J 0.092 J < 0.05 0.018 J 0.0098 J 0.16 J 320 < 8.2 < 8.2 1010 0.044 J32S/12E-24B03 7/15/2021 590 51 51 3.6 110 40 320 160 < 0.05 0.14 J 0.038 J < 0.05 0.02 J 0.0093 J 0.17 J 320 < 8.2 < 8.2 1020 0.19 32S/12E-24B03 4/7/2021 670 49 51 3.7 100 40 330 160 < 0.01 < 0.088 0.059 J 0.036 J 0.016 J 0.011 0.17 J 330 < 8.2 < 8.2— 0.18 32S/12E-24B03 1/7/2021 490 51 53 3.9 110 41 330 170 < 0.010.39 0.068 0.026 0.02 0.01 0.21 330 < 4.1 < 4.1992 0.17 32S/12E-24B03 10/12/2020 740 51 53 3.8 110 40 320 170 < 0.01 < 0.088 0.057 J 0.032 J 0.021 J 0.01 0.16 J 320 < 8.2 < 8.2 1010 0.29 32S/12E-24B03 7/7/2020 760 53 55 3.9 110 42 330 170 < 0.01 < 0.088 0.064 J < 0.025 0.021 J 0.01 0.22 330 < 8.2 < 8.2 1020 0.23 32S/12E-24B03 4/22/2020 570 50 50 3.7 110 39 330 160 < 0.01 0.12 J 0.055 J < 0.025 0.022 J 0.011 0.17 J 330 < 8.2 < 8.2 1040 0.29 32S/12E-24B03 1/15/2020 590 50 55 4 120 42 330 160 < 0.01 0.076 J 0.066 J < 0.024 0.025 J 0.01 0.13 J 330 < 4.1 < 4.1972 0.28 32S/12E-24B03 10/14/2019 660 48 56 4 120 40 330 170 < 0.01 0.11 J 0.068 J 0.029 J 0.018 J 0.011 0.18 J 330 < 8.2 < 8.2 1010 0.26 32S/12E-24B03 7/10/2019 890 49 53 4.2 110 44 330 160 < 0.01 0.15 J 0.065 J 0.02 J 0.018 J 0.01 0.18 J 330 < 8.2 < 8.2 1000 0.18 32S/12E-24B03 4/10/2019 640 50 50 3.7 110 43 320 160 < 0.01 0.15 J 0.063 J 0.037 J 0.017 J 0.012 0.16 J 320 < 8.2 < 8.2 1020 0.44 32S/12E-24B03 1/8/2019 660 50 50 3.9 110 43 320 160 < 0.01 0.12 J 0.065 J 0.039 J 0.021 J 0.011 0.14 320 < 8.2 < 8.2 1020 0.21 32S/12E-24B03 10/9/2018 690 48 52 4.1 110 45 320 160 < 0.01 0.19 J 0.065 J < 0.012 0.02 J 0.011 0.096 J 320 < 8.2 < 8.2 1030 0.19 32S/12E-24B03 7/12/2018 650 47 51 3.8 110 42 320 150 0.011 J 0.14 J 0.062 J 0.023 J 0.02 J 0.01 0.16 320 < 8.2 < 8.2 1040 0.18 32S/12E-24B03 4/11/2018 670 50 53 4 110 44 320 160 < 0.01 0.11 J 0.065 J 0.017 J 0.019 J 0.011 0.19 320 < 8.2 < 8.2 1010 0.19 32S/12E-24B03 1/12/2018 620 48 57 3.9 110 45 330 160 < 0.01 0.13 J 0.061 J 0.041 J 0.023 J 0.011 0.18 330 < 4.1 < 4.1993 0.19 32S/12E-24B03 10/11/2017 660 49 54 4 120 45 330 160 < 0.01 0.16 J 0.069 J 0.022 J 0.02 J 0.011 0.19 330 < 8.2 < 8.2 1020 0.2 32S/12E-24B03 7/12/2017 790 46 54 4 120 45 320 160 < 0.01 < 0.088 0.062 J 0.015 J 0.02 J 0.011 0.18 320 < 8.2 < 8.2 1010 0.19 32S/12E-24B03 4/11/2017 670 48 55 4.1 120 45 330 160 0.01 J 0.17 J 0.058 J < 0.012 0.019 J 0.012 0.21 330 < 4.1 < 4.1988 0.23 32S/12E-24B03 1/12/2017 670 47 58 4.3 130 50 340 160 < 0.01 < 0.088 0.068 J 0.012 J 0.024 J 0.014 0.18 340 < 8.2 < 8.2 1000 0.27 32S/12E-24B03 10/11/2016 680 49 53 4 110 47 340 160 0.019 J < 0.088 0.06 J 0.015 J 0.025 J 0.013 0.17 340 < 8.2 < 8.2 1020 0.22 32S/12E-24B03 7/19/2016 690 47 54 4.1 110 46 340 160 —0.32 0.063 0.017 0.016 0.013 0.2 340 < 8.2 < 8.2 1010 0.32 32S/12E-24B03 4/12/2016 680 48 55 4.1 110 45 320 160 —0.21 0.056 0.019 0.018 0.012 0.17 320 < 8.2 < 8.2 1010 0.28 32S/12E-24B03 1/12/2016 610 51 53 4 110 46 320 170 —0.11 0.037 0.038 < 0.1 0.015 0.19 320 < 8.2 < 8.2 1050 0.27 32S/12E-24B03 10/15/2015 650 44 48 4.4 100 42 325 160 —< 1 < 0.05 < 0.1 0.016 0.01 < 0.1 325 < 10< 101020 0.21 32S/12E-24B03 7/15/2015 680 46 60 40 120 47 333 160 —< 1 0.064 < 0.1 0.01 0.01 < 0.1 333 < 10< 101020 0.2 32S/12E-24B03 4/15/2015 650 46 44 3.5 96 38 330 170 —< 1 0.061 < 0.1 0.012 0.008 < 0.1 330 < 10< 10980 0.17 32S/12E-24B03 1/14/2015 670 47 48 3.6 110 43 330 170 —< 1 0.052 < 0.1 0.01 0.09 < 0.1 330 < 10< 10970 0.17 32S/12E-24B03 10/14/2014 650 40 48 4.1 100 41 330 142 —< 1 0.061 < 0.1 < 0.01 0.01 < 0.1 330 < 10< 101010 0.19 32S/12E-24B03 7/30/2014 650 45 45 3.1 94 40 390 150 —< 1 < 0.1 < 0.1 < 0.01 < 0.005 < 0.1 390 < 10< 101020 0.19 32S/12E-24B03 4/16/2014 660 43 46 4.3 90 35 330 150 —< 1 0.056 < 0.1 < 0.01 < 0.005 0.11 330 < 10< 101010 0.16 32S/12E-24B03 1/15/2014 660 45 52 4 100 41 320 165 —< 1 < 0.05 < 0.1 < 0.01 0.009 < 0.1 320 < 10< 101010 0.17 32S/12E-24B03 10/15/2013 720 40 51 4 100 40 310 170 —< 1 < 0.05 < 0.1 < 0.01 0.009 < 0.1 310 < 10< 101010 0.2 32S/12E-24B03 7/9/2013 660 46 47 3.9 110 41 310 170 —< 1 0.066 < 0.1 < 0.01 0.01 < 0.1 310 < 10< 101010 0.27 32S/12E-24B03 4/10/2013 670 44 46 3.8 96 38 320 160 —< 1 0.071 < 0.1 < 0.01 0.008 < 0.1 320 < 10< 101010 0.19 32S/12E-24B03 1/14/2013 630 45 47 3.9 96 37 320 170 —< 1 0.065 < 0.1 < 0.01 0.008 < 0.1 320 < 10< 101010 0.26 32S/12E-24B03 10/29/2012 680 45 49 4.1 100 39 305 158 —< 1 0.069 0.1 < 0.01 0.009 < 0.1 305 < 10< 101010 0.22 32S/12E-24B03 7/23/2012 670 49 47 4.1 86 35 318 170 —< 1 < 0.1 < 0.1 < 0.01 0.015 < 0.1 318 < 10< 101010 0.24 32S/12E-24B03 4/18/2012 640 50 40 3.4 84 33 320 160 —< 1 < 0.1 < 0.2 < 0.01 0.007 < 0.2 320 < 10< 101010 0.23 32S/12E-24B03 1/12/2012 660 46 48 3.2 92 36 300 150 —< 1 < 0.1 0.35 < 0.02 0.008 < 0.2 300 < 10< 101000 0.15 32S/12E-24B03 11/21/2011 660 43 41 3.7 91 34 310 150 —1.6 0.046 < 0.1 0.014 0.009 < 0.1 310 < 10< 10970 0.12 32S/12E-24B03 7/25/2011 650 46.3 50 6 98 38 310 159.6 —< 1 < 0.1 < 0.1 0.011 0.01 < 0.1 310 < 5< 51010 0.21 32S/12E-24B03 4/20/2011 650 47 48 4.6 95 31 310 168 —< 1 0.11 0.08 0.015 0.008 < 0.1 310 < 2< 21020 ND32S/12E-24B03 1/24/2011 660 46 44 5.6 87 33 320 160 —< 1 ND < 0.1 0.15 0.0096 < 0.1 320 < 2< 21020 0.22 32S/12E-24B03 10/28/2010 660 44 48 3.8 110 39 315 50 —< 1 0.089 < 0.1 ND 0.012 < 0.3 315 < 10< 101020 0.55 32S/12E-24B03 7/27/2010 610 44 51.4 8.34 112 41.6 328 160 —1.8 0.0533 < 0.1 0.17 0.0602 0.16 328 < 1< 11000 6.7 P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Quality.xlsx2/2/2024Page 279 of 306
Appendix A: NCMA Sentry Wells Water Level DataWell DateTotal Dissolved SolidsChloride Sodium Potassium Calcium MagnesiumAlkalinity, Bicarbonate (as CaCO3)Sulfate Nitrite (as N)Total Kjeldahl NitrogenBoron Fluoride Iodide Manganese BromideAlkalinity, Total (as CaCO3)Alkalinity, Carbonate (as CaCO3)Alkalinity, Hydroxide (as CaCO3)Specific ConductanceIron32S/12E-24B03 4/27/2010 666 45 53.2 4.84 118 44 357 150 —1.5 0.0636 < 0.1 0.1 0.0519 0.17 357 < 1< 1980 9.71 32S/12E-24B03 1/27/2010 672 48 56.4 5.4 119 43.4 336 150 —1.4 0.101 < 0.1 0.15 0.14 0.15 336 < 1< 11000 5.18 32S/12E-24B03 10/19/2009 622 40 55.1 3.93 110 42.6 342 160 —< 0.5 0.0613 < 0.1 0.13 0.0181 0.14 342 < 1< 1880 0.343 32S/12E-24B03 8/19/2009 680 47 54.9 5.21 128 43.4 337 150 —2.2 ND < 0.1 0.66 0.182 0.15 337 < 1< 11000 14.3 32S/12E-24B03 5/12/2009 645 44 53.2 4.53 108 41.8 332 140 —ND ND < 0.1 ND 0.124 0.16 332 < 1< 11000 5.9 32S/12E-24B03 3/26/1996 646 41 52 4.3 104 42 412 164 —ND 0.12 ND ND ND NDNDNDNDND ND32S/12E-24B03 6/9/1976 569 36 53 3.7 85 39 330 165 —ND 0.06 0.4 ND ND NDNDNDNDND ND32S/12E-24B03 1/17/1966 670 79 74 5 103 36 345 158 —ND ND 0.2 ND ND NDNDNDNDND NDP:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Quality.xlsx2/2/2024Page 280 of 306
Appendix A: NCMA Sentry Wells Water Level DataWell DateTotal Dissolved SolidsChloride Sodium Potassium Calcium MagnesiumAlkalinity, Bicarbonate (as CaCO3)Sulfate Nitrite (as N)Total Kjeldahl NitrogenBoron Fluoride Iodide Manganese BromideAlkalinity, Total (as CaCO3)Alkalinity, Carbonate (as CaCO3)Alkalinity, Hydroxide (as CaCO3)Specific ConductanceIron32S/13E-30F01 10/11/2023 490 64 65 2.1 42 19 82 120 < 0.02 < 0.41 0.056 J 0.083 J 0.0035 < 0.0045 0.31 82 < 3< 3680 < 0.01432S/13E-30F01 4/12/2023 490 67 77 2.1 45 21 96 120 < 0.02 < 0.41 0.088 J 0.079 J ND < 0.0045 0.35 96 < 3< 3740 < 0.01432S/13E-30F01 10/4/2022 560 71 77 2.2 48 23 97 120 < 0.01 0.12 J 0.098 J < 0.025 < 0.005 < 0.004 0.26 97 < 4.1 < 4.1777 < 0.0332S/13E-30F01 4/6/2022 500 80 69 2.1 48 22 95 130 < 0.050.1 J 0.085 J 0.037 J < 0.1 < 0.01 0.25 95 < 4.1 < 4.1806 < 0.0532S/13E-30F01 10/6/2021 450 67 71 1.9 47 21 81 120 < 0.05 0.19 J 0.12 0.056 < 0.1 < 0.01 0.26 81 < 4.1 < 4.1710 < 0.0532S/13E-30F01 4/7/2021 670 70 66 1.9 41 20 85 130 < 0.01 0.17 J 0.078 J 0.09 < 0.005 < 0.004 0.31 85 < 4.1 < 4.1— < 0.0332S/13E-30F01 10/12/2020 490 66 68 2 44 20 83 120 < 0.01 0.12 J 0.083 J 0.057 < 0.005 < 0.004 0.26 83 < 4.1 < 4.1700 < 0.0332S/13E-30F01 4/22/2020 500 64 68 2.1 44 19 84 120 < 0.01 0.15 J 0.081 J 0.033 J < 0.01 < 0.004 0.26 84 < 4.1 < 4.1719 0.043 J32S/13E-30F01 10/14/2019 460 62 69 2 43 18 82 120 < 0.01 0.11 J 0.092 J 0.046 J < 0.01 < 4 0.29 82 < 4.1 < 4.1696 0.061 32S/13E-30F01 4/10/2019 480 61 60 2.1 41 19 85 120 < 0.01 0.12 J 0.089 J 0.063 < 0.01 < 0.004 0.19 J 85 < 4.1 < 4.1693 0.035 J32S/13E-30F01 10/10/2018 460 62 72 2.3 44 21 84 120 < 0.01 0.085 J 0.089 J 0.034 J < 0.01 < 0.004 0.16 84 < 4.1 < 4.1696 < 0.0332S/13E-30F01 4/12/2018 470 58 69 2.3 44 21 82 110 < 0.01 0.14 J 0.092 J 0.03 J < 0.01 < 0.004 0.23 82 < 4.1 < 4.1699 < 0.0332S/13E-30F01 10/11/2017 500 68 67 2.2 46 23 97 120 < 0.01 0.18 J 0.093 J 0.045 J < 0.01 0.018 0.28 97 < 4.1 < 4.1752 0.061 32S/13E-30F01 4/12/2017 510 61 65 2.1 42 20 85 120 < 0.01 0.12 J 0.074 J 0.062 < 0.01 < 0.004 0.28 85 < 4.1 < 4.1682 0.045 J32S/13E-30F01 10/11/2016 480 62 72 2.3 46 23 91 120 0.019 J 0.13 J 0.09 J 0.046 J < 0.01 < 0.004 0.32 91 < 4.1 < 4.1702 < 0.0332S/13E-30F01 4/13/2016 460 60 70 2.3 43 21 90 120 —0.17 0.086 0.054 < 0.01 < 0.004 0.3 90 < 4.1 < 4.1696 < 0.0332S/13E-30F01 10/14/2015 450 58 61 2.1 39 19 87 120 —< 1 0.084 < 0.1 < 0.01 < 0.005 0.18 87 < 10< 10700 < 0.0532S/13E-30F01 4/15/2015 460 64 60 2 40 19 90 130 —< 1 0.081 < 0.1 < 0.01 < 0.005 0.202 90 < 10< 10700 < 0.0532S/13E-30F01 1/14/2015 550 95 69 2 50 24 98 140 —< 1 0.085 < 0.1 < 0.01 < 0.005 0.169 98 < 10< 10820 < 0.0532S/13E-30F01 10/14/2014 470 58 64 2.2 42 19 84 120 —< 1 0.081 < 0.1 < 0.01 < 0.005 0.172 84 < 10< 10730 < 0.0532S/13E-30F01 7/30/2014 540 89 71 2 46 24 94 130 —< 1 < 0.1 < 0.1 < 0.01 < 0.005 0.101 94 < 10< 10860 < 0.0532S/13E-30F01 4/16/2014 610 122 78 3.3 47 22 100 140 —< 1 0.1 < 0.1 < 0.01 < 0.005 0.17 100 < 10< 10970 < 0.0532S/13E-30F01 1/15/2014 510 80 69 2.3 45 22 94 136 —13 < 0.1 < 0.1 < 0.01 < 0.005 0.19 94 < 10< 10810 < 0.0532S/13E-30F01 10/15/2013 530 78 73 2.3 47 22 86 140 —< 1 0.072 < 0.1 < 0.01 < 0.005 0.17 86 < 10< 10830 < 0.0532S/13E-30F01 7/10/2013 480 80 64 2.2 49 22 85 140 —< 1 0.089 < 0.1 < 0.01 < 0.005 < 0.1 85 < 10< 10770 < 0.0532S/13E-30F01 4/11/2013 460 60 60 2.2 38 18 78 120 —< 1 0.091 < 0.1 < 0.01 < 0.005 0.2 78 < 10< 10710 < 0.0532S/13E-30F01 1/15/2013 440 65 64 2.4 40 19 95 130 —< 1 0.09 < 0.1 < 0.01 < 0.005 0.11 95 < 10< 10720 0.054 32S/13E-30F01 10/30/2012 470 60 66 2.5 43 20 75 123 —< 1 0.087 < 0.1 < 0.01 < 0.005 0.13 75 < 10< 10720 < 0.0532S/13E-30F01 7/24/2012 470 73 66 2.7 36 18 86 120 —< 1 < 0.1 < 0.1 < 0.01 0.019 0.11 86 < 10< 10720 < 0.0532S/13E-30F01 4/19/2012 450 72 52 1.9 32 15 81 130 —< 1 < 0.1 < 0.2 < 0.01 < 0.005 < 0.2 81 < 10< 10700 < 0.132S/13E-30F01 1/10/2012 —— — — — ——— —— — — — — —81 ——— —32S/13E-30F01 1/9/2012 1050 260 170 34 68 52 307 200 < 0.012.7 0.21 0.41 < 0.01 0.088 1.9 307 < 10< 101760 2.9 32S/13E-30F01 11/17/2011 470 70 82 2.4 40 19 78 120 —< 1 < 0.1 < 0.1 < 0.01 < 0.005 0.16 78 < 10< 10720 < 0.132S/13E-30F01 7/25/2011 460 65.8 68 4.4 37 19 78 117.4 —< 1 0.1 0.101 < 0.01 0.014 0.178 78 < 5< 5720 0.11 32S/13E-30F01 4/20/2011 460 71 69 2.6 36 14 87 124 —< 1 0.18 0.11 < 0.01 < 0.005 0.17 87 < 2< 2730 ND32S/13E-30F01 1/24/2011 510 75 64 4 34 18 83 140 —< 1 0.17 0.11 < 0.1 < 0.005 < 0.1 83 < 2< 2780 < 0.132S/13E-30F01 10/21/2010 540 100 73 2 43 21 88 120 —< 1 0.067 < 0.1 ND < 0.005 < 0.3 88 < 10< 10894 < 0.132S/13E-30F01 7/26/2010 464 74 82.2 2.16 47.9 25.1 88 120 —< 0.5 0.0984 < 0.1 < 0.1 0.0817 0.37 88 < 1< 1710 0.793 32S/13E-30F01 4/27/2010 534 72 77.1 2.59 45.8 23.6 100 140 —0.56 0.129 < 0.1 < 0.1 0.112 0.29 100 < 1< 1780 1.02 32S/13E-30F01 1/28/2010 725 140 99.9 2.7 76.4 35.8 214 170 —0.84 0.12 < 0.1 < 0.1 0.112 0.56 214 < 1< 11200 0.64 32S/13E-30F01 10/19/2009 522 74 85.6 2.35 52.8 26.3 102 150 —0.7 0.136 0.13 < 0.1 0.123 0.32 102 < 1< 1770 1.3 32S/13E-30F01 8/19/2009 648 92 98.9 3.84 63.1 31.9 113 190 —0.56 ND < 0.1 0.12 1.03 0.32 113 < 1< 1970 4.52 32S/13E-30F01 5/12/2009 792 110 108 2.89 80.2 39.9 136 280 —ND ND < 0.1 ND 0.0353 0.39 136 < 1< 11200 0.281 P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Quality.xlsx2/2/2024Page 281 of 306
Appendix A: NCMA Sentry Wells Water Level DataWell DateTotal Dissolved SolidsChloride Sodium Potassium Calcium MagnesiumAlkalinity, Bicarbonate (as CaCO3)Sulfate Nitrite (as N)Total Kjeldahl NitrogenBoron Fluoride Iodide Manganese BromideAlkalinity, Total (as CaCO3)Alkalinity, Carbonate (as CaCO3)Alkalinity, Hydroxide (as CaCO3)Specific ConductanceIron32S/13E-30F02 10/11/2023 490 49 44 2.5 73 30 190 120 < 0.02 < 0.41 0.056 J 0.12 0.0051 0.067 0.55 190 < 3< 3830 < 0.01432S/13E-30F02 7/5/2023 560 49 45 2.6 76 30 190 120 —< 0.41 0.06 J 0.11 0.0025 0.038 0.62 190 < 3< 3830 < 0.01432S/13E-30F02 4/12/2023 540 54 48 2.7 83 33 190 130 < 0.02 < 0.41 0.09 J 0.12 0.0029 0.012 0.6 190 < 3< 3850 < 0.01432S/13E-30F02 2/8/2023 540 49 46 2.7 80 31 190 130 < 0.02 < 0.41 0.075 J 0.12 0.0045 0.028 0.57 190 < 3< 3850 < 0.01432S/13E-30F02 10/4/2022 570 50 46 2.5 75 32 180 120 < 0.01 < 0.088 0.088 J 0.059 < 0.005 0.0067 J 0.53 180 < 4.1 < 4.1836 < 0.0332S/13E-30F02 7/12/2022 560 56 46 2.6 79 32 180 130 < 0.010.21 0.11 0.09 < 0.005 0.0079 J 0.62 180 < 4.1 < 4.1873 < 0.0332S/13E-30F02 4/6/2022 530 49 43 2.4 72 29 180 120 < 0.05< 0.2 0.092 J 0.063 < 0.1 0.008 J 0.54 180 < 4.1 < 4.1837 < 0.0532S/13E-30F02 1/5/2022 580 51 42 2.3 71 29 190 130 < 0.05< 0.2 0.076 J 0.085 < 0.1 0.076 0.6 190 < 4.1 < 4.1838 < 0.0532S/13E-30F02 10/6/2021 550 53 46 2.3 77 31 180 130 < 0.05 0.15 J 0.11 0.093 < 0.1 0.052 0.66 180 < 4.1 < 4.1838 < 0.0532S/13E-30F02 7/16/2021 580 51 47 2.7 78 31 190 130 < 0.05 0.12 J 0.12 0.093 < 0.1 0.0073 J 0.62 190 < 4.1 < 4.1834 < 0.0532S/13E-30F02 4/7/2021 560 53 46 2.4 75 32 180 130 < 0.01 0.16 J 0.078 J 0.093 < 0.005 0.014 0.59 180 < 4.1 < 4.1— < 0.0332S/13E-30F02 1/6/2021 550 52 44 2.6 73 31 180 130 < 0.010.45 0.088 0.085 < 0.005 0.0082 0.6 180 < 4.1 < 4.1823 < 0.0332S/13E-30F02 10/12/2020 540 52 45 2.4 76 30 180 130 < 0.01 0.19 J 0.082 J 0.085 < 0.005 0.0076 J 0.62 180 < 4.1 < 4.1836 < 0.0332S/13E-30F02 7/7/2020 600 53 51 2.7 83 33 180 130 < 0.01 < 0.088 0.097 J 0.08 < 0.01 0.012 0.68 180 < 4.1 < 4.1845 < 0.0332S/13E-30F02 4/22/2020 580 52 47 2.6 78 31 180 130 < 0.01 0.18 J 0.086 J 0.086 < 0.01 0.015 0.66 180 < 4.1 < 4.1857 0.046 J32S/13E-30F02 1/14/2020 550 53 48 2.8 84 32 180 130 < 0.010.1 J 0.096 J 0.079 < 0.01 0.021 0.4 180 < 4.1 < 4.1808 0.07 32S/13E-30F02 10/14/2019 550 51 50 2.7 83 32 180 130 < 0.01 < 0.067 0.097 J 0.077 < 0.01 0.15 0.63 180 < 4.1 < 4.1841 0.06 32S/13E-30F02 7/9/2019 620 51 47 2.5 82 35 190 120 < 0.01 0.13 J 0.092 J 0.084 < 0.01 0.017 0.49 190 < 4.1 < 4.1838 < 0.0332S/13E-30F02 4/10/2019 570 53 43 2.7 78 32 180 130 < 0.01 0.085 J 0.093 J 0.09 < 0.01 0.046 0.47 180 < 4.1 < 4.1852 0.047 J32S/13E-30F02 1/8/2019 560 52 44 2.7 80 34 190 130 < 0.01 0.059 J 0.094 J 0.091 < 0.01 0.013 0.62 190 < 4.1 < 4.1845 < 0.0332S/13E-30F02 10/10/2018 580 51 50 2.9 83 35 190 130 < 0.01 0.073 J 0.094 J 0.067 < 0.01 0.02 0.42 190 < 4.1 < 4.1848 0.072 32S/13E-30F02 7/10/2018 580 53 48 2.7 83 36 190 130 < 0.010.23 0.095 J 0.11 < 0.01 0.026 0.59 190 < 4.1 < 4.1893 0.045 J32S/13E-30F02 4/12/2018 580 48 48 2.8 82 35 190 120 < 0.01 0.12 J 0.097 J 0.072 < 0.01 0.022 0.48 190 < 4.1 < 4.1854 < 0.0332S/13E-30F02 1/11/2018 580 52 51 2.7 82 36 200 130 < 0.01 0.14 J 0.091 J 0.12 < 0.01 0.032 0.68 200 < 4.1 < 4.1846 < 0.0332S/13E-30F02 10/11/2017 580 51 46 2.6 80 34 200 130 < 0.01 0.16 J 0.094 J 0.083 < 0.01 0.037 0.65 200 < 4.1 < 4.1877 0.037 J32S/13E-30F02 7/12/2017 570 52 49 2.9 89 39 200 130 < 0.01 < 0.088 0.094 J 0.096 < 0.01 0.15 0.66 200 < 4.1 < 4.1861 < 0.0332S/13E-30F02 4/12/2017 620 52 51 2.9 88 38 200 130 < 0.01 < 0.088 0.088 J 0.063 < 0.01 0.022 0.67 200 < 4.1 < 4.1856 0.041 J32S/13E-30F02 1/10/2017 590 52 50 2.8 90 37 220 140 < 0.01 < 0.088 0.09 J 0.08 < 0.01 1.1 0.6 220 < 4.1 < 4.1884 0.15 32S/13E-30F02 10/11/2016 600 52 50 2.9 89 40 220 140 0.021 J 0.089 J 0.09 J 0.074 < 0.01 0.025 0.6 220 < 4.1 < 4.1886 < 0.0332S/13E-30F02 7/20/2016 590 51 51 3 88 38 220 130 —0.14 0.091 0.072 < 0.01 0.17 0.57 220 < 4.1 < 4.1880 0.033 32S/13E-30F02 4/13/2016 570 51 51 2.9 89 40 200 130 —0.082 0.1 0.086 < 0.01 0.014 0.6 200 < 4.1 < 4.1876 < 0.0332S/13E-30F02 1/13/2016 610 53 51 2.9 89 38 210 140 —0.14 0.091 0.15 < 0.01 0.035 0.47 210 < 4.1 < 4.1858 < 0.0332S/13E-30F02 10/14/2015 570 49 45 2.8 80 35 212 130 —< 1 0.085 < 0.1 < 0.01 0.2 0.39 212 < 10< 10890 0.078 32S/13E-30F02 7/15/2015 610 50 51 2 88 38 204 140 —< 1 0.091 < 0.1 < 0.01 0.048 0.3 204 < 10< 10890 < 0.0532S/13E-30F02 4/15/2015 570 51 43 2.7 78 34 200 140 —< 1 0.085 < 0.1 < 0.01 0.087 0.42 200 < 10< 10850 < 0.0532S/13E-30F02 1/14/2015 590 51 42 2.4 80 34 210 140 —< 1 0.079 < 0.1 < 0.01 0.014 0.324 210 < 10< 10860 < 0.0532S/13E-30F02 10/14/2014 600 46 42 2.6 76 32 310 120 —< 1 0.077 < 0.1 < 0.01 0.22 0.37 310 < 10< 10890 < 0.0532S/13E-30F02 7/30/2014 580 49 46 2.6 80 35 210 130 —< 1 < 0.1 < 0.1 < 0.01 0.02 0.27 210 < 10< 10890 < 0.0532S/13E-30F02 4/16/2014 590 49 45 3.3 68 30 200 130 —< 1 0.089 < 0.1 < 0.01 0.011 0.44 200 < 10< 10890 < 0.0532S/13E-30F02 1/15/2014 580 50 45 2.7 76 31 190 136 —13.4 < 0.1 < 0.1 < 0.01 0.054 0.4 190 < 10< 10890 < 0.0532S/13E-30F02 10/15/2013 570 50 45 2.7 75 33 190 140 —< 1 0.69 0.19 < 0.01 0.099 0.38 190 < 10< 10890 < 0.0532S/13E-30F02 7/10/2013 570 50 38 2.6 78 32 190 180 —< 1 0.082 0.13 < 0.01 0.14 < 0.1 190 < 10< 10880 < 0.0532S/13E-30F02 4/11/2013 590 50 41 2.6 70 30 190 140 —< 1 0.088 0.1 < 0.01 0.082 0.43 190 < 10< 10880 < 0.0532S/13E-30F02 1/15/2013 550 50 44 2.9 72 31 200 140 —< 1 0.086 0.1 < 0.01 0.011 0.32 200 < 10< 10880 0.12 32S/13E-30F02 10/30/2012 610 48 45 3 79 34 188 135 —< 1 0.088 < 0.1 < 0.01 0.06 0.31 188 < 10< 10890 0.011 32S/13E-30F02 7/24/2012 590 56 46 3.2 69 30 194 140 —< 1 < 0.1 0.11 < 0.01 0.038 0.27 194 < 10< 10880 < 0.0532S/13E-30F02 4/19/2012 600 60 40 2.7 68 30 200 140 —< 1 < 0.1 < 0.2 < 0.01 0.19 0.3 200 < 10< 10890 0.11 32S/13E-30F02 1/12/2012 610 52 45 3 73 32 200 130 —< 1 < 0.1 0.25 < 0.02 0.29 0.33 200 < 10< 10890 < 0.132S/13E-30F02 11/21/2011 580 49 38 2.7 73 30 190 120 —< 1 0.067 < 0.1 < 0.01 0.022 0.34 190 < 10< 10870 < 0.132S/13E-30F02 7/25/2011 590 52.1 46 5.1 73 31 190 134.3 —< 1 < 0.1 0.127 < 0.1 0.025 0.387 190 < 5< 5900 < 0.132S/13E-30F02 4/20/2011 600 54 57 4.2 74 29 200 141 —< 1 0.18 0.17 < 0.01 0.025 0.38 200 < 2< 2920 ND32S/13E-30F02 1/24/2011 600 51 43 4.9 71 31 210 140 —< 1 0.15 0.12 0.27 0.041 0.3 210 < 2< 2920 < 0.132S/13E-30F02 10/28/2010 610 49 38 2.3 70 30 210 130 —< 1 0.1 < 0.1 ND 0.0094 < 0.3 210 < 10< 10920 < 0.132S/13E-30F02 7/26/2010 560 49 45.8 2.95 85.4 36.8 223 130 —2.5 0.0928 < 0.1 0.13 0.0646 0.59 223 < 1< 1890 < 0.1P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Quality.xlsx2/2/2024Page 282 of 306
Appendix A: NCMA Sentry Wells Water Level DataWell DateTotal Dissolved SolidsChloride Sodium Potassium Calcium MagnesiumAlkalinity, Bicarbonate (as CaCO3)Sulfate Nitrite (as N)Total Kjeldahl NitrogenBoron Fluoride Iodide Manganese BromideAlkalinity, Total (as CaCO3)Alkalinity, Carbonate (as CaCO3)Alkalinity, Hydroxide (as CaCO3)Specific ConductanceIron32S/13E-30F02 4/27/2010 634 51 50.3 3.12 87.9 38.6 225 130 —0.84 0.112 < 0.1 < 0.1 0.615 0.51 225 < 1< 1880 3.28 32S/13E-30F02 1/28/2010 604 44 52.2 4.47 92.1 38.5 230 150 —1.4 0.127 < 0.1 < 0.1 0.913 0.48 230 < 1< 1920 4.55 32S/13E-30F02 10/19/2009 566 49 49.5 2.8 88.3 37.6 240 140 —1 0.0942 0.17 < 0.1 0.924 0.51 240 < 1< 1850 2.15 32S/13E-30F02 8/19/2009 614 49 51.8 3.19 87.3 36.8 225 130 —2 ND 0.1 < 0.1 2.24 0.54 225 < 1< 1920 19.4 32S/13E-30F02 5/12/2009 514 54 48.7 3.26 81.1 34.9 206 120 —ND ND 0.11 ND 1.87 0.53 206 < 1< 1890 3.23 32S/13E-30F02 3/27/1996 678 49 52 3.8 98 42 305 166 —ND 0.16 ND ND ND NDNDNDNDND ND32S/13E-30F02 6/9/1976 637 48 55 2.8 98 43 343 172 —ND 0.1 0.5 ND ND NDNDNDNDND ND32S/13E-30F02 1/20/1966 580 68 47 2 94 38 280 152 —ND 0.08 0.2 ND ND NDNDNDNDND NDP:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Quality.xlsx2/2/2024Page 283 of 306
Appendix A: NCMA Sentry Wells Water Level DataWell DateTotal Dissolved SolidsChloride Sodium Potassium Calcium MagnesiumAlkalinity, Bicarbonate (as CaCO3)Sulfate Nitrite (as N)Total Kjeldahl NitrogenBoron Fluoride Iodide Manganese BromideAlkalinity, Total (as CaCO3)Alkalinity, Carbonate (as CaCO3)Alkalinity, Hydroxide (as CaCO3)Specific ConductanceIron32S/13E-30F03 10/11/2023 660 48 39 2.6 100 42 320 160 < 0.02 < 0.41 < 0.046 0.17 0.069 0.019 0.24 320 < 3< 3980 0.029 J32S/13E-30F03 7/5/2023 640 47 42 2.7 110 44 310 160 —< 0.41 0.05 J 0.18 0.063 0.02 0.24 310 < 3< 3980 0.028 J32S/13E-30F03 4/12/2023 660 50 43 2.7 110 47 330 170 < 0.02 < 0.41 0.056 J 0.17 0.056 0.021 0.24 330 < 3< 31000 0.03 J32S/13E-30F03 2/8/2023 640 51 41 2.6 100 42 320 170 < 0.02 < 0.41 < 0.046 0.17 0.067 0.021 0.24 320 < 3< 3980 0.051 32S/13E-30F03 10/4/2022 660 47 43 2.7 110 48 300 160 < 0.01 < 0.088 0.061 J 0.09 0.035 J 0.02 0.18 J 300 < 4.1 < 4.1978 0.046 J32S/13E-30F03 7/12/2022 570 53 40 2.5 110 46 300 170 < 0.01 < 0.088 0.076 J 0.15 0.034 J 0.02 0.22 300 < 8.2 < 8.2 1010 < 0.0332S/13E-30F03 4/6/2022 570 46 38 2.4 99 41 310 170 < 0.05 0.12 J 0.056 J 0.1 0.035 J 0.02 0.17 J 310 < 4.1 < 4.1981 0.03 J32S/13E-30F03 1/5/2022 660 48 40 2.6 110 45 310 170 < 0.05< 0.2 0.072 J 0.13 0.035 J 0.019 0.22 310 < 4.1 < 4.1985 < 0.0532S/13E-30F03 10/6/2021 640 50 42 2.3 110 46 300 170 < 0.05 0.15 J 0.078 J 0.14 0.052 J 0.018 0.25 300 < 4.1 < 4.1982 < 0.0532S/13E-30F03 7/16/2021 660 48 39 2.4 99 43 310 170 < 0.05 0.15 J 0.083 J 0.13 0.038 J 0.019 0.23 310 < 4.1 < 4.1975 < 0.0532S/13E-30F03 4/7/2021 650 49 40 2.4 100 43 310 170 < 0.01 0.097 J 0.05 J 0.15 0.029 J 0.019 0.24 310 < 4.1 < 4.1— 0.033 J32S/13E-30F03 1/6/2021 660 50 43 2.7 110 46 310 170 < 0.010.32 0.064 0.15 0.037 0.025 0.27 310 < 4.1 < 4.1971 0.05 32S/13E-30F03 10/12/2020 710 49 41 2.5 110 43 310 170 < 0.01 < 0.088 0.055 J 0.14 0.037 J 0.019 0.21 310 < 4.1 < 4.1975 0.039 J32S/13E-30F03 7/7/2020 720 50 42 2.6 110 45 290 170 < 0.010.1 J 0.064 J 0.12 0.038 J 0.019 0.22 290 < 4.1 < 4.1985 < 0.0332S/13E-30F03 4/22/2020 620 49 41 2.6 110 44 310 170 < 0.010.1 J 0.055 J 0.14 0.042 J 0.019 0.23 310 < 4.1 < 4.1999 0.065 32S/13E-30F03 1/14/2020 600 49 41 2.6 110 44 300 170 < 0.01 0.083 J 0.062 J 0.12 0.044 J 0.021 0.16 J 300 < 4.1 < 4.1940 0.071 32S/13E-30F03 10/14/2019 620 47 44 2.7 110 44 300 170 0.023 J < 0.067 0.064 J 0.12 0.035 J 0.021 0.16 J 300 < 4.1 < 4.1980 0.092 32S/13E-30F03 7/9/2019 760 47 41 2.5 110 49 310 170 < 0.01 0.094 J 0.061 J 0.14 0.039 J 0.02 0.21 310 < 4.1 < 4.1975 0.039 J32S/13E-30F03 4/10/2019 630 49 37 2.5 100 45 310 170 < 0.01 0.14 J 0.06 J 0.14 0.03 J 0.02 0.19 J 310 < 4.1 < 4.1988 0.054 32S/13E-30F03 1/8/2019 660 48 39 2.6 110 46 310 170 < 0.01 0.068 J 0.063 J 0.15 0.037 J 0.02 0.22 310 < 4.1 < 4.1990 0.078 32S/13E-30F03 10/10/2018 650 48 44 2.9 120 51 310 170 < 0.01 0.12 J 0.067 J 0.1 0.036 J 0.022 0.16 310 < 4.1 < 4.1981 0.05 32S/13E-30F03 7/10/2018 630 49 42 2.6 110 49 310 170 < 0.01 < 0.084 0.062 J 0.18 0.035 J 0.019 0.22 310 < 8.2 < 8.2 1030 < 0.0332S/13E-30F03 4/12/2018 640 45 43 2.6 110 46 300 160 < 0.01 0.15 J 0.066 J 0.14 0.036 J 0.021 0.16 300 < 4.1 < 4.1980 0.035 J32S/13E-30F03 1/11/2018 650 48 45 2.8 120 51 310 170 < 0.01 0.13 J 0.044 J 0.15 0.041 J 0.021 0.26 310 < 4.1 < 4.1966 0.037 J32S/13E-30F03 10/11/2017 660 47 42 2.6 110 50 320 170 < 0.01 0.13 J 0.067 J 0.13 0.037 J 0.021 0.2 320 < 4.1 < 4.1996 0.056 32S/13E-30F03 7/12/2017 750 46 44 3 120 53 280 170 < 0.01 < 0.088 0.064 J 0.14 0.035 J 0.023 0.2 280 < 4.1 < 4.1980 0.046 J32S/13E-30F03 4/12/2017 640 48 45 2.9 120 51 310 170 < 0.01 < 0.088 0.076 J 0.16 0.035 J 0.022 0.22 310 < 4.1 < 4.1972 0.065 32S/13E-30F03 1/10/2017 670 49 44 2.7 120 51 330 170 < 0.01 < 0.088 0.064 J 0.13 0.045 J 0.023 0.31 330 < 4.1 < 4.1993 0.14 32S/13E-30F03 10/11/2016 680 48 41 2.6 110 49 320 170 0.021 J 0.11 J 0.056 J 0.13 0.042 J 0.02 0.22 320 < 4.1 < 4.1992 < 0.0332S/13E-30F03 7/20/2016 660 47 44 2.9 110 51 320 170 —< 0.08 0.062 0.12 0.032 0.023 0.2 320 < 4.1 < 4.1992 0.04 32S/13E-30F03 4/13/2016 650 47 42 2.7 110 51 310 170 —0.23 0.072 0.13 0.028 0.021 0.22 310 < 4.1 < 4.1981 0.03 32S/13E-30F03 1/14/2016 580 49 45 2.8 120 52 310 180 —0.12 0.061 0.2 < 0.01 0.025 0.21 310 < 4.1 < 4.1947 0.054 32S/13E-30F03 10/14/2015 660 44 38 2.8 100 44 306 160 —< 1 < 0.05 0.13 0.028 0.021 0.1 306 < 10< 10990 < 0.0532S/13E-30F03 7/15/2015 670 45 45 1.9 120 51 305 170 —< 1 0.06 0.11 0.03 0.019 < 0.1 305 < 10< 10990 < 0.0532S/13E-30F03 4/15/2015 650 46 35 2.3 99 44 300 170 —< 1 0.056 0.126 0.02 0.015 0.1 300 < 10< 10950 < 0.0532S/13E-30F03 1/14/2015 670 46 36 2.2 100 45 310 180 —< 1 0.05 0.121 0.02 0.016 < 0.1 310 < 10< 10950 0.013 32S/13E-30F03 10/14/2014 660 41 35 3 99 42 310 150 —< 1 < 0.05 < 0.1 0.011 0.017 < 0.1 310 < 10< 10990 < 0.0532S/13E-30F03 7/30/2014 660 44 38 2.6 96 46 300 160 —< 1 0.28 0.12 0.02 0.015 < 0.1 300 < 10< 10990 < 0.0532S/13E-30F03 4/16/2014 640 44 36 3.3 55 38 310 169 —< 1 0.062 0.12 0.02 0.011 0.11 310 < 10< 10990 < 0.0532S/13E-30F03 1/15/2014 650 45 35 2.5 90 41 300 173 —< 1 < 0.05 0.13 0.01 0.015 0.12 300 < 10< 10990 < 0.0532S/13E-30F03 10/15/2013 670 41 40 2.7 100 44 280 179 —< 1 < 0.05 0.14 0.02 0.016 < 0.1 280 < 10< 10990 < 0.0532S/13E-30F03 7/10/2013 650 50 33 2.4 100 43 290 140 —< 1 0.055 < 0.1 0.02 0.017 0.23 290 < 10< 10990 < 0.0532S/13E-30F03 4/11/2013 670 45 36 2.7 94 42 300 170 —< 1 0.061 0.13 0.02 0.016 0.12 300 < 10< 10990 < 0.0532S/13E-30F03 1/15/2013 630 45 36 2.3 92 41 295 180 —< 1 0.059 0.11 < 0.01 0.015 < 0.1 295 < 10< 10980 < 0.0532S/13E-30F03 10/30/2012 650 43 40 3.1 100 46 280 170 —< 1 0.058 < 0.1 0.03 0.016 < 0.1 280 < 10< 10990 0.019 32S/13E-30F03 7/24/2012 640 51 36 2.7 81 37 296 180 —< 1 < 0.1 0.17 < 0.01 0.016 0.2 296 < 10< 10990 < 0.0532S/13E-30F03 4/19/2012 640 54 32 2.3 84 36 290 180 —< 1 < 0.1 < 0.2 0.01 0.014 < 0.2 290 < 10< 10990 < 0.132S/13E-30F03 1/12/2012 660 46 39 2.1 94 42 280 160 —< 1 < 0.1 0.2 0.025 0.016 < 0.2 280 < 10< 10990 < 0.132S/13E-30F03 11/21/2011 650 43 33 2.6 93 39 290 160 —< 1 0.036 0.15 0.028 0.016 < 0.1 290 < 10< 10960 < 0.132S/13E-30F03 7/25/2011 650 46.5 46 5.1 73 31 190 170.5 —< 1 < 0.1 0.155 0.02 0.025 < 0.1 190 < 5< 5900 < 0.132S/13E-30F03 4/21/2011 650 48 40 3.8 91 34 280 179 —< 1 0.1 0.2 0.029 0.015 0.11 280 < 2< 21000 ND32S/13E-30F03 1/24/2011 650 46 36 4.7 87 38 300 170 —< 1 0.11 0.17 0.24 0.016 < 0.1 300 < 2< 2990 < 0.132S/13E-30F03 10/28/2010 650 46 37 2.7 100 43 280 160 —< 1 0.1 < 0.1 ND 0.032 < 0.3 280 < 10< 101000 0.53 32S/13E-30F03 7/26/2010 608 45 43.8 2.94 107 46.8 294 160 —0.84 0.0479 < 0.1 0.1 0.129 0.24 294 < 1< 1900 7.55 P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Quality.xlsx2/2/2024Page 284 of 306
Appendix A: NCMA Sentry Wells Water Level DataWell DateTotal Dissolved SolidsChloride Sodium Potassium Calcium MagnesiumAlkalinity, Bicarbonate (as CaCO3)Sulfate Nitrite (as N)Total Kjeldahl NitrogenBoron Fluoride Iodide Manganese BromideAlkalinity, Total (as CaCO3)Alkalinity, Carbonate (as CaCO3)Alkalinity, Hydroxide (as CaCO3)Specific ConductanceIron32S/13E-30F03 4/27/2010 668 48 40.8 2.91 101 44.7 304 160 —0.84 0.0733 0.14 0.11 0.0694 0.23 304 < 1< 1940 2.62 32S/13E-30F03 1/28/2010 656 40 43.1 3.91 112 47.2 310 180 —2.8 0.0833 0.13 < 0.1 0.287 0.21 310 < 1< 1980 4.8 32S/13E-30F03 10/19/2009 626 48 43.3 3.14 108 46.2 308 170 —1.8 0.0646 0.22 < 0.1 0.255 0.17 308 < 1< 1910 2.09 32S/13E-30F03 8/19/2009 672 45 43.1 3.15 111 44.3 290 170 —2.5 ND 0.14 < 0.1 0.468 0.19 290 < 1< 1980 18.5 32S/13E-30F03 5/12/2009 678 49 44.8 3.32 109 42.9 276 180 —ND ND 0.17 ND 0.146 0.18 276 < 1< 1960 1.16 32S/13E-30F03 3/27/1996 686 41 40 3.4 109 48 379 197 —ND 0.13 ND ND ND NDNDNDNDND ND32S/13E-30F03 6/7/1976 616 43 41 2.6 96 49 333 190 —ND 0.05 0.5 ND ND NDNDNDNDND ND32S/13E-30F03 1/19/1966 642 69 49 4 109 40 321 182 —ND 0.05 0.3 ND ND NDNDNDNDND NDP:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Quality.xlsx2/2/2024Page 285 of 306
Appendix A: NCMA Sentry Wells Water Level DataWell DateTotal Dissolved SolidsChloride Sodium Potassium Calcium MagnesiumAlkalinity, Bicarbonate (as CaCO3)Sulfate Nitrite (as N)Total Kjeldahl NitrogenBoron Fluoride Iodide Manganese BromideAlkalinity, Total (as CaCO3)Alkalinity, Carbonate (as CaCO3)Alkalinity, Hydroxide (as CaCO3)Specific ConductanceIron32S/13E-30N01 10/11/2023 680 120 90 25 74 51 430 110 < 0.02 0.42 J 0.17 0.42 0.035 0.1 1 430 < 3< 31200 1.5 32S/13E-30N01 4/12/2023 760 120 100 27 79 54 370 150 < 0.02 < 0.41 0.19 0.35 0.022 0.11 1.1 370 < 3< 31300 1.7 32S/13E-30N01 10/4/2022 800 120 54 2.9 65 29 320 150 < 0.010.52 0.07 J 0.34 0.013 J < 0.004 1.1 320 < 8.2 < 8.2 1220 < 0.0332S/13E-30N01 4/6/2022 710 110 83 22 55 39 230 190 0.018 J 0.51 0.16 0.29 0.012 J 0.071 1.4 230 < 8.2 < 8.2 1140 1.4 32S/13E-30N01 10/6/2021 720 120 94 24 64 48 240 200 < 0.050.43 0.2 0.37 0.026 J 0.082 1.6 240 < 8.2 < 8.2 1160 1.5 32S/13E-30N01 4/7/2021 810 120 89 25 66 53 310 160 0.014 J 0.63 0.21 0.35 0.015 J 0.099 1.2 310 < 8.2 < 8.2— 2.2 32S/13E-30N01 10/12/2020 870 120 97 28 82 60 330 160 < 0.010.68 0.21 0.37 0.02 J 0.11 1.2 330 < 8.2 < 8.2 1260 2.7 32S/13E-30N01 4/21/2020 810 130 110 31 84 60 390 130 < 0.010.68 0.22 0.33 0.017 J 0.12 0.98 390 < 8.2 < 8.2 1340 3 32S/13E-30N01 10/15/2019 830 150 110 32 86 57 330 170 < 0.010.66 0.22 0.32 0.018 J 0.12 1.3 330 < 8.2 < 8.2 1340 2.6 32S/13E-30N01 4/9/2019 860 160 94 30 81 59 310 180 < 0.010.64 0.23 0.36 0.012 J 0.11 1.2 310 < 8.2 < 8.2 1370 2.8 32S/13E-30N01 10/10/2018 920 200 130 36 96 73 370 140 < 0.010.62 0.21 0.36 0.017 J 0.14 0.85 370 < 8.2 < 8.2 1500 3 32S/13E-30N01 4/11/2018 800 140 110 31 73 55 290 150 < 0.010.73 0.2 0.36 0.017 J 0.1 1.1 290 < 8.2 < 8.2 1280 2.4 32S/13E-30N01 10/10/2017 870 150 120 31 78 57 320 170 < 0.010.68 0.24 0.38 0.019 J 0.12 1.5 320 < 8.2 < 8.2 1350 3 32S/13E-30N01 4/11/2017 960 260 160 35 92 73 350 150 < 0.010.84 0.23 0.42 0.015 J 0.14 1.5 350 < 8.2 < 8.2 1690 3.9 32S/13E-30N01 10/12/2016 900 180 130 32 77 61 290 180 0.016 J 0.53 0.19 0.34 0.021 J 0.11 1.7 290 < 8.2 < 8.2 1420 2.7 32S/13E-30N01 4/12/2016 790 110 110 27 55 46 230 190 —0.51 0.18 0.42 0.013 0.071 1.7 230 < 8.2 < 8.2 1190 1.7 32S/13E-30N01 10/15/2015 740 120 100 27 52 41 250 190 —< 1 0.18 0.43 0.032 0.072 1.3 250 < 10< 101220 1.8 32S/13E-30N01 4/14/2015 930 190 130 28 69 54 360 170 —1.4 0.23 0.334 0.01 0.087 1.2 360 < 10< 101500 2.5 32S/13E-30N01 1/14/2015 845 170 110 29 71 54 320 180 —< 1 0.21 0.332 0.01 0.087 1.21 320 < 10< 101360 2.3 32S/13E-30N01 10/15/2014 790 140 110 30 62 53 300 160 —< 1 0.21 0.29 < 0.01 0.084 1.2 300 < 10< 101350 2.5 32S/13E-30N01 7/30/2014 800 150 110 27 61 52 310 160 —< 1 0.81 0.33 0.01 0.081 1.1 310 < 10< 101360 2.4 32S/13E-30N01 4/16/2014 850 160 112 26 55 43 310 170 —< 1 0.2 0.33 0.01 0.077 1.3 310 < 10< 101410 2.4 32S/13E-30N01 1/15/2014 790 154 110 26 56 45 260 190 —< 1 0.19 0.41 < 0.01 0.077 1.4 260 < 10< 101340 2.5 32S/13E-30N01 10/15/2013 950 200 140 32 74 60 330 180 —< 1 0.21 0.33 0.01 0.095 1.3 330 < 10< 101570 2.8 32S/13E-30N01 7/10/2013 830 175 120 29 71 54 310 185 —< 1 0.22 0.32 0.01 0.087 0.84 310 < 10< 101430 2.3 32S/13E-30N01 4/10/2013 860 180 120 29 67 54 320 180 —1.1 0.21 0.31 0.01 0.087 1.2 320 < 10< 101470 2.5 32S/13E-30N01 1/14/2013 800 170 120 32 66 53 280 200 —1.1 0.22 0.26 < 0.01 0.09 1.2 280 < 10< 101380 2.5 32S/13E-30N01 10/29/2012 900 180 120 34 77 60 300 190 —< 1 0.21 0.4 0.011 0.098 1.2 300 < 10< 101500 2.8 32S/13E-30N01 7/23/2012 840 190 120 31 56 45 266 200 —< 1 0.22 0.43 < 0.01 0.096 1.2 266 < 10< 101370 2.3 32S/13E-30N01 4/18/2012 1050 280 140 31 59 47 330 210 —1.4 0.2 0.5 < 0.01 0.078 1.3 330 < 10< 101680 2.4 32S/13E-30N01 1/10/2012 690 45 44 2.6 100 44 340 160 < 0.01< 1 < 0.02 0.2 < 0.01 0.024 < 0.1 340 < 10< 101070 0.1 32S/13E-30N01 1/9/2012 —— — — — ——— —— — — — — —307 ——— —32S/13E-30N01 11/17/2011 1300 360 320 40 90 69 390 220 —< 1 0.23 0.38 0.017 0.11 2.5 390 < 10< 102210 3.4 32S/13E-30N01 7/25/2011 1680 445.3 230 42 99 81 380 255.5 —1.2 0.21 < 0.1 < 0.01 0.12 3.016 380 < 5< 52480 4.2 32S/13E-30N01 4/20/2011 890 210 130 26 68 46 180 215 —< 1 0.24 0.39 0.013 0.086 4.57 180 < 2< 21550 ND32S/13E-30N01 1/24/2011 870 180 100 28 84 46 240 210 —< 1 < 0.1 0.34 0.12 0.24 3.63 240 < 2< 21430 18 32S/13E-30N01 10/21/2010 890 190 120 26 58 45 246 200 —< 1 < 0.1 0.37 ND 0.078 2.3 246 < 10< 101498 < 0.132S/13E-30N01 7/27/2010 917 200 130 30 75 56.2 241 220 —< 0.5 0.165 0.29 0.23 0.101 2.8 241 < 1< 11400 2.61 32S/13E-30N01 4/27/2010 808 150 130 29 136 55.6 286 210 —1.7 0.171 0.37 0.19 0.276 2.6 286 < 1< 11300 20.4 32S/13E-30N01 1/26/2010 902 210 155 33.5 156 66.4 307 230 —1.7 0.317 0.3 0.12 0.333 3.2 307 < 1< 11500 27.3 32S/13E-30N01 10/20/2009 828 200 159 34.3 118 59.8 238 230 —1.3 0.241 0.38 < 0.1 0.157 3.2 238 < 1< 11300 5.33 32S/13E-30N01 8/20/2009 835 160 150 27.8 121 49.4 235 220 —1.3 ND 0.37 0.12 0.228 2.9 235 < 1< 11400 15.9 32S/13E-30N01 5/11/2009 960 180 175 33.5 86.7 46.2 274 220 —ND ND 0.36 ND 0.113 3.2 274 < 1< 11500 2.26 P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Quality.xlsx2/2/2024Page 286 of 306
Appendix A: NCMA Sentry Wells Water Level DataWell DateTotal Dissolved SolidsChloride Sodium Potassium Calcium MagnesiumAlkalinity, Bicarbonate (as CaCO3)Sulfate Nitrite (as N)Total Kjeldahl NitrogenBoron Fluoride Iodide Manganese BromideAlkalinity, Total (as CaCO3)Alkalinity, Carbonate (as CaCO3)Alkalinity, Hydroxide (as CaCO3)Specific ConductanceIron32S/13E-30N03 10/11/2023 480 61 49 2.9 59 27 140 130 < 0.02 < 0.41 0.065 J 0.21 0.0012 < 0.0045 0.52 140 < 3< 3800 < 0.01432S/13E-30N03 7/5/2023 520 62 54 3.1 64 28 130 130 —< 0.41 0.072 J 0.21 < 0.00045< 0.0045 0.6 130 < 3< 3790 < 0.01432S/13E-30N03 4/12/2023 530 63 58 3.2 69 31 150 120 < 0.02 < 0.41 0.073 J 0.21 ND 0.005 J 0.61 150 < 3< 3820 < 0.01432S/13E-30N03 2/8/2023 510 63 50 2.8 64 26 140 130 < 0.02 < 0.41 0.06 J 0.22 0.001 0.0093 J 0.59 140 < 3< 3810 < 0.01432S/13E-30N03 10/4/2022 570 65 110 28 75 55 130 130 < 0.01 0.15 J 0.19 0.17 < 0.005 0.099 0.54 130 < 4.1 < 4.1804 1.9 32S/13E-30N03 7/12/2022 550 67 54 3 66 29 130 130 < 0.01 0.11 J 0.098 J 0.18 < 0.005 < 0.004 0.62 130 < 4.1 < 4.1832 < 0.0332S/13E-30N03 4/6/2022 520 62 48 2.6 58 25 130 130 < 0.05 0.096 J 0.074 J 0.14 < 0.1 < 0.01 0.57 130 < 4.1 < 4.1811 < 0.0532S/13E-30N03 1/5/2022 520 63 52 2.9 62 26 140 130 < 0.05 0.11 J 0.085 J 0.16 < 0.1 < 0.01 0.61 140 < 4.1 < 4.1827 0.054 32S/13E-30N03 10/6/2021 560 66 54 2.7 65 28 140 130 < 0.05< 0.2 0.096 J 0.2 < 0.1 0.0079 J 0.7 140 < 4.1 < 4.1818 < 0.0532S/13E-30N03 7/15/2021 590 64 54 2.9 66 28 130 130 < 0.05 0.15 J 0.037 J 0.2 < 0.1 < 0.01 0.63 130 < 4.1 < 4.1820 < 0.0532S/13E-30N03 4/7/2021 510 66 56 3 65 30 140 130 < 0.01 0.12 J 0.078 J 0.18 < 0.005 < 0.004 0.76 140 < 4.1 < 4.1— < 0.0332S/13E-30N03 1/7/2021 580 60 56 2.9 68 30 140 120 < 0.011.1 0.078 0.15 < 0.005 < 0.004 0.49 140 < 4.1 < 4.1821 < 0.0332S/13E-30N03 10/12/2020 600 66 58 3.2 74 32 140 140 < 0.01 0.13 J 0.089 J 0.18 < 0.005 < 0.004 0.75 140 < 4.1 < 4.1848 < 0.0332S/13E-30N03 7/7/2020 590 73 62 3.3 75 32 140 140 < 0.01 0.16 J 0.095 J 0.16 < 0.01 0.0043 J 0.86 140 < 4.1 < 4.1872 0.083 32S/13E-30N03 4/21/2020 590 69 57 3.2 71 30 140 140 < 0.01 0.17 J 0.081 J 0.22 < 0.01 0.09 0.77 140 < 4.1 < 4.1882 0.066 32S/13E-30N03 1/15/2020 630 68 60 3.3 78 32 140 140 < 0.01 < 0.067 0.089 J 0.15 < 0.01 0.0096 J 0.65 140 < 4.1 < 4.1834 0.16 32S/13E-30N03 10/15/2019 560 67 60 3.2 76 31 150 140 < 0.01 0.14 J 0.088 J 0.17 < 0.01 0.11 0.86 150 < 4.1 < 4.1875 0.15 32S/13E-30N03 7/9/2019 640 67 55 3 72 33 140 130 < 0.01 0.14 J 0.082 J 0.18 < 0.01 < 0.004 0.77 140 < 4.1 < 4.1860 < 0.0332S/13E-30N03 4/9/2019 580 71 51 3.1 68 30 150 130 < 0.01 0.18 J 0.088 J 0.18 < 0.01 0.027 0.6 150 < 4.1 < 4.1867 < 0.0332S/13E-30N03 1/9/2019 560 69 54 3.2 72 31 150 130 < 0.01 0.084 J 0.087 J 0.2 < 0.01 < 0.004 0.71 150 < 4.1 < 4.1858 < 0.0332S/13E-30N03 10/10/2018 540 68 59 3.4 71 32 150 130 < 0.01 < 0.036 0.091 J 0.21 < 0.01 0.012 0.53 150 < 4.1 < 4.1847 0.03 J32S/13E-30N03 7/12/2018 550 62 54 3.2 69 31 150 120 0.012 J 0.16 J 0.084 J 0.17 < 0.01 0.063 0.61 150 < 4.1 < 4.1866 0.076 32S/13E-30N03 4/11/2018 590 62 58 3.3 72 33 150 120 < 0.01 0.19 J 0.094 J 0.16 < 0.01 0.0058 J 0.51 150 < 4.1 < 4.1839 < 0.0332S/13E-30N03 1/11/2018 580 64 61 3.3 74 34 150 140 < 0.010.2 0.088 J 0.19 < 0.01 0.33 0.61 150 < 4.1 < 4.1836 0.12 32S/13E-30N03 10/10/2017 580 63 54 3.2 73 33 150 130 < 0.010.24 0.1 0.16 < 0.01 0.86 0.64 150 < 4.1 < 4.1836 0.59 32S/13E-30N03 7/11/2017 560 64 60 3.2 77 34 150 140 < 0.010.1 J 0.089 J 0.14 < 0.01 0.54 0.66 150 < 4.1 < 4.1871 0.18 32S/13E-30N03 4/11/2017 560 69 62 3.6 82 36 160 140 < 0.01 0.12 J 0.08 J 0.15 < 0.01 0.62 0.69 160 < 4.1 < 4.1866 0.43 32S/13E-30N03 1/12/2017 580 69 62 3.6 83 38 170 150 < 0.01 0.13 J 0.088 J 0.13 < 0.01 3.3 0.74 170 < 4.1 < 4.1878 1.5 32S/13E-30N03 10/12/2016 580 68 62 3.5 80 37 170 140 0.016 J < 0.088 0.088 J 0.16 < 0.01 0.56 0.76 170 < 4.1 < 4.1879 0.17 32S/13E-30N03 7/19/2016 580 66 61 3.6 75 36 160 130 —0.2 0.084 0.16 < 0.01 0.03 0.76 160 < 4.1 < 4.1864 < 0.0332S/13E-30N03 4/12/2016 610 69 60 3.4 75 36 160 130 —0.16 0.078 0.18 < 0.01 0.0095 0.78 160 < 4.1 < 4.1895 < 0.0532S/13E-30N03 1/13/2016 570 72 62 3.4 77 35 160 140 —0.15 0.083 0.22 < 0.01 0.0089 0.66 160 < 4.1 < 4.1867 0.079 32S/13E-30N03 10/15/2015 570 63 54 3.3 69 32 162 130 —< 1 0.0161 0.23 < 0.01 0.015 0.56 162 < 10< 10860 < 0.0532S/13E-30N03 7/16/2015 580 65 65 3 81 35 160 140 —15.3 0.079 0.14 0.45 0.011 0.46 160 < 10< 10880 < 0.0532S/13E-30N03 4/14/2015 580 65 49 2.9 65 31 160 140 —< 1 0.078 < 0.1 < 0.01 < 0.005 0.47 160 < 10< 10860 < 0.0532S/13E-30N03 1/14/2015 610 68 53 3 73 34 170 150 —< 1 0.074 0.151 < 0.01 0.054 0.43 170 < 10< 10870 0.49 32S/13E-30N03 10/15/2014 560 59 52 3.5 67 32 160 130 —0.54 0.066 0.14 < 0.01 < 0.005 0.452 160 < 10< 10890 < 0.0532S/13E-30N03 7/30/2014 580 65 55 3.2 69 32 170 130 —< 1 < 0.1 0.16 < 0.01 < 0.005 0.34 170 < 10< 10910 < 0.0532S/13E-30N03 4/16/2014 610 63 55 4.3 65 29 170 140 —< 1 0.077 0.15 < 0.01 0.058 0.38 170 < 10< 10910 < 0.0532S/13E-30N03 1/15/2014 610 66 54 3.2 67 31 170 149 —15 < 0.1 0.16 < 0.01 0.065 0.46 170 < 10< 10910 0.27 32S/13E-30N03 10/15/2013 580 60 57 3.3 71 32 170 150 —< 1 0.057 0.16 < 0.01 0.37 0.41 170 < 10< 10910 0.1 32S/13E-30N03 7/10/2013 590 60 48 3.1 71 31 160 150 —< 1 0.074 0.18 < 0.01 1.3 0.17 160 < 10< 10900 0.43 32S/13E-30N03 4/10/2013 600 66 53 3.3 69 31 160 150 —< 1 0.11 0.18 < 0.01 0.064 0.35 160 < 10< 10910 < 0.0532S/13E-30N03 1/14/2013 570 66 55 3.4 68 30 165 150 —< 1 0.093 0.17 < 0.01 0.028 0.27 165 < 10< 10900 0.084 32S/13E-30N03 10/29/2012 610 60 56 3.7 74 33 155 148 —< 1 0.081 0.2 < 0.01 0.027 0.3 155 < 10< 10900 0.04 32S/13E-30N03 7/23/2012 600 71 56 3.5 61 28 152 200 —< 1 0.1 < 0.1 < 0.002 0.12 0.3 152 < 10< 10890 0.44 32S/13E-30N03 4/18/2012 570 80 47 3 57 25 150 150 —< 1 0.1 0.3 < 0.01 < 0.005 0.28 150 < 10< 10880 < 0.132S/13E-30N03 1/11/2012 570 67 55 3.9 68 30 140 130 —< 1 0.1 0.22 < 0.02 0.051 0.39 140 < 10< 10870 0.17 32S/13E-30N03 11/21/2011 600 67 47 3.2 64 28 140 130 —1.2 0.088 0.23 < 0.01 < 0.005 0.62 140 < 10< 10850 < 0.132S/13E-30N03 7/25/2011 590 67 47 5 54 24 290 139.8 —< 1 < 0.1 0.187 < 0.01 0.052 0.79 290 < 5< 5890 0.14 32S/13E-30N03 4/20/2011 580 76 58 4.2 62 23 140 142 —< 1 0.12 0.24 < 0.1 0.051 0.92 140 < 2< 2890 ND32S/13E-30N03 1/24/2011 570 76 48 4.8 55 25 130 130 —< 1 0.12 0.2 < 0.1 0.0088 1.7 130 < 2< 2900 < 0.132S/13E-30N03 10/21/2010 550 69 59 3.3 65 31 133 130 —< 1 < 0.1 0.1 ND < 0.005 1.1 133 < 10< 10886 < 0.132S/13E-30N03 7/27/2010 528 72 55.1 3.41 68.7 31 139 130 —< 0.5 0.0672 0.14 0.11 < 0.005 1.3 139 < 1< 1860 < 0.1P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Quality.xlsx2/2/2024Page 287 of 306
Appendix A: NCMA Sentry Wells Water Level DataWell DateTotal Dissolved SolidsChloride Sodium Potassium Calcium MagnesiumAlkalinity, Bicarbonate (as CaCO3)Sulfate Nitrite (as N)Total Kjeldahl NitrogenBoron Fluoride Iodide Manganese BromideAlkalinity, Total (as CaCO3)Alkalinity, Carbonate (as CaCO3)Alkalinity, Hydroxide (as CaCO3)Specific ConductanceIron32S/13E-30N03 4/27/2010 672 89 60.6 3.65 70.6 32.5 134 130 —< 0.5 0.0779 0.18 0.11 < 0.005 1.2 134 < 1< 1870 < 0.132S/13E-30N03 1/26/2010 606 110 75 4.51 77.8 34.3 126 130 —1.4 0.0654 0.15 < 0.1 0.013 1.3 126 < 1< 1990 0.653 32S/13E-30N03 10/20/2009 806 180 93.3 25.5 92.3 41.5 162 150 —2.2 0.107 0.26 < 0.1 0.245 1.4 162 < 1< 11200 0.344 32S/13E-30N03 8/20/2009 1070 190 151 61.6 112 44.2 130 130 —3.4 ND 0.2 < 0.1 0.151 1.6 130 < 1< 11700 1.93 32S/13E-30N03 5/12/2009 602 97 63.4 3.96 72.9 32.2 122 120 —ND ND 0.22 ND 24 1.2 122 < 1< 1900 2.24 32S/13E-30N03 3/27/1996 624 70 62 4 78 35 150 161 —ND 0.13 ND ND ND NDNDNDNDND ND32S/13E-30N03 6/7/1976 705 90 54 2.9 99 43 189 168 —ND 0.08 0.5 ND ND NDNDNDNDND ND32S/13E-30N03 1/21/1966 804 57 54 3 132 59 410 250 —ND 0.08 0.5 ND ND NDNDNDNDND NDP:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Quality.xlsx2/2/2024Page 288 of 306
Appendix A: NCMA Sentry Wells Water Level DataWell DateTotal Dissolved SolidsChloride Sodium Potassium Calcium MagnesiumAlkalinity, Bicarbonate (as CaCO3)Sulfate Nitrite (as N)Total Kjeldahl NitrogenBoron Fluoride Iodide Manganese BromideAlkalinity, Total (as CaCO3)Alkalinity, Carbonate (as CaCO3)Alkalinity, Hydroxide (as CaCO3)Specific ConductanceIron32S/13E-30N02 10/11/2023 1100 48 67 4.5 140 57 200 490 0.029 J3.9 0.13 0.15 0.0092 < 0.0045 0.16 200 < 3< 31300 < 0.01432S/13E-30N02 7/5/2023 1000 49 70 4.6 140 56 200 470 D —< 0.41 0.11 0.16 < 0.00045< 0.0045 0.16 200 < 3< 31300 < 0.01432S/13E-30N02 4/13/2023 990 49 71 4.5 130 56 200 500 < 0.02 < 0.41 0.12 0.14 ND < 0.0045 0.15 200 < 3< 31300 < 0.01432S/13E-30N02 2/8/2023 1000 48 69 4.6 140 56 210 490 < 0.02 < 0.41 0.12 0.15 0.001 < 0.0045 0.16 210 < 3< 31300 < 0.01432S/13E-30N02 10/4/2022 1100 46 75 4.7 150 63 190 490 < 0.01 < 0.088 0.14 0.066 J < 0.005 < 0.004 < 0.14 190 < 8.2 < 8.2 1350 < 0.0332S/13E-30N02 7/12/2022 980 54 73 4.7 150 61 190 500 < 0.01 < 0.088 0.16 0.1 < 0.005 < 0.004 0.15 J 190 < 8.2 < 8.2 1410 < 0.0332S/13E-30N02 4/6/2022 980 48 62 4 130 51 190 480 0.014 J < 0.2 0.13 0.074 < 0.1 < 0.01 0.11 J 190 < 8.2 < 8.2 1340 < 0.0532S/13E-30N02 1/5/2022 920 44 65 4.4 130 55 190 490 < 0.050.24 0.14 0.11 < 0.1 < 0.01 < 0.4 190 < 8.2 < 8.2 1350 < 0.0532S/13E-30N02 10/6/2021 930 51 70 3.9 140 58 190 490 < 0.05< 0.2 0.16 0.12 0.011 J < 0.01 0.14 J 190 < 8.2 < 8.2 1340 < 0.0532S/13E-30N02 7/15/2021 1100 45 65 4.1 140 54 190 500 < 0.050.24 0.11 0.12 < 0.1 < 0.01 < 0.4 190 < 8.2 < 8.2 1350 < 0.0532S/13E-30N02 4/7/2021 1000 43 70 4.4 140 57 200 490 < 0.01 0.13 J 0.14 0.13 < 0.005 < 0.004 < 0.14 200 < 8.2 < 8.2— < 0.0332S/13E-30N02 1/7/2021 980 47 76 4.7 150 62 190 490 < 0.010.35 0.15 0.12 < 0.005 < 0.004 < 0.14 190 < 8.2 < 8.2 1320 < 0.0332S/13E-30N02 10/12/2020 1100 50 73 4.7 150 61 190 510 < 0.01 < 0.088 0.15 0.11 < 0.005 < 0.004 0.13 J 190 < 8.2 < 8.2 1350 < 0.0332S/13E-30N02 7/7/2020 1100 50 77 4.7 160 62 190 510 < 0.01 < 0.088 0.16 0.096 < 0.01 < 0.004 0.16 J 190 < 8.2 < 8.2 1350 < 0.0332S/13E-30N02 4/21/2020 1000 49 71 4.5 150 56 190 500 < 0.010.22 0.15 0.12 < 0.01 < 0.004 0.13 J 190 < 8.2 < 8.2 1370 0.068 32S/13E-30N02 1/15/2020 1100 49 77 4.9 160 61 190 470 < 0.01 0.15 J 0.15 0.077 < 0.01 < 4 0.13 J 190 < 8.2 < 8.2 1300 0.074 32S/13E-30N02 10/15/2019 1000 49 77 4.8 160 58 190 510 < 0.010.1 J 0.16 0.088 < 0.01 < 4 0.17 J 190 < 8.2 < 8.2 1350 0.15 32S/13E-30N02 7/9/2019 1200 48 73 4.6 150 64 190 470 < 0.010.45 0.15 0.096 < 0.01 < 0.004 0.12 J 190 < 8.2 < 8.2 1340 < 0.0332S/13E-30N02 4/9/2019 1000 50 64 4.6 140 56 190 480 0.011 J 0.14 J 0.15 0.12 < 0.01 < 0.004 0.14 J 190 < 8.2 < 8.2 1350 0.04 J32S/13E-30N02 1/9/2019 960 50 67 4.6 150 59 190 490 < 0.01 0.19 J 0.15 0.12 < 0.01 < 0.004 0.16 190 < 8.2 < 8.2 1360 < 0.0332S/13E-30N02 10/10/2018 940 50 75 4.9 150 64 190 500 < 0.01 0.16 J 0.16 0.069 < 0.01 < 0.004 0.086 J 190 < 8.2 < 8.2 1340 0.22 32S/13E-30N02 7/12/2018 1000 47 66 4.5 140 59 190 480 0.012 J 0.19 J 0.14 0.099 < 0.01 < 0.004 0.12 190 < 8.2 < 8.2 1390 0.17 32S/13E-30N02 4/11/2018 1100 46 76 4.9 160 65 190 480 < 0.01 0.15 J 0.16 0.097 < 0.01 0.0066 J 0.14 190 < 8.2 < 8.2 1350 0.41 32S/13E-30N02 1/11/2018 980 49 77 4.6 150 63 190 510 < 0.010.1 J 0.15 0.13 < 0.01 < 0.004 0.16 190 < 8.2 < 8.2 1330 0.2 32S/13E-30N02 10/10/2017 1000 46 70 4.8 160 65 200 510 < 0.01 0.19 J 0.17 0.11 < 0.01 0.0048 J 0.27 200 < 8.2 < 8.2 1340 0.28 32S/13E-30N02 7/11/2017 1100 49 74 4.8 150 64 190 480 < 0.01 0.13 J 0.15 0.08 < 0.01 0.023 0.16 190 < 8.2 < 8.2 1360 2 32S/13E-30N02 4/11/2017 980 50 74 4.8 160 64 190 510 < 0.01 0.12 J 0.14 0.14 < 0.01 < 0.004 0.18 190 < 8.2 < 8.2 1320 0.22 32S/13E-30N02 1/13/2017 980 49 80 5.1 170 69 200 490 < 0.01 0.12 J 0.16 0.078 < 0.01 0.011 0.16 200 < 8.2 < 8.2 1340 0.63 32S/13E-30N02 10/12/2016 1000 50 77 5 160 69 200 500 0.016 J < 0.088 0.15 0.11 < 0.01 < 0.004 0.27 200 < 8.2 < 8.2 1370 < 0.0332S/13E-30N02 7/19/2016 1000 48 78 5 160 68 200 500 —0.17 0.15 0.11 < 0.01 < 0.004 0.2 200 < 8.2 < 8.2 1350 < 0.0332S/13E-30N02 4/12/2016 1000 44 72 4.8 150 67 190 470 —< 0.08 0.14 0.096 < 0.01 < 0.004 0.21 190 < 8.2 < 8.2 1390 < 0.0332S/13E-30N02 1/13/2016 990 48 74 4.9 150 64 190 520 —0.12 0.14 0.22 < 0.01 < 0.004 < 0.046 190 < 8.2 < 8.2 1300 0.041 32S/13E-30N02 10/15/2015 1040 47 64 4.6 140 60 192 480 —< 1 0.13 0.18 < 0.01 < 0.005 < 0.1 192 < 10< 101350 < 0.0532S/13E-30N02 7/16/2015 1030 49 82 4.4 170 70 190 480 —1.52 0.15 < 0.1 < 0.01 < 0.005 0.11 190 < 10< 101360 < 0.0532S/13E-30N02 4/14/2015 840 47 61 4.3 130 58 190 500 —< 1 0.14 < 0.3 < 0.01 < 0.005 < 0.3 190 < 10< 101330 < 0.0532S/13E-30N02 1/14/2015 1050 50 62 4.2 140 59 190 520 —< 1 0.13 0.115 < 0.01 < 0.005 < 0.1 190 < 10< 101320 < 0.0532S/13E-30N02 10/15/2014 1040 44 65 5 140 58 200 440 —< 1 0.13 < 0.1 < 0.01 < 0.005 < 0.1 200 < 10< 101370 < 0.0532S/13E-30N02 7/30/2014 1020 45 66 4.6 140 60 220 470 —< 1 0.1 0.13 < 0.01 < 0.005 < 0.4 220 < 10< 101340 < 0.0532S/13E-30N02 4/16/2014 1040 46 66 5 120 50 190 520 —< 1 0.14 0.1 < 0.01 < 0.005 < 0.1 190 < 10< 101350 < 0.0532S/13E-30N02 1/15/2014 1060 45 60 4.1 120 49 190 477 —1.1 0.13 0.43 < 0.01 < 0.005 < 0.2 190 < 10< 101370 < 0.0532S/13E-30N02 10/15/2013 1030 46 70 4.9 140 58 190 541 —< 1 0.12 0.18 < 0.01 < 0.005 < 0.2 190 < 10< 101360 < 0.0532S/13E-30N02 7/10/2013 1020 50 61 4.5 140 59 185 500 —< 1 0.14 0.12 < 0.01 < 0.005 < 0.1 185 < 10< 101370 < 0.0532S/13E-30N02 4/10/2013 1080 48 60 4.3 120 52 185 500 —< 1 0.15 < 0.2 < 0.01 < 0.005 < 0.2 185 < 10< 101360 < 0.0532S/13E-30N02 1/14/2013 1010 48 63 4.5 120 53 188 530 —< 1 0.14 < 0.2 < 0.01 < 0.005 < 0.2 188 < 10< 101350 0.068 32S/13E-30N02 10/29/2012 1030 40 68 5 140 58 180 500 —< 1 0.14 < 0.5 < 0.01 < 0.005 < 0.5 180 < 10< 101360 < 0.0532S/13E-30N02 7/23/2012 1040 54 63 4.5 110 48 188 510 —< 1 0.15 0.15 < 0.01 0.01 < 0.1 188 < 10< 101360 < 0.0532S/13E-30N02 4/18/2012 990 60 56 4.2 110 47 190 560 —< 1 0.12 0.21 < 0.01 < 0.005 0.28 190 < 10< 101360 < 0.132S/13E-30N02 1/11/2012 1040 49 64 4.9 130 54 180 460 —< 1 0.17 0.16 < 0.02 < 0.005 < 0.2 180 < 10< 101360 < 0.132S/13E-30N02 11/21/2011 1020 46 57 4.5 130 54 180 450 —< 1 0.15 < 0.2 < 0.01 < 0.005 < 0.2 180 < 10< 101360 < 0.132S/13E-30N02 7/25/2011 1050 50.4 81 7.7 150 62 180 479.1 —< 1 0.16 0.144 < 0.01 0.006 < 0.1 180 < 5< 51370 0.49 32S/13E-30N02 4/20/2011 1030 52 63 5.4 130 44 180 508 —< 1 0.19 0.2 < 0.01 < 0.005 < 0.1 180 < 2< 21380 ND32S/13E-30N02 1/24/2011 1050 50 60 6.4 120 49 190 490 —< 1 0.17 0.17 < 0.1 0.064 < 0.1 190 < 2< 21380 0.12 32S/13E-30N02 10/21/2010 1040 48 52 3.5 100 45 181 460 —< 1 < 0.1 < 0.1 ND < 0.005 < 0.3 181 < 10< 101377 < 0.132S/13E-30N02 7/27/2010 777 57 67.6 7.31 141 58.5 190 470 —3.5 0.138 < 0.1 0.11 0.102 0.28 190 < 1< 11300 3.43 P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Quality.xlsx2/2/2024Page 289 of 306
Appendix A: NCMA Sentry Wells Water Level DataWell DateTotal Dissolved SolidsChloride Sodium Potassium Calcium MagnesiumAlkalinity, Bicarbonate (as CaCO3)Sulfate Nitrite (as N)Total Kjeldahl NitrogenBoron Fluoride Iodide Manganese BromideAlkalinity, Total (as CaCO3)Alkalinity, Carbonate (as CaCO3)Alkalinity, Hydroxide (as CaCO3)Specific ConductanceIron32S/13E-30N02 4/27/2010 800 93 71.9 12.5 108 46.3 159 300 —3.2 0.123 0.13 0.11 0.0776 0.7 159 < 1< 11100 3.27 32S/13E-30N02 2/25/2010 1010 74 76.9 10.2 141 58.1 195 490 —2.4 0.15 0.16 < 0.1 0.0579 0.24 195 < 1< 11400 3.3 32S/13E-30N02 1/26/2010 970 50 74.2 4.77 152 62.2 195 510 —< 0.5 0.129 0.11 < 0.1 < 0.005 0.16 195 < 1< 11300 < 0.132S/13E-30N02 10/20/2009 2080 690 274 151 239 101 220 400 —7 0.201 0.16 0.87 0.398 2 220 < 1< 12800 5.5 32S/13E-30N02 8/20/2009 1350 500 199 82.2 123 49 199 220 —6.3 ND 0.23 0.14 0.339 2.8 199 < 1< 12100 4.91 32S/13E-30N02 5/11/2009 1290 170 129 52 137 66.9 176 470 —ND ND 0.18 ND 0.128 0.56 176 < 1< 11800 5.24 32S/13E-30N02 3/27/1996 1050 50 71 5.5 145 60 243 516 —ND 0.23 ND ND ND NDNDNDNDND ND32S/13E-30N02 6/7/1976 1093 48 62 4.7 150 60 248 484 —ND 0.13 0.7 ND ND NDNDNDNDND ND32S/13E-30N02 1/21/1966 1069 54 71 5 148 63 232 483 —ND 0.12 0.5 ND ND NDNDNDNDND ND32S/13E-31H09 10/12/2023 770 40 44 2.7 110 50 350 170 < 0.02 < 0.41 0.06 J 0.16 0.028 0.038 0.16 350 < 3< 31000 0.28 32S/13E-31H09 7/6/2023 790 37 46 2.6 120 51 380 160 —< 0.41 < 0.046 0.21 0.028 0.044 0.15 380 < 3< 31100 0.39 32S/13E-31H09 4/13/2023 670 44 49 2.6 110 49 370 170 < 0.02 < 0.41 0.046 J 0.16 0.026 0.033 0.17 370 < 3< 31100 0.12 32S/13E-31H09 2/9/2023 670 43 46 2.6 110 50 370 170 < 0.02 < 0.41 0.063 J 0.15 0.035 0.034 0.17 370 < 3< 31000 0.048 32S/13E-31H09 10/5/2022 700 46 50 2.7 120 55 350 170 < 0.01 < 0.088 0.054 J 0.097 0.007 J 0.035 0.16 J 350 < 8.2 < 8.2 1050 0.11 32S/13E-31H09 7/12/2022 600 48 47 2.6 120 51 350 170 < 0.01 < 0.088 0.078 J 0.14 0.015 J 0.033 0.17 J 350 < 8.2 < 8.2 1100 0.062 32S/13E-31H09 4/7/2022 660 43 42 2.3 100 43 360 170 < 0.05< 0.2 0.088 J 0.11 0.016 J 0.029 0.13 J 360 < 8.2 < 8.2 1020 0.071 32S/13E-31H09 1/5/2022 710 43 45 2.4 110 49 360 170 < 0.05< 0.2 0.063 J 0.13 0.016 J 0.03 0.15 J 360 < 8.2 < 8.2 1060 0.064 32S/13E-31H09 10/5/2021 690 45 47 2.5 110 49 350 170 < 0.050.32 0.078 J 0.13 < 0.1 0.031 0.15 J 350 < 8.2 < 8.2 1050 < 0.0532S/13E-31H09 7/14/2021 620 45 47 2.5 110 50 360 170 < 0.050.23 0.068 J 0.13 0.016 J 0.032 0.18 J 360 < 8.2 < 8.2 1070 0.11 32S/13E-31H09 4/6/2021 650 45 45 2.3 110 48 360 170 < 0.01 0.14 J 0.07 J 0.13 0.012 J 0.034 0.19 J 360 < 8.2 < 8.2— 0.23 32S/13E-31H09 1/7/2021 600 46 48 2.6 110 51 350 170 < 0.010.43 0.071 0.14 0.018 0.037 0.2 350 < 8.2 < 8.2 1060 0.2 32S/13E-31H09 10/13/2020 670 46 46 2.5 110 47 350 170 < 0.01 < 0.088 0.074 J 0.13 0.017 J 0.033 0.17 J 350 < 8.2 < 8.2 1050 0.17 32S/13E-31H09 7/7/2020 780 44 49 2.6 120 53 370 170 < 0.01 < 0.088 0.07 J 0.11 0.018 J 0.037 0.13 J 370 < 8.2 < 8.2 1060 0.24 32S/13E-31H09 4/21/2020 620 42 48 2.7 120 50 380 170 < 0.01 0.19 J 0.066 J 0.16 0.018 J 0.038 0.14 J 380 < 8.2 < 8.2 1070 0.27 32S/13E-31H09 1/14/2020 670 44 50 2.8 130 52 350 170 < 0.01 0.11 J 0.077 J 0.13 0.021 J 0.043 0.16 J 350 < 8.2 < 8.2 1010 0.3 32S/13E-31H09 10/15/2019 670 43 51 2.7 120 50 360 170 < 0.01 0.099 J 0.074 J 0.11 0.016 J 0.038 0.16 J 360 < 8.2 < 8.2 1060 0.23 32S/13E-31H09 4/9/2019 620 43 44 2.5 110 50 360 170 < 0.01 0.11 J 0.077 J 0.14 0.013 J 0.033 0.14 J 360 < 8.2 < 8.2 1060 0.05 32S/13E-31H09 1/8/2019 690 44 44 2.6 110 52 370 170 < 0.01 0.11 J 0.075 J 0.16 0.018 J 0.035 0.15 370 < 8.2 < 8.2 1060 0.08 32S/13E-31H09 10/9/2018 690 42 46 2.7 110 54 360 170 < 0.01 0.15 J 0.067 J 0.11 0.017 J 0.035 0.094 J 360 < 8.2 < 8.2 1080 0.042 J32S/13E-31H09 7/10/2018 630 46 47 2.6 120 53 360 170 < 0.01 0.11 J 0.073 J 0.13 0.018 J 0.032 0.17 360 < 8.2 < 8.2 1100 0.041 J32S/13E-31H09 4/10/2018 700 44 45 2.5 110 51 360 170 < 0.01 0.11 J 0.068 J 0.13 0.016 J 0.035 0.17 360 < 8.2 < 8.2 1060 0.1 32S/13E-31H09 1/10/2018 680 40 46 2.6 120 53 360 160 < 0.01 0.14 J 0.062 J 0.16 0.019 J 0.048 0.14 360 < 8.2 < 8.2 1040 0.38 32S/13E-31H09 10/10/2017 640 40 47 2.6 120 55 370 160 < 0.01 0.12 J 0.079 J 0.13 0.016 J 0.046 0.13 370 < 8.2 < 8.2 1020 0.34 32S/13E-31H09 7/11/2017 750 40 48 2.8 120 56 360 170 < 0.01 < 0.088 0.075 J 0.11 0.015 J 0.057 0.15 360 < 8.2 < 8.2 1050 0.42 32S/13E-31H09 4/12/2017 620 42 52 3.1 130 60 360 170 < 0.01 < 0.088 0.082 J 0.17 0.017 J 0.05 0.14 360 < 8.2 < 8.2 1040 0.3 32S/13E-31H09 1/11/2017 640 61 53 3 100 48 320 150 < 0.01 < 0.088 0.071 J 0.16 0.02 J 0.05 0.24 320 < 4.1 < 4.1976 0.4 32S/13E-31H09 10/12/2016 720 46 49 2.8 120 56 370 170 0.019 J 0.18 J 0.069 J 0.12 0.021 J 0.041 0.18 370 < 8.2 < 8.2 1070 0.36 32S/13E-31H09 7/20/2016 680 45 50 2.9 120 56 370 160 —0.14 0.075 0.15 0.013 0.049 0.16 370 < 8.2 < 8.2 1060 0.33 32S/13E-31H09 4/13/2016 670 43 48 2.9 110 57 350 160 —0.2 0.062 0.14 0.012 0.056 0.18 350 < 8.2 < 8.2 1040 0.46 32S/13E-31H09 1/12/2016 630 48 48 2.8 110 54 350 180 —0.14 0.042 0.24 0.017 0.047 0.36 350 < 8.2 < 8.2 1100 0.46 32S/13E-31H09 10/14/2015 680 43 44 3.1 100 50 360 160 —< 1 0.089 0.28 0.02 0.033 < 0.1 360 < 10< 101060 0.18 32S/13E-31H09 7/15/2015 680 43 52 2.4 120 56 360 170 —< 1 0.079 0.11 0.01 0.033 < 0.1 360 < 10< 101070 0.13 32S/13E-31H09 4/16/2015 680 49 41 2.4 100 47 350 170 —< 1 0.068 0.114 < 0.01 0.039 < 0.1 350 < 10< 101030 0.47 32S/13E-31H09 10/16/2014 670 40 43 2.8 110 50 3500 150 —< 1 0.055 0.103 < 0.01 0.03 < 0.1 350 < 10< 101060 0.064 32S/13E-31H09 7/30/2014 670 43 43 2.2 110 48 360 160 —< 1 < 0.1 0.15 < 0.01 0.029 < 0.1 360 < 10< 101070 0.057 32S/13E-31H09 4/15/2014 680 42 43 3.3 87 43 340 170 —< 1 0.092 0.11 < 0.01 0.023 < 0.1 340 < 10< 101070 0.05 32S/13E-31H09 1/16/2014 680 45 42 2.6 100 46 360 171 —< 1 < 0.05 0.13 < 0.01 0.032 < 0.1 360 < 10< 101060 0.18 32S/13E-31H09 10/16/2013 670 40 44 2.6 100 47 350 180 —< 1 < 0.05 0.15 < 0.01 0.03 < 0.1 350 < 10< 101053 0.11 32S/13E-31H09 7/10/2013 670 44 43 2.8 110 52 350 180 —< 1 0.072 0.12 < 0.01 0.032 < 0.1 350 < 10< 101070 0.11 32S/13E-31H09 4/11/2013 720 43 40 2.7 98 46 350 170 —< 1 0.072 0.14 < 0.01 0.029 < 0.1 350 < 10< 101070 0.12 32S/13E-31H09 1/16/2013 660 43 43 2.7 100 47 360 180 —< 1 0.07 0.1 < 0.01 0.031 < 0.1 360 < 10< 101060 0.13 32S/13E-31H09 10/30/2012 660 40 44 2.9 110 49 345 170 —< 1 0.071 0.14 < 0.01 0.03 < 0.1 345 < 10< 101070 0.086 32S/13E-31H09 7/24/2012 700 47 44 2.8 93 45 356 180 —< 1 < 0.1 0.17 < 0.01 0.029 < 0.1 356 < 10< 101070 0.66 32S/13E-31H09 4/25/2012 680 48 44 2.7 95 43 350 200 —< 1 < 0.1 0.26 < 0.01 0.032 < 0.2 350 < 10< 101070 0.2 P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Quality.xlsx2/2/2024Page 290 of 306
Appendix A: NCMA Sentry Wells Water Level DataWell DateTotal Dissolved SolidsChloride Sodium Potassium Calcium MagnesiumAlkalinity, Bicarbonate (as CaCO3)Sulfate Nitrite (as N)Total Kjeldahl NitrogenBoron Fluoride Iodide Manganese BromideAlkalinity, Total (as CaCO3)Alkalinity, Carbonate (as CaCO3)Alkalinity, Hydroxide (as CaCO3)Specific ConductanceIron32S/13E-31H09 1/10/2012 460 67 61 2 35 17 81 120 < 0.01< 1 < 0.02 0.12 < 0.1 < 0.001 < 0.1 340 < 10< 10720 < 0.0232S/13E-31H09 11/22/2011 690 41 39 2.7 100 46 350 160 —< 1 0.046 < 0.2 0.013 0.03 < 0.2 350 < 10< 101010 0.029 32S/13E-31H09 7/25/2011 690 44 39 4.5 86 40 340 166.9 —< 1 < 0.1 0.145 < 0.01 0.026 < 0.1 340 < 5< 51070 < 0.1P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Quality.xlsx2/2/2024Page 291 of 306
Appendix A: NCMA Sentry Wells Water Level DataWell DateTotal Dissolved SolidsChloride Sodium Potassium Calcium MagnesiumAlkalinity, Bicarbonate (as CaCO3)Sulfate Nitrite (as N)Total Kjeldahl NitrogenBoron Fluoride Iodide Manganese BromideAlkalinity, Total (as CaCO3)Alkalinity, Carbonate (as CaCO3)Alkalinity, Hydroxide (as CaCO3)Specific ConductanceIron32S/13E-31H10 10/12/2023 710 34 39 3.1 110 51 330 160 < 0.039 < 0.41 0.074 J 0.22 0.019 0.17 0.14 330 < 3< 31000 4.4 32S/13E-31H10 7/6/2023 790 34 40 3 97 52 360 170 —< 0.41 0.051 J 0.24 0.013 0.19 0.13 360 < 3< 31000 5.9 32S/13E-31H10 4/13/2023 440 32 38 2.9 50 50 290 97 < 0.02 < 0.41 0.064 J 0.076 J 0.014 0.24 0.13 290 < 3< 3770 5.1 32S/13E-31H10 2/9/2023 410 31 36 3.3 39 51 270 82 < 0.099 < 0.41 0.055 J < 0.21 0.023 0.29 0.13 270 < 3< 3710 4.4 32S/13E-31H10 10/5/2022 660 34 38 2.7 110 58 350 160 < 0.01 0.12 J 0.048 J 0.18 0.0075 J 0.14 0.14 J 350 < 8.2 < 8.2 1020 4.7 32S/13E-31H10 7/12/2022 550 36 36 2.8 110 53 360 160 < 0.01 0.12 J 0.07 J 0.22 0.009 J 0.11 0.1 J 360 < 8.2 < 8.2 1060 4.2 32S/13E-31H10 4/7/2022 450 32 37 3.7 41 47 270 96 < 0.05 0.09 J 0.062 J 0.052 0.01 J 0.26 0.087 J 270 < 4.1 < 4.1737 4.5 32S/13E-31H10 1/4/2022 690 33 35 2.6 100 48 360 170 < 0.05< 0.2 0.059 J 0.18 0.009 J 0.12 0.11 J 360 < 8.2 < 8.2 1020 3.9 32S/13E-31H10 10/5/2021 630 34 36 2.7 110 52 360 160 < 0.050.21 0.067 J 0.21 0.0083 J 0.12 0.12 J 360 < 8.2 < 8.2 1020 4.5 32S/13E-31H10 7/14/2021 580 34 37 2.7 110 52 360 160 < 0.050.4 0.055 J 0.19 0.0086 J 0.15 0.13 J 360 < 8.2 < 8.2 1020 5.6 32S/13E-31H10 4/6/2021 480 36 41 3.1 31 52 250 93 < 0.01 0.17 J 0.062 J 0.055 0.011 J 0.18 0.16 J 250 < 4.1 < 4.1—2 32S/13E-31H10 1/6/2021 380 37 51 7.2 13 47 210 61 < 0.010.48 0.082 0.048 0.016 0.1 0.16 220 11 < 4.1614 1.3 32S/13E-31H10 10/8/2020 660 33 35 2.6 97 47 350 150 < 0.010.23 0.079 J 0.18 0.0081 J 0.14 0.12 J 350 < 4.1 < 4.1965 4.8 32S/13E-31H10 7/7/2020 510 42 51 5 27 48 220 99 < 0.010.1 J 0.084 J 0.052 0.022 J 0.17 0.2 220 < 4.1 < 4.1720 1.9 32S/13E-31H10 4/21/2020 430 38 50 5.3 21 44 220 73 < 0.010.28 0.068 J 0.055 0.02 J 0.13 0.14 J 220 < 4.1 < 4.1669 1.9 32S/13E-31H10 1/14/2020 520 36 42 3.7 80 51 310 130 < 0.01 0.11 J 0.077 J 0.16 0.014 J 0.2 0.092 J 310 < 4.1 < 4.1843 4.4 32S/13E-31H10 10/14/2019 630 34 42 3.9 110 52 350 150 < 0.01 < 0.067 0.075 J 0.14 < 0.01 0.2 < 0.076 350 < 4.1 < 4.1974 6.6 32S/13E-31H10 7/9/2019 890 44 50 3.4 110 57 320 200 < 0.010.24 0.092 J 0.18 0.026 J 0.21 0.19 J 320 < 8.2 < 8.2 1030 6 32S/13E-31H10 4/9/2019 630 43 48 3.4 100 50 320 200 < 0.01 0.17 J 0.099 J 0.21 0.015 J 0.18 0.15 J 320 < 8.2 < 8.2 1040 4.8 32S/13E-31H10 1/8/2019 620 35 41 3.3 100 54 340 160 < 0.01 0.17 J 0.081 J 0.18 0.012 J 0.16 0.14 340 < 4.1 < 4.1973 5.6 32S/13E-31H10 10/9/2018 590 33 45 5.3 88 54 330 120 < 0.010.2 0.075 J 0.11 0.011 J 0.16 0.077 J 330 < 4.1 < 4.1916 6.5 32S/13E-31H10 7/12/2018 510 34 46 6 45 54 300 96 0.013 J 0.23 0.08 J 0.12 0.012 J 0.12 0.16 300 < 4.1 < 4.1846 3.8 32S/13E-31H10 4/10/2018 690 41 51 3.5 120 55 310 200 < 0.01 0.16 J 0.089 J 0.19 0.016 J 0.21 0.15 310 < 8.2 < 8.2 1020 4.7 32S/13E-31H10 1/10/2018 660 35 44 3.3 110 56 350 170 < 0.010.23 0.075 J 0.2 0.016 J 0.2 0.17 350 < 8.2 < 8.2 1020 5.3 32S/13E-31H10 10/10/2017 640 33 41 3.1 120 57 360 160 < 0.010.38 0.083 J 0.18 < 0.01 0.21 0.13 450 89 < 8.2 1070 4.3 32S/13E-31H10 7/11/2017 700 36 48 3.8 120 60 350 170 < 0.01 0.17 J 0.09 J 0.15 0.011 J 0.17 0.13 350 < 8.2 < 8.2 1020 4.7 32S/13E-31H10 4/12/2017 600 39 47 3.4 120 62 340 190 < 0.01 < 0.088 0.09 J 0.19 0.013 J 0.19 0.22 340 < 8.2 < 8.2 1020 5.2 32S/13E-31H10 1/13/2017 670 34 45 3.4 130 60 370 180 < 0.01 0.16 J 0.076 J 0.17 0.014 J 0.22 0.1 370 < 8.2 < 8.2 1020 7.8 32S/13E-31H10 10/12/2016 700 33 40 3.2 120 59 380 170 0.045 J 0.22 0.062 J 0.18 0.012 J 0.15 0.12 380 < 8.2 < 8.2 1040 5.3 32S/13E-31H10 7/20/2016 630 33 42 4.4 99 57 370 150 —0.3 0.068 0.14 < 0.01 0.19 0.14 370 < 8.2 < 8.2991 8.9 32S/13E-31H10 4/13/2016 670 37 46 3.4 120 57 350 180 —0.21 0.078 0.19 0.011 0.23 0.14 350 < 8.2 < 8.2 1030 6.7 32S/13E-31H10 1/13/2016 380 37 49 9.9 6.8 46 170 54 —0.43 0.044 0.088 0.014 0.084 0.19 210 34 < 4.1603 2.2 32S/13E-31H10 10/14/2015 320 32 33 2.7 17 48 216 68 —< 1 0.089 0.12 0.016 0.098 < 0.1 227 11 < 10600 1.4 32S/13E-31H10 7/15/2015 330 34 44 3.4 15 54 195 81 —< 1 0.082 < 0.1 < 0.01 0.081 < 0.1 213 18 < 10610 0.98 32S/13E-31H10 4/16/2015 660 35 33 2.7 99 48 360 170 —< 1 0.083 0.163 < 0.01 0.17 < 0.1 360 < 10< 101000 4.6 32S/13E-31H10 1/14/2015 760 55 56 3 110 50 300 250 —< 1 0.11 0.159 0.021 0.17 < 0.1 300 < 10< 101070 4.2 32S/13E-31H10 10/16/2014 720 41 46 3.7 110 53 330 200 —< 1 0.1 < 0.1 < 0.01 0.17 < 0.1 330 < 10< 101090 6.5 32S/13E-31H10 7/30/2014 660 34 35 2.4 95 49 420 160 —< 1 < 0.1 0.16 < 0.01 0.17 < 0.1 420 < 10< 101040 6.5 32S/13E-31H10 4/17/2014 890 55 70 5.4 100 45 250 380 —< 1 0.15 0.12 0.01 0.31 0.13 250 < 10< 101260 4.9 32S/13E-31H10 1/16/2014 900 57 66 4.6 110 50 240 360 —< 1 0.18 0.2 0.02 0.32 < 0.1 240 < 10< 101260 6 32S/13E-31H10 10/16/2013 690 30 40 3.4 100 49 340 190 —< 1 0.091 0.14 < 0.01 0.23 < 0.1 340 < 10< 101050 7.4 32S/13E-31H10 7/11/2013 860 60 50 4.4 110 47 240 340 —< 1 0.18 0.15 0.02 0.28 < 0.1 240 < 10< 101230 4.9 32S/13E-31H10 4/11/2013 900 60 69 4.6 110 47 250 350 —< 1 0.2 0.12 0.03 0.28 < 0.2 250 < 10< 101250 5.7 32S/13E-31H10 1/16/2013 820 66 76 5 100 47 260 320 —< 1 0.21 0.13 < 0.01 0.31 < 0.2 260 < 10< 101230 4.2 32S/13E-31H10 10/30/2012 780 65 75 4.7 100 46 255 280 —< 1 0.19 0.14 0.04 0.23 < 0.1 255 < 10< 101190 4 32S/13E-31H10 7/25/2012 830 76 80 5.3 96 45 250 310 —< 1 0.22 0.15 0.04 0.24 < 0.1 250 < 10< 101220 6.7 32S/13E-31H10 4/19/2012 790 87 69 4.5 52 37 250 270 —< 1 0.19 0.21 0.05 0.17 < 0.2 250 < 10< 101180 4 32S/13E-31H10 1/12/2012 760 76 85 4 79 40 270 190 —< 1 0.23 0.21 0.069 0.23 < 0.2 270 < 10< 101150 4.8 32S/13E-31H10 11/21/2011 720 39 38 3.4 96 43 320 180 —3.5 0.079 0.19 0.013 0.17 < 0.1 320 < 10< 101050 4.8 32S/13E-31H10 7/25/2011 760 69.3 66 6.4 80 35 310 208.8 —< 1 0.16 0.17 0.041 0.23 0.199 310 < 5< 51170 5.3 32S/13E-31H10 1/24/2011 310 98 22 8.1 34 9.2 19 53 —< 1 < 0.1 0.2 4.42 0.4 0.63 19 < 2< 2480 10 32S/13E-31H10 10/28/2010 290 81 26 9.3 64 11 160 68 —< 1 < 0.1 0.2 ND 0.85 0.36 160 < 10< 10520 38 32S/13E-31H10 7/26/2010 438 85 34.3 1.93 61.7 30.4 30 210 —< 0.5 0.0435 0.58 0.22 1.46 0.32 30 < 1< 1690 35.5 32S/13E-31H10 4/26/2010 560 83 47.7 5.7 86.1 48.3 62 310 —0.84 < 0.02 < 0.1 0.56 2.54 0.31 62 < 1< 1880 233 P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Quality.xlsx2/2/2024Page 292 of 306
Appendix A: NCMA Sentry Wells Water Level DataWell DateTotal Dissolved SolidsChloride Sodium Potassium Calcium MagnesiumAlkalinity, Bicarbonate (as CaCO3)Sulfate Nitrite (as N)Total Kjeldahl NitrogenBoron Fluoride Iodide Manganese BromideAlkalinity, Total (as CaCO3)Alkalinity, Carbonate (as CaCO3)Alkalinity, Hydroxide (as CaCO3)Specific ConductanceIron32S/13E-31H10 1/27/2010 460 130 45 25.4 682 124 112 100 —ND < 0.02 0.21 0.25 32.4 0.49 112 < 1< 1760 4360 32S/13E-31H10 10/20/2009 362 92 39.6 2.92 19.2 45.1 76.8 110 —< 0.5 0.0697 < 0.1 < 0.1 0.242 0.39 80 3.2 < 1590 11.4 32S/13E-31H10 8/19/2009 420 160 48.4 3.37 49.9 20.4 17.6 54 —1.1 ND < 0.1 0.25 1.76 0.68 17.6 < 1< 1690 242 32S/13E-31H10 5/16/1983 665 35 40 ND 85 65 360 90 —ND ND 0.2 ND 0.01 ND360 NDND950 0.1 P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Quality.xlsx2/2/2024Page 293 of 306
Appendix A: NCMA Sentry Wells Water Level DataWell DateTotal Dissolved SolidsChloride Sodium Potassium Calcium MagnesiumAlkalinity, Bicarbonate (as CaCO3)Sulfate Nitrite (as N)Total Kjeldahl NitrogenBoron Fluoride Iodide Manganese BromideAlkalinity, Total (as CaCO3)Alkalinity, Carbonate (as CaCO3)Alkalinity, Hydroxide (as CaCO3)Specific ConductanceIron32S/13E-31H11 10/12/2023 830 40 45 3.3 120 51 370 200 < 0.039 < 0.41 0.089 J 0.21 0.027 0.21 0.16 370 < 3< 31100 6.7 32S/13E-31H11 7/6/2023 820 36 47 3.3 120 52 340 190 —< 0.41 0.067 J 0.21 0.02 0.21 0.15 340 < 3< 31100 6.7 32S/13E-31H11 4/13/2023 440 36 42 3.2 46 50 260 130 < 0.02 < 0.41 0.055 J 0.064 J 0.018 0.3 0.14 260 < 3< 3820 7.3 32S/13E-31H11 2/9/2023 720 50 43 3.4 120 52 340 200 < 0.099 < 0.41 0.068 J < 0.21 0.027 0.19 0.14 340 < 3< 31000 6 32S/13E-31H11 10/5/2022 700 36 44 3.2 120 55 340 200 < 0.01 0.092 J 0.06 J 0.17 0.0086 J 0.19 0.15 J 340 < 8.2 < 8.2 1060 5.5 32S/13E-31H11 7/12/2022 560 39 40 3 110 51 340 200 < 0.01 < 0.088 0.081 J 0.2 0.011 J 0.18 0.14 J 340 < 8.2 < 8.2 1100 5.4 32S/13E-31H11 4/7/2022 700 44 47 3.1 110 46 330 220 < 0.05 0.16 J 0.093 J 0.15 0.024 J 0.19 0.12 J 330 < 8.2 < 8.2 1060 4.8 32S/13E-31H11 1/4/2022 710 45 47 3.2 110 51 330 200 < 0.05 0.097 J 0.088 J 0.18 0.024 J 0.2 0.16 J 330 < 8.2 < 8.2 1070 5.6 32S/13E-31H11 10/5/2021 680 37 44 3.3 120 53 340 200 0.025 J0.2 0.08 J 0.19 0.0089 J 0.23 0.12 J 340 < 8.2 < 8.2 1060 5.1 32S/13E-31H11 7/14/2021 640 37 41 3 110 50 350 210 < 0.05 0.13 J 0.06 J 0.19 0.012 J 0.22 0.15 J 350 < 8.2 < 8.2 1070 4.8 32S/13E-31H11 4/6/2021 680 37 42 3 110 49 340 210 < 0.01 0.15 J 0.072 J 0.2 0.011 J 0.2 0.15 J 340 < 8.2 < 8.2— 4.6 32S/13E-31H11 1/6/2021 620 38 47 3.5 120 55 340 210 < 0.010.49 0.087 0.2 0.015 0.22 0.18 340 < 8.2 < 8.2 1050 4.9 32S/13E-31H11 10/8/2020 680 37 41 3.6 110 55 330 200 < 0.01 0.13 J 0.085 J 0.21 < 0.005 0.22 0.12 J 330 < 8.2 < 8.2 1020 11 32S/13E-31H11 7/7/2020 410 62 69 5.2 3.1 41 140 57 < 0.01 < 0.088 0.11 0.056 0.051 J 0.024 0.32 170 36 < 4.1636 0.9 32S/13E-31H11 4/21/2020 450 60 59 4.4 5.1 45 170 85 < 0.010.21 0.099 J 0.068 0.054 J 0.044 0.26 180 14 < 4.1698 0.73 32S/13E-31H11 1/14/2020 680 73 76 3.6 110 44 300 210 < 0.01 0.11 J 0.17 0.2 0.075 J 0.18 0.26 300 < 8.2 < 8.2 1070 3.8 32S/13E-31H11 10/14/2019 750 48 56 3.7 120 50 320 200 < 0.01 < 0.067 0.11 0.16 0.027 J 0.24 0.15 J 320 < 8.2 < 8.2 1070 5.7 32S/13E-31H11 7/9/2019 880 61 73 4 110 52 310 210 < 0.01 0.17 J 0.16 0.17 0.054 J 0.24 0.28 310 < 8.2 < 8.2 1110 5.9 32S/13E-31H11 4/9/2019 700 61 66 3.7 110 48 300 240 < 0.01 0.18 J 0.14 0.2 0.041 J 0.19 0.27 300 < 8.2 < 8.2 1140 3.7 32S/13E-31H11 1/8/2019 730 39 45 3.6 120 52 340 220 < 0.01 0.14 J 0.087 J 0.18 0.016 J 0.24 0.13 340 < 8.2 < 8.2 1090 8.2 32S/13E-31H11 10/9/2018 720 37 49 3.8 130 59 340 210 < 0.010.24 0.091 J 0.15 0.015 J 0.23 0.077 J 340 < 8.2 < 8.2 1090 8.2 32S/13E-31H11 7/12/2018 720 36 43 3.6 120 54 340 190 0.012 J 0.27 0.082 J 0.17 0.014 J 0.25 0.15 340 < 8.2 < 8.2 1110 7.2 32S/13E-31H11 4/10/2018 780 73 81 3.8 110 47 300 210 < 0.01 0.09 J 0.17 0.18 0.066 J 0.24 0.4 300 < 8.2 < 8.2 1130 7.3 32S/13E-31H11 1/10/2018 750 39 51 3.7 130 57 340 220 < 0.01 0.17 J 0.089 J 0.2 0.021 J 0.28 0.16 340 < 8.2 < 8.2 1090 5.9 32S/13E-31H11 10/10/2017 720 38 45 3.7 120 56 350 200 < 0.010.22 0.13 0.18 0.015 J 0.22 0.14 350 < 8.2 < 8.2 1080 5.6 32S/13E-31H11 7/11/2017 820 43 53 3.9 130 58 320 230 < 0.01 0.11 J 0.11 0.13 0.018 J 0.29 0.19 320 < 8.2 < 8.2 1110 9.7 32S/13E-31H11 4/12/2017 720 45 53 3.8 120 56 320 250 < 0.01 < 0.088 0.11 0.17 0.022 J 0.25 0.18 320 < 8.2 < 8.2 1100 6.3 32S/13E-31H11 1/13/2017 750 44 57 4 130 58 340 240 < 0.01 0.11 J 0.11 0.13 0.024 J 0.29 0.15 340 < 8.2 < 8.2 1100 7.2 32S/13E-31H11 10/12/2016 780 41 49 3.9 120 57 350 220 0.014 J 0.12 J 0.097 J 0.16 0.021 J 0.28 0.16 350 < 8.2 < 8.2 1100 8.1 32S/13E-31H11 7/20/2016 420 120 64 6.8 4.3 38 60 39 —0.097 0.12 0.059 0.084 0.084 0.59 89 29 < 4.1617 9 32S/13E-31H11 4/13/2016 410 110 64 604 3.9 40 51 56 —< 0.08 0.11 0.058 0.084 0.053 0.58 92 41 < 4.1628 6.7 32S/13E-31H11 1/13/2016 450 120 70 7.7 4.5 36 49 65 —< 0.08 0.11 0.095 0.11 0.072 0.76 86 37 < 4.1675 8.6 32S/13E-31H11 10/14/2015 350 110 69 9.2 3.7 31 42 74 —< 1 0.16 < 0.1 0.099 0.036 0.44 75 33 < 10670 5.7 32S/13E-31H11 7/15/2015 380 120 85 11 4.3 35 40 85 —< 1 0.19 < 0.1 0.1 0.05 0.409 65 25 < 10690 9.6 32S/13E-31H11 4/16/2015 400 120 66 7.6 4.9 36 54 100 —< 1 0.17 < 0.1 0.088 0.039 0.481 76 22 < 10700 6.6 32S/13E-31H11 1/14/2015 420 125 68 7 6.4 37 45 126 —< 1 0.15 < 0.1 0.097 0.038 0.385 65 20 < 10720 3.5 32S/13E-31H11 10/16/2014 370 120 78 13 4.2 29 53 77 —< 1 0.17 < 0.1 0.11 0.04 0.35 88 < 10< 10740 4.5 32S/13E-31H11 7/30/2014 450 120 71 4.4 9.6 43 53 130 —< 1 0.15 0.12 0.1 0.078 0.29 73 20 < 10800 8 32S/13E-31H11 4/17/2014 370 120 89 14 2.4 17 76 39 —< 1 0.16 < 0.1 0.12 0.03 0.43 121 45 < 10720 3.7 32S/13E-31H11 1/16/2014 350 122 89 15 2 18 67.5 42 —< 1 0.17 0.1 0.09 0.026 0.48 125 57.5 < 10710 2.3 32S/13E-31H11 10/16/2013 360 100 98 20 3.1 15 66 36 —< 1 0.19 < 0.1 0.11 0.057 0.38 139 73 < 10710 4.1 32S/13E-31H11 7/11/2013 370 140 70 6.3 4 23 82 40 —< 1 0.2 0.11 0.11 0.043 0.44 117 35 < 10730 3.2 32S/13E-31H11 4/11/2013 340 90 81 14 2.9 18 77.5 30 —< 1 0.19 0.12 0.07 0.046 0.3 155 77.5 < 10650 3.2 32S/13E-31H11 1/16/2013 360 107 99 7.1 3.3 24 110 36 —< 1 0.25 < 0.1 < 0.01 0.048 0.4 165 55 < 10720 3.7 32S/13E-31H11 10/30/2012 380 97 100 6.4 4.5 24 130 38 —< 1 0.28 < 0.1 0.1 0.09 0.2 168 38 < 10720 6.1 32S/13E-31H11 7/25/2012 240 49 56 11 5.4 22 99 43 —< 1 0.16 0.19 0.023 0.11 < 0.1 132 33 < 10470 6.6 32S/13E-31H11 4/19/2012 380 100 87 5.5 3.5 26 150 79 —< 1 0.27 0.26 0.09 0.033 0.68 180 30 < 10750 1.6 32S/13E-31H11 1/12/2012 480 96 110 4.9 5.6 33 154 95 —< 1 0.28 < 0.2 0.11 0.01 0.306 180 26 < 10850 0.19 32S/13E-31H11 11/21/2011 390 90 78 4.6 5.2 24 111 86 —< 1 0.19 0.13 0.092 0.014 0.28 128 17 < 10720 0.5 32S/13E-31H11 7/25/2011 260 29.3 23 5.3 8.7 20 84 80 —< 1 < 0.1 0.199 0.072 0.041 < 0.1 89 < 5< 5440 2.7 32S/13E-31H11 4/21/2011 580 118 70 19 49 17 8.8 274 —< 1 < 0.1 0.29 0.109 0.091 0.4 11.3 2.5 < 2950 ND32S/13E-31H11 1/24/2011 680 110 60 17 64 22 5 330 —< 1 < 0.1 0.22 0.96 0.16 0.31 11.2 6.2 < 21040 10 32S/13E-31H11 10/21/2010 770 100 68 12 88 31 14 380 —< 1 < 0.1 0.28 ND 0.054 < 0.3 14 < 10< 101163 2.2 32S/13E-31H11 7/26/2010 783 130 80.1 8.58 142 42 2.8 450 —< 0.5 < 0.02 0.26 0.31 3.97 0.77 2.8 < 1< 11200 593 P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Quality.xlsx2/2/2024Page 294 of 306
Appendix A: NCMA Sentry Wells Water Level DataWell DateTotal Dissolved SolidsChloride Sodium Potassium Calcium MagnesiumAlkalinity, Bicarbonate (as CaCO3)Sulfate Nitrite (as N)Total Kjeldahl NitrogenBoron Fluoride Iodide Manganese BromideAlkalinity, Total (as CaCO3)Alkalinity, Carbonate (as CaCO3)Alkalinity, Hydroxide (as CaCO3)Specific ConductanceIron32S/13E-31H11 4/26/2010 1130 160 70.2 6.48 208 50.7 8.4 530 —0.56 < 0.02 0.23 0.54 3.1 0.97 8.4 < 1< 11600 383 32S/13E-31H11 1/27/2010 1740 430 55.6 4.98 282 43 < 1 680 —< 0.5 0.0819 0.14 0.41 9.41 2 < 1< 1< 12300 170 32S/13E-31H11 10/20/2009 2250 1000 19.5 2.4 487 22.5 5 410 —0.98 0.0532 0.13 < 0.1 13.1 4.5 5 < 1< 13100 236 32S/13E-31H11 8/19/2009 322 150 93.2 16.7 23.9 12.1 3 4 —1.3 ND 0.19 0.5 0.71 0.74 23 20 < 1640 153 32S/13E-31H11 5/16/1983 840 80 90 ND 100 50 250 160 —ND ND 0.2 ND 0.14 ND250 NDND1200 0.1 P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Quality.xlsx2/2/2024Page 295 of 306
Appendix A: NCMA Sentry Wells Water Level DataWell DateTotal Dissolved SolidsChloride Sodium Potassium Calcium MagnesiumAlkalinity, Bicarbonate (as CaCO3)Sulfate Nitrite (as N)Total Kjeldahl NitrogenBoron Fluoride Iodide Manganese BromideAlkalinity, Total (as CaCO3)Alkalinity, Carbonate (as CaCO3)Alkalinity, Hydroxide (as CaCO3)Specific ConductanceIron32S/13E-31H12 4/21/2011 410 97 100 7.2 3.5 21 80 134 —< 1 0.23 0.18 0.097 0.065 0.42 100 20 < 2770 ND32S/13E-31H12 1/24/2011 440 92 90 9.2 3.4 27 90 140 —< 1 0.25 0.11 0.94 0.041 0.35 110 20 < 2810 2.2 32S/13E-31H12 10/21/2010 460 90 110 15 6.8 32 94 140 —< 1 0.2 0.1 ND 0.1 0.38 124 30 < 10868 3.5 32S/13E-31H12 7/26/2010 478 83 109 5.94 52.9 30.4 122 94 —< 0.5 0.255 < 0.1 0.41 0.477 0.56 130 8 < 1730 61 32S/13E-31H12 4/26/2010 452 83 83 7.42 29.3 34.5 72 190 —0.56 0.134 < 0.1 0.65 0.702 0.4 86 14 < 1810 71 32S/13E-31H12 1/27/2010 496 71 92.2 10.6 22.9 39.1 13 230 —< 0.5 0.323 < 0.1 0.2 0.604 0.29 51 38 < 1780 54.4 32S/13E-31H12 10/20/2009 564 71 80.8 8.63 33.2 49.8 49.6 310 —< 0.5 0.148 < 0.1 < 0.1 0.337 0.32 64 14.4 < 1850 20 32S/13E-31H12 8/19/2009 522 180 148 71.6 95.2 8.42 30 3.5 —1.7 ND 0.24 0.52 2.36 0.76 170 140 < 11000 278 32S/13E-31H12 5/16/1983 630 40 40 ND 90 50 330 80 —ND ND 0.1 ND 0.02 ND330 NDND900 0.05 P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Quality.xlsx2/2/2024Page 296 of 306
Appendix A: NCMA Sentry Wells Water Level DataWell DateTotal Dissolved SolidsChloride Sodium Potassium Calcium MagnesiumAlkalinity, Bicarbonate (as CaCO3)Sulfate Nitrite (as N)Total Kjeldahl NitrogenBoron Fluoride Iodide Manganese BromideAlkalinity, Total (as CaCO3)Alkalinity, Carbonate (as CaCO3)Alkalinity, Hydroxide (as CaCO3)Specific ConductanceIron32S/13E-31H13 2/16/2022 710 40 42 3.1 110 48 340 220 < 0.05 0.17 J 0.077 J 0.19 — 0.2 0.2 340 < 8.2 < 8.2 1080 4.1 32S/13E-31H13 1/4/2022 730 39 42 3 110 50 350 200 < 0.05< 0.2 0.081 J 0.18 0.014 J 0.17 0.14 J 350 < 8.2 < 8.2 1060 3.9 32S/13E-31H13 10/5/2021 500 100 83 3.8 11 43 200 41 < 0.05 0.11 J 0.17 0.067 0.051 J 0.22 0.33 210 8.4 < 4.1772 0.5 32S/13E-31H13 7/14/2021 490 99 85 3.6 13 35 210 29 < 0.05< 0.2 0.16 0.059 0.049 J 0.13 0.34 220 9 < 4.1760 0.76 32S/13E-31H13 4/6/2021 430 110 97 4.2 2.9 28 170 0.52 J < 0.01 < 0.088 0.19 0.066 0.056 J 0.061 0.36 210 38 < 4.1— 0.16 32S/13E-31H13 1/6/2021 480 110 98 4.4 3 28 170 0.48 < 0.010.3 0.21 0.054 0.063 0.063 0.35 210 33 < 4.1678 0.18 32S/13E-31H13 10/8/2020 530 100 98 4.3 3.8 31 180 0.45 J < 0.01 < 0.088 0.22 0.063 0.059 J 0.074 0.32 210 32 < 4.1685 0.94 32S/13E-31H13 7/7/2020 500 110 100 4.4 3.2 29 180 2.1 < 0.01 < 0.088 0.21 0.054 0.069 J 0.052 0.35 200 25 < 4.1729 0.2 32S/13E-31H13 4/21/2020 470 100 100 4.8 2.6 30 180 0.4 J < 0.01 0.076 J 0.2 0.064 0.079 J 0.048 0.36 220 37 < 4.1721 0.43 32S/13E-31H13 1/14/2020 430 120 110 4.6 3.3 29 190 9.5 < 0.01 < 0.067 0.25 0.084 0.094 J 0.054 0.28 220 35 < 4.1730 0.44 32S/13E-31H13 10/14/2019 280 99 93 4.7 2.7 32 180 0.58 J < 0.01 < 0.067 0.18 0.064 0.066 J 0.054 0.3 210 37 < 4.1675 0.34 32S/13E-31H13 7/9/2019 500 90 83 4.7 3.7 36 170 0.56 J < 0.01 0.079 J 0.16 0.062 0.059 J 0.078 0.35 200 26 < 4.1654 2.9 32S/13E-31H13 4/9/2019 460 100 79 4 3.8 34 180 7.5 < 0.01 0.052 J 0.18 0.075 0.055 J 0.069 0.31 210 27 < 4.1690 2.1 32S/13E-31H13 1/8/2019 400 99 79 4.3 6.7 42 180 19 < 0.01 0.06 J 0.17 0.057 0.057 J 0.13 0.29 200 19 < 4.1703 2.2 32S/13E-31H13 10/9/2018 400 84 79 4.2 4.9 43 190 13 < 0.01 0.052 J 0.16 0.043 J 0.045 J 0.083 0.18 220 23 < 4.1678 2.1 32S/13E-31H13 7/12/2018 470 81 72 3.9 3.9 38 190 13 0.012 J 0.096 J 0.14 0.041 J 0.045 J 0.064 0.31 220 25 < 4.1699 0.86 32S/13E-31H13 4/10/2018 490 82 78 3.8 4.5 44 190 20 < 0.01 < 0.084 0.14 0.039 J 0.041 J 0.083 0.3 220 30 < 4.1676 4.2 32S/13E-31H13 1/10/2018 430 75 75 3.8 4.3 38 190 7.2 < 0.01 < 0.084 0.14 0.05 0.046 J 0.07 0.25 210 26 < 4.1626 2.5 32S/13E-31H13 10/10/2017 390 77 70 3.7 4.9 38 190 15 < 0.01 0.11 J 0.16 0.034 J 0.039 J 0.079 0.28 220 29 < 4.1648 1.1 32S/13E-31H13 7/11/2017 390 76 80 3.9 7.8 45 190 30 < 0.01 < 0.088 0.15 0.033 J 0.036 J 0.13 0.28 210 19 < 4.1680 2.2 32S/13E-31H13 4/12/2017 430 79 87 4.4 4 44 180 21 < 0.01 0.13 J 0.17 0.024 J 0.043 J 0.077 0.28 220 40 < 4.1667 4.5 32S/13E-31H13 1/13/2017 480 81 95 4.7 3.9 41 190 14 < 0.01 < 0.088 0.19 0.037 J 0.056 J 0.065 0.31 220 33 < 4.1652 3.3 32S/13E-31H13 10/12/2016 410 80 87 4.3 4.2 43 190 22 0.015 J < 0.088 0.18 0.04 J 0.055 J 0.072 0.29 220 33 < 4.1678 2.3 32S/13E-31H13 7/20/2016 510 91 99 5.1 2.4 34 170 19 —< 0.08 0.22 0.043 0.054 0.038 0.43 210 44 < 4.1694 1.2 32S/13E-31H13 4/13/2016 450 94 99 4.6 2.5 33 150 25 —< 0.08 0.22 0.054 0.045 0.035 0.44 200 51 < 4.1701 1.2 32S/13E-31H13 1/13/2016 460 99 97 4.8 2.6 32 150 30 —< 0.08 0.19 0.084 < 0.01 0.038 0.53 190 43 < 4.1717 0.33 32S/13E-31H13 10/14/2015 370 85 91 4.8 3.1 32 159 45 —< 1 0.23 < 0.1 0.06 0.043 0.26 189 30 < 10710 0.3 32S/13E-31H13 7/15/2015 390 90 99 4.4 2.7 34 145 55 —< 1 0.21 < 0.1 0.06 0.034 0.24 185 40 < 10730 0.24 32S/13E-31H13 4/16/2015 360 89 86 4.8 2.6 31 137 58 —< 1 0.2 < 0.1 0.057 0.03 0.266 172 35 < 10680 0.42 32S/13E-31H13 1/14/2015 390 90 84 4.8 2 31 140 61 —< 1 0.18 < 0.1 0.059 0.035 0.235 170 30 < 10670 0.47 32S/13E-31H13 10/16/2014 370 80 84 5 3.2 32 146 59 —< 1 0.19 < 0.1 0.055 0.044 0.18 170 24 < 10720 0.61 32S/13E-31H13 7/30/2014 380 86 81 4.2 3.6 35 158 61 —< 1 0.16 < 0.1 0.05 0.047 0.17 175 17 < 10730 0.25 32S/13E-31H13 4/17/2014 380 84 86 5.2 3 26 120 87 —< 1 0.18 < 0.1 0.08 0.032 0.3 143 23 < 10730 0.45 32S/13E-31H13 1/16/2014 390 89 91 5 4.1 34 119 103 —< 1 0.2 < 0.1 0.06 0.043 0.34 136 17 < 10740 0.3 32S/13E-31H13 10/16/2013 410 84 87 4.7 5.3 33 114 130 —< 1 0.17 < 0.1 0.08 0.053 0.3 124 10 < 10760 0.28 32S/13E-31H13 7/11/2013 420 80 70 4.8 4.5 35 116 120 —< 1 0.19 < 0.1 0.06 0.047 0.21 136 20 < 10760 0.19 32S/13E-31H13 4/11/2013 450 77 77 4.7 5.8 38 113 150 —< 1 0.19 < 0.1 0.06 0.069 0.2 128 15 < 10780 0.15 32S/13E-31H13 1/15/2013 420 74 78 4.7 7 40 110 180 —< 1 0.18 < 0.1 < 0.01 0.087 < 0.1 125 15 < 10810 0.55 32S/13E-31H13 10/30/2012 380 88 99 5.7 3.3 30 160 63 —< 1 0.25 < 0.1 0.08 0.035 0.3 168 7.5 < 10740 0.33 32S/13E-31H13 7/25/2012 390 108 107 5.5 2.7 29 13 66 —< 1 0.28 < 0.1 0.079 0.0037 0.23 168 155 < 10750 0.84 32S/13E-31H13 4/19/2012 390 110 83 4.3 2.5 26 400 68 —< 1 0.22 0.23 0.09 0.032 0.39 420 20 < 10790 0.24 32S/13E-31H13 1/12/2012 410 94 95 4.5 3 28 300 68 —< 1 0.24 < 0.2 0.1 0.032 0.31 320 20 < 10760 0.89 32S/13E-31H13 11/21/2011 410 94 83 4.6 3.4 30 152 72 —< 1 0.21 < 0.1 0.09 0.035 0.3 160 8 < 10730 0.65 32S/13E-31H13 7/25/2011 420 89.7 84 7.1 4.4 31 147.5 91.8 —< 1 0.2 < 0.1 0.071 0.046 0.297 150 2.5 < 5760 1.9 32S/13E-31H13 4/21/2011 380 88 110 6.3 4 27 140 101 —< 1 0.41 0.14 0.07 0.13 0.33 140 < 2< 2750 ND32S/13E-31H13 1/24/2011 430 83 73 6 6.3 31 160 100 —< 1 0.22 0.11 0.66 0.078 0.28 160 < 2< 2780 0.49 32S/13E-31H13 10/21/2010 410 87 100 3.9 6 33 148 100 —< 1 0.14 < 0.1 ND 0.087 < 0.3 148 < 10< 10796 0.66 32S/13E-31H13 7/26/2010 446 94 93 8.81 10.2 32 38.4 120 —< 0.5 0.142 < 0.1 0.32 0.196 0.48 56 17.6 < 1700 22.4 32S/13E-31H13 4/26/2010 416 96 87.6 9.86 14.8 37.1 46 150 —0.63 0.132 < 0.1 0.39 0.579 0.44 58 12 < 1780 56.2 32S/13E-31H13 1/27/2010 498 89 79.6 10.2 15.6 38 31 180 —0.56 0.132 < 0.1 0.19 0.283 0.38 51 20 < 1810 23.6 32S/13E-31H13 10/20/2009 446 100 97.1 12.8 16.4 37.9 26.6 180 —0.56 0.168 0.15 < 0.1 0.18 0.42 42.6 16 < 1760 18.9 32S/13E-31H13 8/19/2009 426 160 101 18.9 93.2 29.1 64.4 36 —0.98 ND 0.16 0.31 5.49 0.6 84.4 20 < 1790 682 32S/13E-31H13 5/16/1983 770 60 70 ND 90 70 330 120 —ND ND 0.1 ND 0.02 ND330 NDND1100 0.24 P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Quality.xlsx2/2/2024Page 297 of 306
Appendix A: NCMA Sentry Wells Water Level DataWell DateTotal Dissolved SolidsChloride Sodium Potassium Calcium MagnesiumAlkalinity, Bicarbonate (as CaCO3)Sulfate Nitrite (as N)Total Kjeldahl NitrogenBoron Fluoride Iodide Manganese BromideAlkalinity, Total (as CaCO3)Alkalinity, Carbonate (as CaCO3)Alkalinity, Hydroxide (as CaCO3)Specific ConductanceIron12N/36W-36L01 10/12/2023 920 38 64 3.7 130 44 190 410 < 0.02 < 0.41 0.17 0.051 J 0.0021 < 0.0045 0.096 190 < 3< 31200 < 0.01412N/36W-36L01 7/6/2023 1000 39 70 3.7 140 45 180 420 —< 0.41 0.13 0.084 J< 0.00045< 0.0045 0.098 180 < 3< 31200 < 0.01412N/36W-36L01 4/13/2023 880 38 68 3.4 120 43 190 410 < 0.02 < 0.41 0.14 0.079 J ND < 0.0045 0.097 190 < 3< 31200 < 0.01412N/36W-36L01 2/9/2023 860 38 65 3.4 130 45 190 410 < 0.02 < 0.41 0.15 0.08 J 0.001 < 0.0045 0.095 190 < 3< 31200 < 0.01412N/36W-36L01 10/5/2022 880 39 68 3.4 130 47 180 440 < 0.01 < 0.088 0.15 0.032 J < 0.005 < 0.004 0.099 J 180 < 8.2 < 8.2 1200 < 0.0312N/36W-36L01 7/12/2022 920 37 66 3.3 130 45 180 430 < 0.01 < 0.088 0.18 0.054 J < 0.005 < 0.004 < 0.14 180 < 8.2 < 8.2 1210 < 0.0312N/36W-36L01 4/6/2022 840 37 64 3.3 130 43 180 400 < 0.05 0.15 J 0.15 0.033 J < 0.1 < 0.01 < 0.2 180 < 8.2 < 8.2 1190 < 0.0512N/36W-36L01 1/6/2022 810 38 62 3.3 120 42 180 420 < 0.050.29 0.15 0.044 J < 0.1 < 0.01 0.085 J 180 < 8.2 < 8.2 1190 0.031 J12N/36W-36L01 10/6/2021 890 33 67 3.3 130 44 180 400 < 0.05< 0.2 0.15 < 0.1 < 0.1 < 0.01 < 0.4 180 < 8.2 < 8.2— < 0.0512N/36W-36L01 7/15/2021 840 34 63 3.3 120 43 180 420 < 0.05< 0.2 0.17 < 0.1 < 0.1 < 0.01 < 0.4 180 < 8.2 < 8.2 1180 < 0.0512N/36W-36L01 4/8/2021 840 38 67 3.4 130 44 180 420 < 0.01 0.19 J 0.16 0.047 J < 0.005 < 0.004 < 0.07 180 < 8.2 < 8.2 1170 < 0.0312N/36W-36L01 1/7/2021 820 39 69 3.3 130 47 180 430 < 0.010.48 0.16 0.053 < 0.005 < 0.004 0.17 180 < 8.2 < 8.2 1170 < 0.0312N/36W-36L01 10/11/2020 940 39 67 3.3 130 44 180 440 < 0.01 0.14 J 0.16 0.046 J < 0.005 0.004 J 0.1 J 180 < 8.2 < 8.2 1180 0.08 12N/36W-36L01 7/8/2020 1000 40 71 3.5 130 46 180 430 < 0.01 < 0.088 0.17 0.051 < 0.01 < 0.004 0.13 J 180 < 8.2 < 8.2 1190 < 0.0312N/36W-36L01 4/22/2020 880 38 65 3.3 120 42 180 420 < 0.01 0.14 J 0.16 0.034 J < 0.01 < 0.004 0.08 J 180 < 8.2 < 8.2 1210 0.055 12N/36W-36L01 1/15/2020 960 39 70 3.6 140 45 180 420 < 0.01 0.13 J 0.18 0.056 < 0.01 < 4 0.092 J 180 < 8.2 < 8.2 1140 0.1 12N/36W-36L01 10/15/2019 880 38 73 3.6 140 45 180 440 < 0.01 0.093 J 0.18 0.044 J < 0.01 < 4 0.12 J 180 < 8.2 < 8.2 1190 0.078 12N/36W-36L01 7/10/2019 1100 37 70 3.6 140 51 180 430 < 0.01 0.15 J 0.17 0.047 J < 0.01 < 0.004 < 0.076 180 < 8.2 < 8.2 1180 < 0.0312N/36W-36L01 4/10/2019 870 39 64 3.5 130 48 180 440 < 0.011.5 0.16 0.056 < 0.01 < 0.004 0.14 J 180 < 8.2 < 8.2 1190 0.078 12N/36W-36L01 1/9/2019 840 39 70 3.4 140 46 180 420 0.022 J 0.23 0.17 0.064 < 0.01 < 0.004 0.089 J 180 < 8.2 < 8.2 1200 < 0.0312N/36W-36L01 10/10/2018 850 38 67 3.5 140 49 180 430 < 0.01 0.16 J 0.16 0.026 J < 0.01 < 0.004 < 0.058 180 < 8.2 < 8.2 1190 0.19 12N/36W-36L01 7/10/2018 960 39 64 3.4 130 47 180 430 < 0.01 0.11 J 0.17 0.12 < 0.01 < 0.004 0.063 J 180 < 8.2 < 8.2 1230 < 0.0312N/36W-36L01 4/11/2018 900 39 70 3.5 140 49 180 430 < 0.01 0.11 J 0.16 0.052 < 0.01 < 0.004 0.1 180 < 8.2 < 8.2 1190 < 0.0312N/36W-36L01 1/11/2018 940 38 76 3.5 140 50 180 440 < 0.01 0.19 J 0.17 0.073 < 0.01 < 0.004 0.097 J 180 < 8.2 < 8.2 1180 < 0.0312N/36W-36L01 10/11/2017 880 35 65 3.7 140 50 190 430 < 0.01 0.14 J 0.19 0.048 J < 0.01 0.0054 J < 0.12 190 < 8.2 < 8.2 1210 0.23 12N/36W-36L01 7/12/2017 1000 37 73 3.9 150 55 180 420 < 0.01 0.15 J 0.17 0.034 J < 0.01 0.0048 J < 0.058 180 < 8.2 < 8.2 1180 0.23 12N/36W-36L01 4/12/2017 860 37 73 4 130 49 180 420 < 0.01 0.14 J 0.17 0.017 J < 0.01 0.0087 J 0.062 J 180 < 8.2 < 8.2 1170 0.43 12N/36W-36L01 1/12/2017 870 38 76 3.8 150 55 190 430 < 0.01 0.12 J 0.21 0.036 J < 0.01 < 0.004 0.07 J 190 < 8.2 < 8.2 1180 0.11 12N/36W-36L01 10/12/2016 890 35 72 3.8 140 56 190 430 0.019 J 0.11 J 0.17 0.036 J < 0.01 < 0.004 0.12 J 190 < 8.2 < 8.2 1220 0.037 J12N/36W-36L01 7/19/2016 920 37 69 3.6 130 50 180 430 —0.25 0.15 0.043 < 0.01 < 0.004 0.1 180 < 8.2 < 8.2 1200 < 0.0312N/36W-36L01 4/12/2016 860 38 65 3.5 130 49 180 390 —< 0.08 0.16 0.036 < 0.01 < 0.004 0.12 180 < 8.2 < 8.2 1210 < 0.0512N/36W-36L01 1/14/2016 890 36 64 3.4 130 49 180 410 —< 0.08 0.15 0.062 < 0.01 < 0.004 0.1 180 < 8.2 < 8.2 1210 0.07 12N/36W-36L01 10/15/2015 920 37 63 4.2 120 47 180 400 —< 1 0.15 < 0.2 < 0.01 < 0.005 < 0.2 180 < 10< 101210 < 0.0512N/36W-36L01 7/16/2015 930 39 74 2.8 140 50 180 410 —< 1 0.15 < 0.1 < 0.01 < 0.005 < 0.1 180 < 10< 101210 < 0.0512N/36W-36L01 4/14/2015 890 38 55 3.1 110 44 180 440 —1 0.16 < 0.2 < 0.01 < 0.005 < 0.2 180 < 10< 101160 < 0.0512N/36W-36L01 1/13/2015 880 39 59 3 120 45 180 440 —< 1 0.14 < 0.1 < 0.01 < 0.005 < 0.1 180 < 10< 101160 < 0.0512N/36W-36L01 10/15/2014 910 34 58 3.7 120 43 180 380 —< 1 0.14 < 0.2 < 0.01 < 0.005 < 0.2 180 < 10< 101210 < 0.0512N/36W-36L01 7/30/2014 890 36 61 3.2 120 47 180 390 —< 1 0.12 < 0.2 < 0.01 < 0.005 < 0.2 180 < 10< 101220 < 0.0512N/36W-36L01 4/16/2014 910 36 46 2.6 76 27 180 440 —< 1 0.15 < 0.1 < 0.01 < 0.005 < 0.1 180 < 10< 101200 < 0.0512N/36W-36L01 1/16/2014 910 35 60 3.1 110 42 180 416 —1.1 0.14 < 0.2 < 0.01 < 0.005 < 0.2 180 < 10< 101190 < 0.0512N/36W-36L01 10/16/2013 910 40 63 4.5 120 43 170 460 —< 1 0.13 < 0.2 < 0.01 < 0.005 < 0.2 170 < 10< 101210 < 0.0512N/36W-36L01 7/10/2013 910 39 54 3.2 120 42 175 430 —< 1 0.14 < 0.1 < 0.01 < 0.005 < 0.1 175 < 10< 101210 0.18 12N/36W-36L01 4/11/2013 890 38 59 3.6 110 43 180 420 —< 1 0.16 < 0.2 < 0.01 < 0.005 < 0.2 180 < 10< 101200 < 0.0512N/36W-36L01 1/15/2013 870 39 61 3.4 110 41 178 440 —< 1 0.15 < 0.2 < 0.01 < 0.005 < 0.2 178 < 10< 101190 0.13 12N/36W-36L01 10/31/2012 910 35 66 4 130 46 165 400 —< 1 0.16 0.2 < 0.01 < 0.005 < 0.5 165 < 10< 101200 < 0.0512N/36W-36L01 7/24/2012 880 43 65 3.9 110 41 168 420 —< 1 0.16 < 0.1 < 0.01 0.02 < 0.1 168 < 10< 101190 0.19 12N/36W-36L01 4/18/2012 880 47 52 3.2 95 36 180 450 —< 1 0.12 < 0.2 < 0.01 < 0.005 < 0.2 180 < 10< 101190 < 0.112N/36W-36L01 1/11/2012 790 41 64 4.1 120 44 170 380 —< 1 0.19 0.18 < 0.02 < 0.005 < 0.2 170 < 10< 101190 < 0.112N/36W-36L01 11/21/2011 910 39 55 3.5 110 40 180 380 —< 1 0.16 < 0.2 < 0.01 < 0.005 < 0.2 180 < 10< 101200 < 0.112N/36W-36L01 7/25/2011 890 40.5 65 5.7 110 43 170 408.9 —< 1 0.15 < 0.1 < 0.01 < 0.005 < 0.1 170 < 5< 51200 0.024 12N/36W-36L01 4/21/2011 890 42 61 4.2 100 30 170 415 —< 1 0.19 0.07 < 0.01 < 0.005 < 0.1 170 < 2< 21200 ND12N/36W-36L01 1/24/2011 890 41 55 5.1 98 36 180 400 —< 1 0.2 0.15 < 0.1 < 0.005 < 0.1 180 < 2< 21200 < 0.112N/36W-36L01 10/21/2010 910 38 76 3.6 130 47 169 400 —< 1 0.1 < 0.1 ND < 0.005 < 0.3 169 < 10< 101213 < 0.112N/36W-36L01 7/27/2010 707 36 64.2 3.7 127 47.4 182 420 —< 0.5 0.158 < 0.1 < 0.1 < 0.005 0.11 182 < 1< 11100 < 0.1P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Quality.xlsx2/2/2024Page 298 of 306
Appendix A: NCMA Sentry Wells Water Level DataWell DateTotal Dissolved SolidsChloride Sodium Potassium Calcium MagnesiumAlkalinity, Bicarbonate (as CaCO3)Sulfate Nitrite (as N)Total Kjeldahl NitrogenBoron Fluoride Iodide Manganese BromideAlkalinity, Total (as CaCO3)Alkalinity, Carbonate (as CaCO3)Alkalinity, Hydroxide (as CaCO3)Specific ConductanceIron12N/36W-36L01 4/26/2010 860 42 70.3 4.13 129 48.9 191 400 —0.77 0.223 < 0.1 0.15 0.057 0.14 191 < 1< 11100 4.53 12N/36W-36L01 10/21/2009 856 38 72 4.64 131 48.2 192 420 —0.84 0.15 0.12 < 0.1 0.0994 0.13 192 < 1< 11100 1.68 12N/36W-36L01 8/20/2009 890 39 78 4.21 138 48.1 184 390 —0.56 ND < 0.1 < 0.1 0.185 0.14 184 < 1< 11200 2.03 12N/36W-36L01 5/11/2009 832 63 83.8 4.88 111 45.4 204 330 —ND ND 0.12 ND 0.551 0.22 204 < 1< 11200 4.02 12N/36W-36L01 3/26/1996 882 35 66 4.8 124 47 233 408 —ND 0.24 ND ND ND NDNDNDNDND ND12N/36W-36L01 6/8/1976 936 38 72 3.5 130 48 223 423 —ND 0.15 0.7 ND ND NDNDNDNDND NDP:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Quality.xlsx2/2/2024Page 299 of 306
Appendix A: NCMA Sentry Wells Water Level DataWell DateTotal Dissolved SolidsChloride Sodium Potassium Calcium MagnesiumAlkalinity, Bicarbonate (as CaCO3)Sulfate Nitrite (as N)Total Kjeldahl NitrogenBoron Fluoride Iodide Manganese BromideAlkalinity, Total (as CaCO3)Alkalinity, Carbonate (as CaCO3)Alkalinity, Hydroxide (as CaCO3)Specific ConductanceIron12N/36W-36L02 10/12/2023 960 92 100 5.8 96 41 270 240 < 0.021.7 0.34 0.15 0.19 0.14 0.62 270 < 3< 31200 < 0.01412N/36W-36L02 7/6/2023 860 94 93 5.3 85 39 250 250 —1.4 0.26 0.16 0.18 0.13 0.62 250 < 3< 31200 < 0.01412N/36W-36L02 4/13/2023 790 94 110 5.6 94 40 260 250 < 0.021.3 0.29 0.14 0.16 0.13 0.59 260 < 3< 31200 0.11 12N/36W-36L02 2/9/2023 770 88 97 5.3 99 43 270 260 < 0.02< 1 0.28 0.14 0.17 0.17 0.54 270 < 3< 31200 0.034 12N/36W-36L02 10/5/2022 840 96 110 5.8 100 46 250 260 < 0.011.7 0.33 0.091 0.12 0.15 0.61 250 < 8.2 < 8.2 1210 < 0.0312N/36W-36L02 7/12/2022 810 98 93 5.2 87 40 260 250 < 0.011.9 0.32 0.096 0.12 0.13 0.4 260 < 8.2 < 8.2 1220 < 0.0312N/36W-36L02 4/6/2022 780 93 94 5.2 85 38 250 250 < 0.051.9 0.3 0.063 0.13 0.13 0.5 250 < 8.2 < 8.2 1210 < 0.0512N/36W-36L02 1/6/2022 800 95 96 5.4 87 39 250 250 0.016 J1.7 0.31 0.076 0.12 0.14 0.61 250 < 8.2 < 8.2 1210 < 0.0512N/36W-36L02 10/6/2021 760 93 110 5.7 96 41 260 230 < 0.051.5 0.3 0.079 0.13 0.14 0.5 260 < 8.2 < 8.2— 0.031 J12N/36W-36L02 7/15/2021 820 98 100 5.4 90 39 260 240 < 0.052.1 0.31 0.1 0.13 0.14 0.59 260 < 8.2 < 8.2 1190 0.11 12N/36W-36L02 4/8/2021 800 99 91 4.8 77 35 270 240 0.012 J1.8 0.28 0.099 0.13 0.12 0.57 270 < 8.2 < 8.2 1190 0.036 J12N/36W-36L02 1/7/2021 860 98 110 6.1 100 46 260 240 < 0.011.8 0.34 0.096 0.18 0.16 0.43 260 < 8.2 < 8.2 1180 0.26 12N/36W-36L02 10/11/2020 870 98 98 5.4 95 40 250 250 < 0.011.7 0.29 0.084 0.13 0.13 0.62 250 < 8.2 < 8.2 1190 < 0.0312N/36W-36L02 7/8/2020 930 100 110 5.8 97 42 260 240 < 0.011.8 0.31 0.093 0.13 0.14 0.65 260 < 8.2 < 8.2 1210 0.087 12N/36W-36L02 4/22/2020 770 100 110 6 97 40 270 230 < 0.012.1 0.33 0.069 0.12 0.15 0.67 270 < 8.2 < 8.2 1190 0.56 12N/36W-36L02 1/15/2020 860 100 110 6.2 100 43 260 240 < 0.011.9 0.35 0.085 0.16 0.16 0.35 260 < 8.2 < 8.2 1160 0.16 12N/36W-36L02 10/15/2019 780 99 120 6.3 100 41 270 240 < 0.012 0.35 0.078 0.13 0.17 0.66 270 < 8.2 < 8.2 1210 0.49 12N/36W-36L02 7/10/2019 1000 99 100 5.9 94 44 260 240 < 0.011.9 0.33 0.096 0.15 0.15 0.6 260 < 8.2 < 8.2 1200 0.14 12N/36W-36L02 4/10/2019 820 100 100 5.7 96 43 270 240 < 0.012 0.32 0.094 0.13 0.15 0.53 270 < 8.2 < 8.2 1220 0.17 12N/36W-36L02 1/9/2019 820 100 110 6.1 99 42 270 240 < 0.012.2 0.33 0.099 0.14 0.15 0.5 270 < 8.2 < 8.2 1220 0.42 12N/36W-36L02 10/10/2018 840 99 110 7.2 100 46 260 240 < 0.012.2 0.33 0.064 0.13 0.19 0.4 260 < 8.2 < 8.2 1200 5.2 12N/36W-36L02 7/10/2018 800 100 99 5.6 89 41 260 240 < 0.012 0.33 0.14 0.14 0.14 0.62 260 < 8.2 < 8.2 1260 0.9 12N/36W-36L02 4/11/2018 850 100 110 6 96 42 260 230 < 0.011.8 0.32 0.097 0.16 0.17 0.66 260 < 8.2 < 8.2 1210 2.1 12N/36W-36L02 1/11/2018 800 100 110 6.3 97 44 260 230 < 0.012 0.38 0.12 0.17 0.17 0.65 260 < 8.2 < 8.2 1190 0.51 12N/36W-36L02 10/11/2017 830 100 100 5.9 97 44 280 230 < 0.011.8 0.36 0.087 0.13 0.16 0.66 280 < 8.2 < 8.2 1220 0.41 12N/36W-36L02 7/12/2017 940 97 100 6.1 98 45 250 230 < 0.012.2 0.32 0.096 0.13 0.16 0.59 250 < 8.2 < 8.2 1200 0.75 12N/36W-36L02 4/12/2017 780 97 120 6.7 98 43 250 240 < 0.012.2 0.35 0.082 0.14 0.16 0.51 250 < 8.2 < 8.2 1190 0.77 12N/36W-36L02 1/12/2017 810 94 120 6.6 110 48 270 240 < 0.012 0.36 0.08 0.19 0.19 0.53 270 < 8.2 < 8.2 1200 1.1 12N/36W-36L02 10/12/2016 820 99 120 6.6 110 50 270 240 0.018 J2 0.35 0.084 0.14 0.17 0.58 270 < 8.2 < 8.2 1230 0.1 12N/36W-36L02 7/19/2016 820 97 110 6.2 95 45 270 240 —2 0.33 0.081 0.1 0.15 0.65 270 < 8.2 < 0.82 1220 0.14 12N/36W-36L02 4/12/2016 800 96 100 6 94 44 270 230 —1.8 0.32 0.12 0.12 0.14 0.81 270 < 8.2 < 0.82 1240 0.37 12N/36W-36L02 1/14/2016 860 96 110 6.4 99 47 260 230 —1.6 0.34 0.1 0.078 0.17 0.65 260 < 8.2 < 8.2 1240 1.9 12N/36W-36L02 10/15/2015 800 89 96 6 91 0.15 266 230 —2.2 0.32 0.22 0.098 0.15 0.37 266 < 10< 101220 0.32 12N/36W-36L02 7/16/2015 840 97 120 5.9 110 46 260 240 —2.44 0.34 0.11 0.11 0.15 0.59 260 < 10< 101230 0.16 12N/36W-36L02 4/14/2015 800 98 88 5.3 83 39 270 240 —2.9 0.33 0.104 0.089 0.13 0.38 270 < 10< 101180 0.4 12N/36W-36L02 1/13/2015 820 100 91 5.5 86 39 250 250 —2.2 0.31 0.105 0.09 0.13 0.322 250 < 10< 101190 0.077 12N/36W-36L02 10/15/2014 800 88 96 6.4 91 40 260 210 —2.1 0.32 < 0.1 0.092 0.14 0.358 260 < 10< 101230 0.12 12N/36W-36L02 7/30/2014 800 98 99 5.8 88 39 280 210 —2.4 0.28 0.11 0.09 0.14 0.19 280 < 10< 101240 0.27 12N/36W-36L02 4/16/2014 820 95 89 6.3 73 31 280 210 —2.3 0.31 < 0.1 0.09 0.13 0.35 280 < 10< 101240 0.22 12N/36W-36L02 1/16/2014 800 100 87 5 76 33 270 230 —2.3 0.31 0.23 0.09 0.14 0.44 270 < 10< 101230 0.41 12N/36W-36L02 10/16/2013 810 90 110 6.4 91 40 260 240 —2.2 0.32 < 0.1 0.1 0.15 0.32 260 < 10< 101220 0.54 12N/36W-36L02 7/10/2013 790 105 94 5.8 88 38 260 240 —2.5 0.34 < 0.1 0.08 0.13 0.11 260 < 10< 101240 0.31 12N/36W-36L02 4/11/2013 830 100 99 6.2 83 37 260 220 —2.2 0.35 < 0.1 0.098 0.14 0.45 260 < 10< 101240 0.6 12N/36W-36L02 1/15/2013 770 110 110 6.7 84 38 265 220 —2.8 0.36 < 0.1 0.02 0.14 0.2 265 < 10< 101240 0.61 12N/36W-36L02 10/31/2012 800 100 120 7.3 90 39 265 200 —2.4 0.4 0.34 0.12 0.14 0.34 265 < 10< 101250 0.3 12N/36W-36L02 7/24/2012 800 134 125 7.4 83 35 277 200 —2.3 0.42 0.13 0.12 0.14 0.31 277 < 10< 101250 0.52 12N/36W-36L02 4/18/2012 770 130 95 6.2 75 33 270 210 —4 0.35 0.36 0.12 0.13 < 0.2 270 < 10< 101250 0.77 12N/36W-36L02 1/11/2012 900 122 110 7.2 95 37 290 170 —4.8 0.48 0.28 < 0.02 0.17 0.45 290 < 10< 101250 1.8 12N/36W-36L02 11/21/2011 780 130 95 6.1 77 33 270 160 —< 1 0.4 < 0.2 < 0.01 0.13 0.45 270 < 10< 101240 0.4 12N/36W-36L02 7/25/2011 790 128.8 110 9.1 74 33 280 177 —2.3 0.36 0.123 0.14 0.13 0.511 280 < 5< 51280 2.3 12N/36W-36L02 4/21/2011 770 120 90 5.3 86 26 280 206 —2.3 0.24 0.26 0.14 0.004 0.57 280 < 2< 21270 ND12N/36W-36L02 1/24/2011 800 120 95 7.6 75 30 300 190 —2.3 0.39 0.16 1.31 0.13 0.53 300 < 2< 21270 1.4 12N/36W-36L02 10/21/2010 770 120 130 7.6 89 44 275 160 —3.4 0.48 < 0.1 ND 0.15 0.54 275 < 10< 101293 0.12 P:\Portland\672-Northern Cities Management Area\010-2023 Annual Report\02 AR\App\working\Tables\NCMA_App_A_Water_Quality.xlsx2/2/2024Page 300 of 306