CC 2019-04-23_11b Water System Master Plan_Future Water Well ProjectMEMORANDUM
TO: CITY COUNCIL
FROM: BILL ROBESON, PUBLIC WORKS DIRECTOR
BY: SHANE TAYLOR, UTILITIES MANAGER
JILL MCPEEK, CAPITAL IMPROVEMENT PROJECT MANAGER
SUBJECT: CONSIDERATION OF A RESOLUTION AMENDING THE 2012 WATER
SYSTEM MASTER PLAN TO INCLUDE A FUTURE WATER WELL
PROJECT AT STROTHER PARK
DATE: APRIL 23, 2019
SUMMARY OF ACTION:
Presentation of Well Siting Study findings and amendment to the 2012 Water System
Master Plan.
IMPACT ON FINANCIAL AND PERSONNEL RESOURCES:
The FY 2017/18 Capital Improvement Program Budget included an allocation of $63,200
for the preparation of a Well Siting Study. The cost of the Well Siting Study was $30,000.
There are no further impacts to financial and/or personnel resources.
RECOMMENDATION:
It is recommended the City Council:
1. Receive and file the Well Siting Study report dated March 6, 2019, by Cleath-Harris
Geologists, Inc.; and
2. Adopt a Resolution amending the 2012 Water System Master Plan to include a future
water well project at Strother Park.
BACKGROUND:
On March 28, 2017, the City Council adopted a Resolution approving the formation of the
City of Arroyo Grande Groundwater Sustainability Agency (GSA). The purpose of the well
siting study is to determine if the City should construct a new municipal drinking water
well at or near 1150 Huasna Road in Arroyo Grande (Strother Park), with the intent to
establish appropriative rights to the groundwater in the newly formed GSA.
On November 1, 2017, requests for proposals (RFPs) for a well siting study were
distributed to four civil engineering firms who specialize in hydrogeological services. One
firm, Cleath-Harris Geologists, Inc. (CHG), submitted a proposal.
Item 11.b. - Page 1
CITY COUNCIL
CONSIDERATION OF A RESOLUTION AMENDING THE 2012 WATER SYSTEM
MASTER PLAN TO INCLUDE A FUTURE WATER WELL PROJECT AT STROTHER
PARK
APRIL 23, 2019
PAGE 2
A review committee consisting of three City staff members reviewed the proposal and
determined that it met the criteria and that CHG was qualified to perform the well siting
analysis. On February 1, 2018, a kickoff meeting was held and since then City staff has
worked with CHG to complete the Well Siting Study.
ANALYSIS OF ISSUES:
A water well at or in the vicinity of Strother Park could serve to irrigate the park or
potentially provide a source for potable water to the City. As part of the study, several
parcels in the area were evaluated and it was determined that Strother Park was the most
viable location for a new water well to provide the desired production.
After reviewing the hydrogeology, water quality and various constraints pertaining to
Strother Park, an irrigation well located near the restrooms was determined to be the
preferred location. It is recommended that the new well have a minimum pumping rate of
75 gallons per minutes (gpm) in order to meet maximum demand during periods of high
evapotranspiration.
Adopting the Resolution allows a future water well project at Strother Park to be included
as a capital improvement in the City’s 2012 Water System Master Plan. By inclusion in
the Water System Master Plan, the water well project may provide an opportunity for a
water offset to support future development that exceeds baseline water allocations. The
Well Siting Study provides a complete report that may be used for future consideration of
drilling and operating a water well at Strother Park.
ALTERNATIVES:
The following alternatives are provided for the Council’s consideration:
1. Approve staff’s recommendations;
2. Do not approve staff’s recommendation and request further information;
3. Modify Staff’s recommendation and approve; or
4. Provide direction to staff.
ADVANTAGES:
Amending the 2012 Water System Master Plan to include a future water well project at
Strother Park is a further step in accomplishing that goal.
DISADVANTAGES:
No disadvantages noted at this time.
ENVIRONMENTAL REVIEW:
No environmental review is required to receive and file the report.
Item 11.b. - Page 2
CITY COUNCIL
CONSIDERATION OF A RESOLUTION AMENDING THE 2012 WATER SYSTEM
MASTER PLAN TO INCLUDE A FUTURE WATER WELL PROJECT AT STROTHER
PARK
APRIL 23, 2019
PAGE 3
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.
Attachment:
1. Well Siting Study; Strother Park, City of Arroyo Grande, dated March 6, 2019,
by Cleath-Harris Geologists, Inc.
Item 11.b. - Page 3
RESOLUTION NO.
A RESOLUTION OF THE CITY COUNCIL OF THE CITY OF
ARROYO GRANDE AMENDING THE 2012 WATER
SYSTEM MASTER PLAN TO INCLUDE A FUTURE WATER
WELL PROJECT AT STROTHER PARK
WHEREAS, the City provides potable water and fire suppression for residential,
commercial, and institutional buildings within the City; and
WHEREAS, as older infrastructure is replaced and new development projects are
constructed, it is the City's intent to construct water improvements consistent with the
ultimate needs of the system and the available water supply; and
WHEREAS, the City Council adopted the 2012 Water System Master Plan by Resolution
4506 on January 22, 2013; and
WHEREAS, the 2012 Water System Master Plan identifies capital improvement projects
that are necessary to meet the future needs of the City; and
WHEREAS, the City has completed a Well Siting Study that has determined the feasibility
of constructing a new water well at Strother Park.
NOW, THEREFORE BE IT RESOLVED that the City Council of the City of Arroyo Grande
hereby approves amending the 2012 Water System Master Plan to include capital
improvement project C-10, New Water Well at Strother Park.
On motion of Council Member , seconded by Council Member , and
on the following roll call vote, to wit:
AYES:
NOES:
ABSENT:
the foregoing Resolution was passed and adopted this 23rd day of April, 2019.
Item 11.b. - Page 4
RESOLUTION NO.
PAGE 2
KRISTEN BARNEICH, MAYOR PRO TEM
ATTEST:
KELLY WETMORE, CITY CLERK
APPROVED AS TO CONTENT:
JAMES A. BERGMAN, CITY MANAGER
APPROVED AS TO FORM:
HEATHER K. WHITHAM, CITY ATTORNEY
Item 11.b. - Page 5
Strother Park Well Siting Report 1 3/6/2019
March 6, 2019
City of Arroyo Grande
1375 Ash Street
Arroyo Grande, CA 93420
Subject: Well Siting Study; Strother Park, City of Arroyo Grande
Cleath-Harris Geologists (CHG) has performed a well siting study for the City of Arroyo
Grande. The City is considering constructing a new water well at 1150 Huasna Road in
Arroyo Grande (Strother Park). A water well at Strother Park could serve to irrigate the
park or potentially to provide a source for potable water to the City. The City also owns
other parcels and road right of ways, adjacent to the park, that were reviewed as options
for groundwater development.
The initial well siting study scope of work included the following tasks:
Identify the properties (City owned or where the City would consider an easement) where groundwater
development could potentially take place;
Define the project demands and existing water facilities for the park;
Define the hydrogeology of these areas based on available information and site geologic/hydrologic
reconnaissance;
Determine what exploration may be necessary to verify the potential capacity and quality of groundwater
resources in the project area and prepare an exploration program.
Subsequent to the initial well siting study, CHG was given the go ahead to do some
geophysical surveys to refine the well site location and the base of the alluvial deposits
map. As a part of this exploration, CHG performed geophysical survey lines through
Strother Park and along Coach Road. Results of the exploratory geophysics have been
incorporated into this updated well siting report. The technical memorandum
summarizing the geophysical investigation findings, conclusions, and recommendations
is attached to this well siting report.
CRITERIA FOR WELL SITING/CONSTRUCTION
Criteria for water well siting and construction are included in the State of California
Department of Water Resources Bulletin 74-90, County of San Luis Obispo Planning and
Health Department code, State of California Department of Public Health regulations,
and Central Coast Regional Water Quality Control Board Regulations. The City has
responsibility for California Environmental Quality Act (CEQA) processing and
compliance.
ATTACHMENT 1
Item 11.b. - Page 6
Cleath-Harris Geologists, Inc.
71 Zaca Lane, Suite 140
San Luis Obispo, CA 93401
(805) 543-1413
Strother Park Well Siting Report 3/6/2019 2
A suitable well site is one which conforms to regulatory setbacks, allows for construction
activities, has sufficient area for well head facilities, and has close proximity to point of
use. A water well shall be set back off of a property line by at least 10 feet. Water
treatment, if required, would increase the well site area.
Health based setbacks for irrigation wells are much less than for community water supply
wells. The critical setback for a well at Strother Park is the setback from Arroyo Grande
Creek. A community water supply well is required to have a setback of 150 feet from a
stream (top of bank) to allow for natural microbial and turbidity filtration/removal for
domestic uses. Community water supply well setbacks from leach fields, animal
enclosures and chemical storage are 100 feet. An irrigation well should be located 50
feet from the top of bank to allow for microbial filtration and removal through the
alluvial sands and gravels.
Water well seal regulations require a 50-foot deep annular sanitary seal with exceptions
for shallow wells but shall be no less than 10-feet. A community water supply well is
required to have a 50-foot annular seal.
The well head is required to be above the 100-year flood elevation. At Strother Park, the
100-year flood elevation is 151 feet and, except for a small area near the creek, the park
is above this elevation. At Coach Road, the 100-year flood elevation is 145.6 feet. This
100-year flood elevation along Coach Road northwest of East Cherry Road is above the
ground surface elevation near Arroyo Grande Creek. At the up-stream City-owned
parcel, the eastern portion of the property is above the 100-year flood elevation.
STROTHER PARK/NEARBY CITY PARCELS, RIGHT-OF-WAYS AND
EASEMENTS
Strother Park and nearby parcels, right-of-ways and easements are shown on the LiDAR
database topographic/aerial photographic map (Figure 1). Groundwater management
within this area is attended to by the City of Arroyo Grande Groundwater Sustainability
Agency. Figure 2 shows the location of Strother Park relative to the revised Santa Maria
Valley Groundwater Basin Boundaries and City of Arroyo Grande Groundwater
Sustainability Agency boundary.
Strother Park
Strother Park is a 6.5-acre City-owned park in Arroyo Grande, California located in the
Arroyo Grande Creek Valley between Arroyo Grande Creek and Huasna Road. Strother
Park is bordered by the Loomis Tract on the southwest, the Johnson property on the
northeast, and by a City-owned parcel along Arroyo Grande Creek.
Item 11.b. - Page 7
Item 11.b. - Page 8Explanation
e Well With City Water Rights El evation Contours
• Adjacent Wells (WCR Number) : City of Arroyo Grande
Arroyo Grande City Property D Parcels
I' ~, ~ 000•1
Con to ur Interval 10 feet
Figure 1
Strother Park Location Map
City of Arroyo Grande
Cleath-Harris Geologists
Figure 2Santa Maria Groundwater Basin BoundaryArroyo Grande Valley Fringe AreaNCity ofArroyo GrandeGSA (within City limits)Santa Maria Basinfringe areasGSAsPrevious DWR Bulletin 118Boundary LineApproved DWR Bulletin 118Boundary Line RevisionStrotherParkItem 11.b. - Page 9
Strother Park Well Siting Report 3/6/2019 3
The park gently slopes from an elevation of 154 feet at Huasna Road to 144 feet at the
end of the parking lot with a lower terrace adjacent to the incised creek bed (at an
elevation of about 126 feet. Across the creek, the alluvial flood plain is at an elevation of
170 feet.
Arroyo Grande Creek Parcels
The City also owns parcels along Arroyo Grande Creek: a parcel upstream (007-761-025)
and across the creek from the park; a parcel downstream from the park (007-762-040);
and an unnumbered parcel along Coach Road which also crosses Arroyo Grande Creek to
Huasna Road at the sewer lift station). Parcel 007-761-025 borders along Arroyo Grande
Creek, with a parallel border 142 feet southeast of Arroyo Grande Creek. This parcel has
an area on the flood plain terrace where a well could be drilled and is immediately
adjacent to the City well easement on APN 007-762-032. Insufficient setback distance
from the creek exists for a public water supply well at this property but an irrigation well
could be sited on this property. Access is possible with the City pipeline/water well
easement on the adjacent parcel (APN 007-762-032). Parcel 007-762-040 is dissected by
Arroyo Grande Creek with limited access on the northern side of Arroyo Grande Creek,
but the parcel south of Arroyo Grande Creek could be accessed off of Coach Road. A
well cannot be drilled on the northern side of this parcel due to lack of access. The
southern side of this parcel does not appear to have sufficient distance from the creek to
allow a public water supply well.
Right-of-Ways
The Coach Road right-of-way crosses the creek valley from Huasna Road to Branch Mill
Road and would allow for a sufficient setback distance from the creek on the eastern side.
Piping of water from a well along the Coach Road right-of-way to Strother Park would
require crossing Arroyo Grande Creek and following Huasna Road several hundred feet.
Well Easement
The City owns a water right for excess water from an irrigation well on the property at
1189 Flora Road about 500 feet upstream and east of the creek, immediately adjacent to
the City-owned parcel along the Arroyo Grande Creek upstream of the park. The use of
this well for water supply to Strother Park irrigation is expressly stated in the agreement.
The well easement is defined in the Agreement between the City and the former
landowner. “Allowable uses for the Excess Water shall be any and all lawful uses for the
public benefit including use by the City at Strother Park.” The details of this grant and
easement for water rights and facilities are included in the Appendix.
Item 11.b. - Page 10
Strother Park Well Siting Report 3/6/2019 4
WATER DEMAND
Strother Park non-potable water use is for irrigating landscape and turf. Water is also
provided to the restrooms and the picnic area. The water for the park, provided from the
City of Arroyo Grande water system, was 22 acre-feet per year in 2013 and 9.2 acre-feet
per year in 2017 after water conserving measures were enacted. The water demand for
the park under current conditions would therefore be, on average, 5.7 gallons per minute
(gpm). Typically, irrigation systems for turf at schools or parks require about 75 gpm.
At 75 gpm, the well could be operated for less than two hours per day to meet the average
daily demand and could be operated for longer durations to meet maximum demand
during periods of high evapotranspiration. Therefore, a new well should have a
minimum pumping rate of 75 gpm.
PERMITTING AND WELL LOCATION CONSTRAINTS
New well construction requires a permit from the County of San Luis Obispo Department
of Public Health, Environmental Health Division. CEQA studies would be performed by
the City of Arroyo Grande for new water wells. Under existing groundwater
management plans for the Arroyo Grande Valley fringe area, no County or State
limitation exists related to new groundwater well construction and use. Water Well
Completion Reports must be filed with the County/State of California for all water wells.
New wells operated for public water supply are regulated by the State of California and
are required to be documented and permitted prior to use.
A community water supply or irrigation well sited at the park can be located such that
setbacks for property line, wastewater and surface water contaminating influences are
met. The well head facilities can be designed to deal with flood elevation constraints.
The Pearwood Avenue parcel to the north of Huasna Road has primarily Pismo
Formation underlying it. Previous studies determined that a well at this property would
yield insufficient water for a municipal well and is not further considered for a well
serving the park.
A well completed on the Arroyo Grande Creek parcel downstream of the Park (APN 007-
762-040) would require infrastructure and easements to transport the water to park. It is
possible that an irrigation well could be drilled for the park on this parcel southeast of the
creek and be accessed by Coach Road.
The City-owned parcel (067-076-025) to the east and upstream of the park is adjacent to
the 1189 Flora Road deeded well easement (Well completion report 0962373) for which
Item 11.b. - Page 11
Strother Park Well Siting Report 3/6/2019 5
the City of Arroyo Grande has water rights and access rights. A well could be
constructed on the City-owned parcel adjacent to the 1189 Flora Road well that would
not be constrained by the easement agreement conditions. The well site would be about
130 feet from Arroyo Grande Creek and a lesser distance from the creek bank top. The
setback would not be sufficient for a public water supply well but should be sufficient for
an irrigation well. Access to this location would need to pass through the 1189 Flora
Road property with proper notification.
A community water supply or irrigation well could be constructed along Coach Road
(near to East Cherry Street, based on the geophysical survey). Setbacks would be
primarily related to onsite wastewater systems and disposal fields on adjacent parcels.
Constraints related to overhead power lines and underground pipelines would also need
considered.
HYDROGEOLOGY
Hydrogeologic investigations of the Arroyo Grande Valley (AGV) fringe area provide a
good general subbasin wide characterization. This study provides a more detailed
definition of the groundwater bearing alluvial deposits in the proximity of Strother Park,
for the purpose of determining the potential for locating a new municipal well at, or
adjacent to, Strother Park.
The 2018 BBMR technical report of the AGV fringe area submitted by the County of San
Luis Obispo to the California Department of Water Resources (DWR) includes a basin
boundary map, an irrigation area aerial photograph, a topographic map, a geologic map, a
geologic cross section longitudinally up the valley (alluvial thickness varies from less
than 20 to 150 feet), hydraulic parameter definition (a transmissivity of 15,000-90,000
gallons per day per foot and well yields from 65-450 gpm), a groundwater level contour
map for Spring 2016 (a steep groundwater level gradient is shown upstream of this area
near the confluence of Tar Springs Creek and Arroyo Grande Creek) and groundwater
level hydrographs for wells in the area (the groundwater level varies from 120-140 feet
elevation at a well across the creek from Strother Park), and a statement that the basin in
this area is in a state of approximate equilibrium/long term sustainability, receiving
significant recharge from percolation of Arroyo Grande Creek water/Lopez Lake
releases. This report was the basis for the DWR’s adoption of a modified Bulletin 118
groundwater basin area in the Arroyo Grande Creek valley and finding that concurred
with the sustainability of groundwater in the fringe area (Figure 2).
Strother Park Area Hydrogeology
The sand and gravel beds within the alluvial deposits are the most productive aquifers in
Arroyo Grande Valley, but some water can be found in the underlying bedrock
formations. The geologic map is on Figure 3; a profile of the geology underlying
Item 11.b. - Page 12
Item 11.b. - Page 13
E I t • Image Source: Hall 1973, Geol ogy of the Arroyo xp a na 100 Grande quadrangle, San Luis Obispo County, California
o Geophysi cal survey point
(base of alluvium elevation)
-Contour line (ba se of alluv ium elev ation)
• Well with log (base of alluvium elevation)
• Bedrock outcrop in creek All elevations in feet
Figure 3
Base of Alluvium
City of Arroyo Grande
Cleath-Harris Geologists
Strother Park Well Siting Report 3/6/2019 6
Strother Park is shown on Figure 4A; and a profile of the geology underlying the
Coach Road alignment is shown on Figure 4B. The alignments of the profiles are on
Figure 5.
Alluvium
The published geologic maps show that the alluvial deposits of Arroyo Grande Creek
underlie the flood plain area bounded by the hills west of Huasna Road and the hills east
of Branch Mill Road. Based on our site-specific geologic mapping and geophysical
survey, CHG verified the areal limits of the alluvial deposits. However, the depth to the
base of the alluvium rises to above the groundwater level southeast of the creek, such
that the alluvium is not water-bearing in that area.
The alluvium is bounded by, and unconformably overlies, clays and silts of the Pismo
Formation along the western boundary and porcelaneous shales of the Monterey
Formation on the eastern creek bank opposite the park parking lot). The maximum depth
of the alluvial deposits within the Arroyo Grande Valley is about 120 feet as indicated by
well completion reports for wells both upstream and downstream of Strother Park and the
CHG geophysical survey.
At Strother Park, the depth to the base of the alluvial deposits is poorly constrained by
available soils and well logs. Soils borings in the adjacent Ikeda tract do not reach the
base of the alluvium to a depth of 40 feet (about 103 foot elevation). Wells adjacent to
the park are shallow at the Johnson property and well completion reports are not available
for wells on the Johnson property. The well completion report for one well located
adjacent to the Pearwood Avenue City-owned parcel (1261 Huasna Road) found sand and
gravel deposits from 47-62 feet depth, below which a green siltstone bedrock was
encountered. This well had a depth to water of 34 feet and air-lifted 30 gpm, which is
indicative of a potential pumping rate of less than 20 gpm.
On the Strother Park parcel, the CHG geophysical survey indicates that the depth to the
base of the alluvial deposits varies from 62 feet at Huasna Road to about 110 feet near the
restrooms at Strother Park, rising to about 10 feet above the creek channel invert on the
southwest side of Arroyo Grande Creek.
The alluvial deposit tapped by the well at 1189 Flora Road (APN 007-761-032), east of
Arroyo Grande Creek, has a depth of 98 feet with a depth to water of 38.5 feet. The well
completion report log shows that there is an upper sand and gravel bed from 25 feet to 60
feet depth and a lower sand and gravel bed from 69 to 98 feet depth, separated by a clay
bed. The well was completed with perforations opposite both sand and gravel aquifers.
This well was tested and is equipped with a pump capable of producing 75 gpm.
Groundwater from this well is of poor quality for domestic or irrigation uses.
Information on this well is provided in the appendix to this report.
Item 11.b. - Page 14
Estimated lithologic
boundaries
Ground surface
geophysical survey point
A-A’ Cross Section Location, Figure 1.
Well ID
Explanation
Well
Screen
Distance (feet)Elevation (feet above sea level)0 200 400 600 800 1000 1200
180
120
-120
0
60
-60
Northwest
Southeast
A
A’
Pismo Fm.
siltstone / sandstone
Monterey Fm.
shale
Alluvium
Alluvium
porcelaneous shale bedDip
63°NE
Proposed Shallow and
Deep Well Sites
Shallow WellDeep Well(500 feet total depth)Figure 4A
Geologic Cross-Section A-A’
City of Arroyo Grande
Cleath-Harris Geologists
Huasna Rd.
E063592
SP00SP01
SP01
SP02
(projected)Arroyo Grande CreekStrother Park
Shallow Well: The anticipated base of the alluvium is 100 feet depth.
Proposed total well depth is 110 feet depth.
Deep Well: The anticipated top of the porcelaneous shale contact is
300 feet depth. Proposed total depth of deep well is 500 feet.
Item 11.b. - Page 15
\
' ', ...
.. .. .. .. .. ..
.. .. .. .. .. .. .. .. .. ..
=~
---------------,> ... ------~
.. .. ..
.. ... .. ..
.. .. .. .. .. .. .. .. ..
■■■■■■■■■■■■■■■ -. -
.. ..
.. .. .. .. .. .. .. .. .. .. .. .. ... .. ..
Figure 4B
Geologic Cross-section B-B’
City of Arroyo Grande
Cleath-Harris Geologists
Explanation
Note: SP14 geophysical survey point was not measured
Ground surface
Estimated lithologic boundaries
Geophysical survey pointSP05
B-B’ Cross-section location Figure 1
Northwest Southeast
B B’
Distance (feet)Elevation (feet above sea level)Arroyo Grande CreekBranch Mill RoadHuasna RoadMonterey Fm. Shale
AlluviumPismo
Fm.
SP16 SP15 SP13 SP12 SP10
SP08 SP07
SP11 SP09 SP06 SP05
Item 11.b. - Page 16.... .... .... C> LO ...... .... .... .... .... I I I I .... .... ' \ \ J / I I I I I I \ \ ' ' ' I I I I I I I C> C> ...... ' ' ' ' I J J J I I \ I \ \ I I C> LO C> C> LO ~ C> C> C> ~ C> C> LO ...... C> C> C> ...... C> C> LO 1 I I
Item 11.b. - Page 17Explanation
Image Source; Google, 20 17
• Well with city water rights D Strother Park
O Adjacent well (WC R number) D Arroyo Grande City Limit
o Geophysical survey point D Parcel
~ Proposed well site -Cross-section line
Figure 5
Well Site and Cross-section Location
City of Arroyo Grande
Cleath-Harris Geologists
Strother Park Well Siting Report 3/6/2019 7
Underlying Older Geologic Formations
The Pismo Formation Squire member is mapped to northwest of Arroyo Grande Creek
Valley and the Monterey Formation chert member is mapped to the southeast of Arroyo
Grande Creek Valley (Figure 3). No geologic structural attitudes are shown in the Pismo
Formation northwest of Strother Park on the published geologic map but previous CHG
studies determined that Pismo Formation beds dip to the west-southwest at 20-30 degrees
near Pearwood Avenue. A 100-foot long and 10-foot high outcrop of Monterey
Formation porcelaneous shale was observed in the Arroyo Grande Creek bank adjacent to
Strother Park (striking North 80 East and dipping 63 degrees to the north) but was not
exposed on the west bank of the creek.
The Pismo Formation is described as a green siltstone in the well log at 1161 Huasna
Road and as sandy siltstone and very fine grained sandstone in outcrop along Pearwood
Avenue. Groundwater of sufficient yield for the City demands (75 gpm or more) was not
encountered within the Pismo Formation in test holes drilled on the Canyon Crest
development west of Huasna Road.
The Monterey Formation siliceous and porcelaneous shales have yielded up to 100
gallons per minute to wells drilled in the hills to the southeast of Arroyo Grande Valley.
Groundwater produced from the Monterey Formation often is sulfurous with a high total
hardness but can be less saline than the alluvial waters. Oil staining in the fractures of the
porcelaneous shales in the creek embankment indicate that natural gases or naturally
occurring oil may be encountered along with the water. The Monterey Formation
porcelaneous shales are projected to be encountered between 300 and 500 feet depth near
the end of the parking lot at Strother Park, adjacent to Arroyo Grande Creek.
PROPOSED WELL LOCATION AND WELL DESIGN
After reviewing the hydrogeology, water quality and various constraints pertaining to
Strother Park, a well location near the restrooms is the preferred site for an alluvial well.
The well location is shown on Figure 5. A deeper well constructed into the Monterey
Formation at the park and wells constructed on the southeast side of Arroyo Grande
Creek valley would not be of sufficient yield, or have the potential for poor quality, or are
substantially greater in cost to deliver to the park.
A well at the restrooms site is anticipated to reach bedrock at a depth of about 100-110
feet. This well could either be completed into a shallow alluvial aquifer, a deep alluvial
aquifer or both. Given the anticipated depth of these aquifers, it is possible to place the
well screen below 55 feet, which would allow for a 50-foot annular seal that would to
conform to State Well Standards without requiring a variance.
Item 11.b. - Page 18
Strother Park Well Siting Report 3/6/2019 8
Figure 6 shows the preliminary construction diagram for an irrigation well at Strother
Park. Tables 1 and 2 provide a preliminary well design and a cost estimate for the
irrigation well at Strother Park. The unequipped well is estimated to cost $70,000.
Sincerely,
CLEATH-HARRIS GEOLOGISTS, INC.
Timothy S. Cleath, Certified Hydrogeologist #81
President
Item 11.b. - Page 19
CHG
8-inch diameter, PVC F480, SDR 21
blank well casing from surface to 55 feet
8-inch diameter, PVC F480, SDR 21
blank well casing from 110 to 120 feet
Annular seal
50 feet depth
55 feet depth
120 feet depth
PVC end cap
ground surface
Drawing not to scale
Sand filter pack:
Cal-Silica (8x16)
16-inch diameter borehole
PVC slip cap
Figure 6
Strother Park Shallow Irrigation Well
Preliminary Construction Diagram
City of Arroyo Grande
Cleath-Harris Geologists
Final well head details not shown
110 feet depth
8-inch diameter PVC F480, SDR 21 screen,
0.040-inch slot perforations from 55 to
110 feet depth.
Item 11.b. - Page 20
Strother Park Well Siting Report 3/6/2019 10
Table 1
Preliminary Well Design Summary
Strother Park Irrigation Well
City of Arroyo Grande
Drilling Location: 1150 Huasna Road in Arroyo Grande (Strother Park)
Pilot hole depth: 140 feet
Geophysics: Spontaneous potential, long and short normal, 6-foot lateral, gamma ray.
Well depth: 120 feet
Final borehole size: 16-inch nominal diameter.
Completion: Blank casing from wellhead to 55 feet depth,
Slotted (high-density) casing from 55 to 110 feet depth,
Blank casing with end cap from 110 to 120 feet depth.
Centralizers: Every 40 feet within screened interval. Every 60 feet in blank interval.
Blank casing: 8-inch nominal diameter, F480 SDR 21 PVC water well casing.
Screen: 8-inch nominal diameter, F480 SDR 21 PVC water well casing with
high-density 0.040-inch slots.
Gravel pack: Cal-Silica sand (8 x 16), or approved equal.
Sanitary Seal: 50 feet cement-based annular seal.
Wellhead: Slip cap pending final pump design and installation.
Air-lift Development: 6 hours
Pump development: 8 hours. Test pump set at 300 feet, capable of 100 gpm from 300 feet.
Pump test: 4-hour step (assume 20, 40, 60, and 80 gpm). 8-hour constant discharge
(assume 50 gpm).
Cuttings Pile: Removed for disposal by contractor.
Drilling fluids: Removed for disposal by contractor.
Item 11.b. - Page 21
CHG
Strother Park Well Siting Report 3/6/2019 11
Table 2
Bid Sheet with Estimate
Strother Park Irrigation Well
City of Arroyo Grande
Item Item (includes installation) Units Quantity
Unit
Price
Item
Price
1 Construction Permit Lump Sum 1
Lump
Sum $1,000
2 Drilling Rig Mobilization/Demobilization Lump Sum 1
Lump
Sum $10,000
3 Drill Test Hole
Lineal
Foot 140 $40 $5,600
4 Geophysical Logs Lump Sum 1
Lump
Sum $3,500
5 Ream to 16-inch diameter
Lineal
Foot 120 $75 $9,000
6 8-inch PVC, F480, SDR 21, Blank Casing
Lineal
Foot 65 $65 $4,225
7
8-inch PVC, F480, SDR 21, screen, 0.040
slot
Lineal
Foot 55 $55 $3,025
8 Centralizers Each 3 $150 $450
9 Filter Pack (8x16) cubic yard 4 $250 $1,000
10 Sanitary Seal (50 feet) Lump Sum 1
Lump
Sum $3,500
11 Air-Lift Development Hour 6 $400 $2,400
12 Install/remove pump Lump Sum 1
Lump
Sum $2,000
13 Pump Development Hour 8 $200 $1,600
14 Step Test Hour 4 $200 $800
15 Constant Discharge Test Hour 8 $200 $1,600
16 Vacuum Truck Each 6 $2,300 $13,800
17 Drilling Fluids/cuttings disposal Lump Sum 1
Lump
Sum $2,500
18 Production Water disposal (sprinklers) Lump Sum 1
Lump
Sum $3,000
Total
$69,000
Item 11.b. - Page 22
CHG
Strother Park Well Siting Report 3/6/2019 12
APPENDIX
Item 11.b. - Page 23
CHG
Item 11.b. - Page 24
i --r
RECORDING REQUESTED BY
AND WHEN RECORDED RETURN TO:
CITY OF ARROYO GRANDE
CITY CLERK
300 E. BRANCH STREET
ARROYO GRANDE CA 93420
Fee Exempt per GC Sections 6103 and 27383
'2017015973
Tommy Gong d San Luis Obispo -County Clerk-Recor er
04/12/2017 11:22 AM
Recorded at the request of
PUBLIC
Titles: 2
Fees: $0.00
Taxes: $0.00
Total: $0. 00
Pages: 12
1111 i:lffil.ifill~l.11111
GRANT AND AGREEMENT
RE: WATER RIGHTS, FACILITIES
The attached GRANT AND AGREEMENT, made and entered into by and between
1189 FLORA ROAD, LLC, a California limited liability company, and the CITY OF
ARROYO GRANDE, a municipal corporation of the State of California, was approved
by Arroyo Grande City Council Resolution No. 4676 on July 28, 2015.
Item 11.b. - Page 25
GRANT
AND AGREEMENT
RE: WATER RIGHTS, FACILITIES
""" TIIIS GRANT AND AGREEMENT ("Agreement') is entered into effective this 27 ctay
of March, 2017, between 1189 Flora Road, LLC, a California limited liability company
("FLORA"), as the owner of certain rights in the real property more particularly described in
Exhibit "A" and by this reference hereby incorporated (the "Property''), and the City of Arroyo
Grande ("City'').
RECITALS
1. WHEREAS, FLORA is the owner, by reservation, of certain water rights, and
related water facility easements at the Property (the "Water Rights");
2. WHEREAS, City is desirous of acquiring FLORA's Water Rights.
3. WHEREAS, there currently exists upon the Property, an existing well (the "Existing
Well") which allows for providing water for the use of the Owners and/or the occupants of the
Property (hereinafter collectively the "Occupants"); which also provides water for all of the
agricultural uses for which the Property can now or hereafter be utilized (the "Agricultural Uses").
For purposes of this Agreement, Occupants shall also include tenants utilizing the Property for
Agricultural Uses. The approximate location of the Existing Well is depicted on Exhibit ''B" (the
"Well Site") and by this reference is hereby incorporated. FLORA's water rights at the Existing
Well are limited to only that water produced at the Existing Well which exceeds the demands
and/or requirements of the Occupants and the Agricultural Uses at the Property (hereinafter the
"Excess Water")
NOW TIIEREFORE for valuable consideration hereby acknowledged, and upon the terms
and conditions contained herein, FLORA does hereby grant and convey to the City: (1) the right to
Item 11.b. - Page 26
take and remove FLORA'S Excess Water as produced or otherwise available from the Existing
Well and/or the Well Site; (2) a non-exclusive easement for removing the water produced
therefrom as more particularly hereafter described (the "Underground Easement") ; and, (3) such
additional non-exclusive easements as reasonably required at the Well Site for installation and
maintenance related water pipes, conduits and related improvements, as necessary and for
production and transfer of the Excess Water from the Well Site for the purpose of all allowable
uses, in accordance with the terms of this agreement.
THE PARTIES HEREBY AGREE AS FOLLOWS:
1. FACILITY LOCATION: That the locations of Existing Well, Well Site and
Underground Easement and other matters are depicted on Exhibit "B" attached to this agreement.
2 UNDERGROUND EASEMENT: The Underground Easement shall be a ten (10) foot
wide easement in favor of the City, for the installation, maintenance, repair and replacement of
underground water lines, conduits, utility systems and related underground improvements (the
''Underground Facilities"), and for reasonable ingress and egress to the Underground Facilities
within the Underground Easement area ( for purposes of pumping, obtaining, and conveying
Excess Water from the Existing Well off the Property, at the Underground Easement location
shown on Exhibit "B" and by this reference hereby incorporated.
3. ALLOW ABLE USES: Allowable uses for the Excess Water shall be any and all lawful
uses for the public benefit including use by the City at Strother Park.
4. PROPERTY WATER REQUIREMENTS: FLORA and the City agree that the
Occupants of the Property, and all Agricultural Uses shall have a priority right to water produced at
the Existing Well and the Well Site for as much water as is required to meet the needs and/or
requirements of the Occupants at the Property, and the Agricultural Uses being conducted at the
Property (collectively the "Property Water Requirements"). The Parties acknowledge and agree that
all Property Water Requirements must be satisfied before any Excess Water exists and that City, in
exercising any rights hereunder, shall ensure that the Property Water Requirements are met and
satisfied before taking and using any Excess Water.
5. COivfMON WELL FACILITIES: The common well facilities shall consist of the
Existing Well, as more particularly shown on Exhibit "B", the well casing, pump, electrical service
Item 11.b. - Page 27
lines, the existing generator and other related equipment as necessary for the production of water at
the Well Site. (hereinafter "Common Well Facilities")
6. MAINTENANCE OF WELL AND FACILITIES:
(a) Common Well Facilities: Once the City exercises its rights to utilize the Excess Water
under this Agreement, the City shall thereafter pay all costs and expenses associated with
maintaining the Common Well Facilities in proper working and sanitary order and operating the
Common Well Facilities for so long as it is possible to procure and distribute the Excess Water
from the Existing Well. These operation and maintenance obligations shall not be construed to
include obligations with respect to the quality of water that may be produced at the Existing Well,
and are hereby limited to operating and maintaining the Common Well Facilities in good working
order and repair;
(b) Pump and Power System: While the Existing Well remains powered by an on-site
electric generator, the costs of maintenance and operation of such generator shall be deemed a part
of the Common Well Facilities under this Agreement. In the event that the Well Site is hereafter
served by a metered electrical utility service provider, the City shall ensure that there are two (2)
separate metered installations, consisting of (a) a meter measuring the City's electric use at the
Well Site; and (b) a meter measuring all electric use associated with meeting the Property Water
Requirements. Following the installation of such electric services and both of these meters, the City
shall not be responsible for the electrical expenses and charges associated with the pumping of the
Property Water Requirements.
(c) Replacement Well: As part of the City's obligation to maintain the Common Well
Facilities, the City shall have the obligation to drill a replacement well and place it in operation if
the Existing Well should sand up or become inoperative and it is reasonably possible to drill
another well within the Well Site as the same is more particularly shown on Exhibit "B."
(d) Original Users: Notwithstanding anything otherwise stated in this Agreement to the
contrary, the parties hereby acknowledge and agree that the Occupants of the Property are currently
the only users of the Existing Well and the Common Well Facilities (the "Original Users"). Until
the City makes any installations of conduit, piping or other improvements so as to allow the City to
enjoy the rights herein conveyed, the Original Users shall be solely responsible for all repair,
Item 11.b. - Page 28
maintenance, costs and expenses associated with operating the Existing Well.
7. INDIVIDUAL WATER SYSTEMS: Both the City and the Original Users shall have
the right to install, maintain and repair pipelines, conduit, valves, timers and other well and water
equipment and facilities at the Existing Well site, at the installing parties sole cost and expense to
enjoy their respective rights. Any such installations by the Occupants, or for purposes of the
Agricultural Uses associated solely with the distribution of the Property Water Requirements, shall
not be considered a part of the Common Well Facilities.
8. WELL REPAIR AND REPLACEMENTS: In the event that the pump, or other
Common Well Facility equipment fail(s), or deteriorate(s) to a condition that requires repair, or
replacement for purposes of meeting the Property Water Requirements (hereinafter collectively
referred to as "well failure"), the City shall exercise all reasonable and best efforts in order to cause,
commence and diligently pursue the repair of the Existing Well and/or Common Well Facilities
within 24 hours of either written or telephonic notice of the well failure.
9. CITY'S RIGHT TO RELINQUISH: The City shall have the right to relinquish all rights
granted hereunder, and thereby terminate all future obligations hereunder EXCEPT ANY
OBLIGATIONS ARISING UNDER PARAGARPH 14, by express unequivocal and unambiguous
written notice directed to FLORA, together with a recorded Quitclaim Deed reconveying the City's
rights hereunder to FLORA. All future obligations of the City with respect to the operation and
maintenance of the Common Well Facilities under this agreement will be extinguished upon
delivery of such notice and recorded deed, however the City shall remain liable for all costs and
expenses associated with the Common Well Facilities which accrued through the date of the
delivery of the notice and recorded deed.
10. PROPERTY OWNER'S OTHER WATER RIGHTS: Nothing contained herein shall
be considered as any limitation upon, or conveyance of, the right of the owners of the Property, or
their authorized agents, or tenants to drill any and all new wells which the owners deem necessary
for any legal use at the Property.
11. WATER LINES. PIPES, AND CONDUIT: The City and the Occupants shall each be
solely responsible for the maintenance of their separate pipes, conduits and equipment which serve
solely to distribute their water as produced by the Common Well Facilities. In the event of a
Item 11.b. - Page 29
material leak of pipe failure the City shall have the right to perform any such repairs reasonably
necessary to protect the Common Well Facilities at the City's sole cost and expense.
12. NO GUARANTY AS TO QUALITY OR OUANillY: FLORA does not and cannot
make any warranty or guaranty concerning the quantity or quality of the Excess Water which may
be available to the City hereunder, or concerning the continuing availability of such Excess Water.
City understands and hereby acknowledges that FLORA is not a public utility, is not guaranteeing
any specific quantity or quality of water, is not the sole owner of the water rights subject to this
agreement, and is not the owner the underlying Property.
13. LANDSCAPING, IMPROVEMENTS: City acknowledges that the Occupants have
the right to improve, landscape or otherwise utilize all portions of the Property immediately
surrounding the Existing Well, the Well Site, and above the Underground Easement, so long as
such use does not unreasonable interfere with the rights of the City herein conveyed. In the event
that the City's installations, repairs, maintenance or any other servicing of the Common Water
Facilities or the City's underground water and utility systems, as installed pursuant to Paragraph 2,
effect or otherwise damage any such Property improvements, landscaping or other use, the City
shall be responsible, at the City's sole cost and expense, to return such improvements, landscaping
to the same condition they enjoyed prior to the commencement of such repair, service or other
work by the City.
14. INDE:rvtNITY: HOLD HARMLESS: This Agreement is made on the express
condition that FLORA is to be free from all liability with respect to any claim for damages by
reason of any injury to any person or persons, or any injury to property of any kind whatsoever and
to whomever belonging, from any cause or causes whatsoever, while in, upon or in any way
connected with the City's exercise and enjoyment of the City's rights under this Agreement, other
than those arising from the intentional or grossly negligent act of FLORA.
City hereby covenants and agrees to indemnify and save harmless FLORA from all liability,
loss, cost and obligations (including, without limitation, reasonable attorney's fees and expenses),
on account of or arising out of any such injuries or losses, however occuning.
15. ASSIGNMENT AND BINDING ON HEIRS: This Agreement shall be binding on
the parties hereto and on their successors-in-interest, and shall run with the land.
Item 11.b. - Page 30
16. NOTICES: Any and all notices or other matters required or permitted by this
Agreement or by law to be served on, given to, or delivered to either party hereto by the other party
to this Agreement shall be in writing and shall be deemed duly served, given, or delivered when
personally delivered to the party to whom it is directed, or, in lieu of such service, when deposited
in the United States mail, first-class postage prepaid to:
FLORA:
CITY:
1189 FLORA DRIVE, LLC
684 Higuera Street, Suite B
San Luis Obispo, CA 93401
City of Arroyo Grande
Attn: Kelly Wetmore, City Clerk
3 00 E. Branch Street
Arroyo Grande, CA 93421
With copy to:
Heather Whitham
CARMEL & NACCASHA LLP
1410 Marsh Street
San Luis Obispo, CA 93401
or at such address, and to such addressee( s) as the parties or their successors shall hereafter
provide the other by notice in accordance with this paragraph. In the event that any parties'
successor(s) in interest fail to provide such addresses to the other, then notice may be directed by
publication under applicable statutory law.
Whereas the Parties have executed this Agreement effective as of the date first written
above.
1189 FLORA ROAD, LLC:
By: Tompkins Trust .....s
Dated November 14, 2007
Managing Member,
Nicholas J. Tompkins, Trustee
Item 11.b. - Page 31
APPROVED AS TO FORM AND LEGAL
EFFECT:
4~~~
Heather K. Whitham, City Attorney
Item 11.b. - Page 32
ACKNOWLEDGMENT
A notary public or other officer completing this certificate verifies only the identity of the-individual
who signed the document to which this certificate is attached, and not the truthfulness, accuracy, or
validity of that document.
STATE OF CALIFORNIA )
) ss
COUNTY OF SAN LUIS OBISPO )
On Maro,21, 2011 (date), before me, M1ruele A .Tompk1'os, Notary
Public, personally appeared ' a.s J"". k..lfl S ,
who proved to me on the basis of satisfactory evidence to be th~Rerson"8' whose name~ isL ~
~~scribed to the within instrument and acknowled~R to. me tha~)[e/th,ey executed the same in
~¢'.Ith®" authorized capacity(ip), and that by~/thefr signature(~ on the instrument the
person~ or the entity upon behalf of which the person(p1' acted, executed the instrument.
I certify under PENAL TY OF PERJURY under the laws of the State of California that the
foregoing paragraph is true and correct.
WITNESS my hand and official seal.
~ (Seal)
Description of Attached Document
Title or Type of Document: amn± Qni,{ 4_,runaeo f
Document Date: Mo,v::rb 27 J 2o I 7
Item 11.b. - Page 33
ACKNOWLEDGMENT
A notary public or other officer completing this certificate verifies only the identity of the individual
who signed the document to which this certificate is attached, and not the truthfulness, accuracy, or
validity of that document.
STATE OF CALIFORNIA )
) ss
COUNTY OF SAN LUIS OBISPO )
On A~ri / 5 (Jo t? (date), before me, /(i-H:!:J J1t>r/4K.. , Notary
Public, perso ally appe~ed A.~/a~T J14C. rq// ,
who proved to me on the basis of satisfactory evidence to be the personEs1 whose name(~ is/ai&
subscribed to the within instrument and acknowledged to me that hetsfte,1~ executed the same in
his/Mf,~ authorized capacity(-ies,, and that by his/1,ei:}tbrlt ..,ignature(~ on the instrument the
person~ or the entity upon behalf of which the personEs1 acted, executed the instrument.
I certify under PENALTY OF PERJURY under the laws of the State of California that the
foregoing paragraph is true and correct.
WITNESS my hand and official seal.
•
NORTON ·
COlllllllnlan • 2099808 i _, Mlle • Clllfornla
(Seal) ) Sin lull o.llpo County ..
. Mar 9. 2019 uouuo!tl-.lllllxzuuuuf
Description of Attached Document
Title or Type of Document: C2t"4n± % d..
Document Date:
Item 11.b. - Page 34
..
EXHIBIT "A"
PARCEL 1 OF PARCEL MAP AG-79-022, IN THE CITY OF ARROYO GRANDE, COUNTY OF SAN LUIS
OBISPO, STATE OF CALIFORNIA, ACCORDING TO THE MAP RECORDED JUNE 10, 1982 IN BOOK 32, PAGE
25 OF PARCEL MAPS, IN THE OFFICE OF THE COUNTY RECORDER OF SAID COUNTY.
Item 11.b. - Page 35
EXHIBIT ,, B"
POINT "8" ---~
P.O.T. STRIP #1
P.0.8. STRIP #3
POINT "A"
P.0.8. STRIP #2 S5Z00'29"E 49.71'
L □-r 6 ' N37'59'31 "E 40. 19'
" P.O.T. STRIP #2
9 1\IJB 32
LEGEND:
R RECORD PER 32-PM-25
M MEASURED
P.O.C. POINT OF COMMENCEMENT
P.0.8. POINT OF BEGINNING
T.P.0.8. TRUE POINT OF BEGINNING
P.O.T. POINT OF TERMINUS
T.P.0.8. STRIP #1 PARCEL ·J
32 pjyj 25
80
I--,
GRAPHIC SCALE
0 40 80 ·
e---1 I I 1 inch = BO feet
MICHAEL B. STANTON, PLS 5702
3563 SUELDO ST. UNIT Q
SAN LUIS OBISPO, CA 93401
805-594-1960
9.99 AC
160
I □
PLAT
OF EXISTING WELL AND UNDERGROUND
EASEMENT
September 3, 2015 JOB #15-019
END 9F DOCUMENT
Item 11.b. - Page 36""""" ... ,-.. wtttiOWA -., o...,.,.,. """ ~ ~ 1w. ''·°" 1k ·• .74-l S t,.W 1--20-U L<:,n1 h-, , .. ,. , .J;aA-Laia-obi.apo Co "01S 16l-I J1r,IIO,, "v.1.1. c(l~11•1..1:1·10N ·n,~PORT ,. ,. .. 0962373 I w.,,,:.c;t-'~ [ -~ "',.,..""' • '~• I l ""''I JI (;(0t()l..1(: ux. II. ->i""'" ...... -•• '" Hick ...Tolll.lcj_n.a ~~'°'' -· "· "'a\.~I,., 68fJ!io11ua_..st SuU,LJI =JtotHL ·-Mud SAD... LaJ i a Ob U.pa Cl JI C 4 14..0!..i -..: .. _.,.. • ocw • .,11, .... •·• H -. -i"• ... ' " "" , .. att.t HIC\Titl'\' " • -~ l•l.U-Flor-.l Rd . ~ .., ' Datkl3l'Mtr1 ~ ◄ ~•~ , o\.c~oyo, c;.und.__ c.a.ll.f --~ 2S , CJoy.J...l,~ .. _,, S.Ml~l--..o,bj.Cpo....CO.-J2f-10{ --60 ' Sand & Gravel "' .... ,. -I~• .00 ,_ 1.-6 1-0J.2. -. ~ ~ 6? Bh ck_£ h" -1) ...... , II . •• _§~ 98 Snnct., , Gra,v•l !~ ......... I , . ~ ~,. ... ~,. -98 1,s 81ackSJ.u_lf.i_t.h 1 '-H'Uto, •'-llll II \ltl\lf' ---X -«• -¥F;tUa>•-·· AKR6VIJ cllak ------· . ' ..:. ~c:J~/.1) ,_ .. ....,, . .-'1c':P" ---' .__.X.ll ' ' ' nl\ >!:I I~; ollifh' ...... _, ' --. •:.-. ' \ ., -·-. ' . ,._,_ . I • 1(~'kff:--'lte,1..t, . • -·-' . --. -I I -. --I-· • -u-. --. ----. ,,_ ~---,,. . _,, r. '• .. 'ii ·~-_,,.., . •. ,.-.h.rt,,·11ruuaW•t11.,,..,,r I-: 'IIIAll II UHi .. UI ID or Co\,ln 11.Tl'.D "'tU -re .... ·o-.,. .. •~ ~~It .. _ --_,.._ ,. , .. , ' • 38.5 -,..,t111tw> ..,_, .... , ........... ---&--1-4-i..-' 2S ' n ...... -.._., -•9"n"" .... ~ fOnl t>!:f"fll • .. l,, " Ju_, ._ ,1 ..... ,,,2.._ -•-""O"t DOIO'!I u lO'flJ &JUill I.It "'-1'111H.I •11t 1 ·-· W 1f1>_.,, __ -, r_o/_...,,.._,_...W. """ -·=, ,.,.. ":; f¼f-...... '''lU. \l\ll°lhL ---""' ----... !I J w--. "' ~ ·---"" -"'-l • .. -... ''""' ._ " • " l -~ ··-.. • " ~ -"•• ' -' ' ,~ •• • ..__1-soa . . . .. , -I-IUO----~ ..... ,_ . 1---(--... . ,.. .. . -I I ·--\Tf~Clt\11 '\h I c.1no1tiwttn ~nn-.1,1 __, ... lN ... ..,._~._,.._..,,. • ...,__.....,._,_ _ _.,_.,~......,---.i -~o.r--. M<HI Tnl..Gf ~~-1},Uff• --0 2801 JJ,;l Rd ..... ---Karia caiu 9;J4S5 -~ --"-• &, ...... -~ ..,,,...~ .,,, .... .,,1,5 8.U:-:_ff6_ --~--... ,.._..,,,..,._,., ,. , ... . -· ---
TAYLOR DRILLING AND PUMP
2801 Mahoney Rd. Santa Maria CA
Lic # C57-523-858
NKT
1189 Flora Rd 7/31/15
Static Water Level : 38.5’
Time Flow Draw Down Pumping level
30min 75gpm 15.5’ 54’
60min 75gpm 15.5’ 54’
90min 75gpm 15.5’ 54’
120min 75gpm 15.5’ 54’
150min 75gpm 15.5’ 54’
180min 75gpm 15.5’ 54’
The well was test pumped with a submersible test pump set at 80’.
Sincerely,
Sam Taylor
Item 11.b. - Page 37
Item 11.b. - Page 38
Jun 061612:25p
ft
I
-
I
!
==
--
Arroyo Water Well Supply 8055741530 p.1
ARROYO WATER WELL SUPPLY . .
--.--j -
I ] .D
DESCRIPTION
TO; NKT COMMERCIAL
684 HIGUERA, SLO 93401
TELEPHONE:541-9004 ext 200
FAX#: 290-4440
1 189 FLORA RD. A.G ..
PRICE
WELLPUMP mode(75GS30 H.P.3 ---pH 1 VOLTAGE230 2,594.00
capacity 7 5 GPM@u..a_ ft. T D.H ................................... .
CABLE siz.e 12/ 4 length 80 ft. ................................... l.1.6 .. .8.0 ..
SCH120.
DROP PIPE type PVC srae 2" length 8 O ft ...................... 544 .. 00 ..
SANITARY SEAL size6x2 in ............................................ 1.25,..og ..
STORAGE TANK type___ size ___ gal ......•... , ............................. .
BOOSlER PUMP model ___ .H.P. __ pH __ VOLTAGE ___ ............. .
capacity ___ GPM@ ____ ft. T.D.H. . . . . . . . . . . . ........ ' .... .
PRESSURE TANK size ___ •.........••••.••• , .•.•...•.•.••.••••..•..••••.•....•.•.
FflTING PACKAGE ..... ; .......... ' ............... ' . . . . . . . . . . . . . . . . . . . . ... ? ?.0. ~ 9 P .•.
MISC. FlTIINGS ...•.........•.•......................................................
LOW WATER CUT-OUT (electrodes & wire) .............................................. .
'ELEC1RICAL . . . . . . . . . . . . . . . . . . . . . . . • . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............ .
SAFE1Y SWITCH ...........................•........... , .............. .
WEl..L TEST ...............................................•...........
I • I I a o a • • a ■ • • a O I I I • I • I •• o • ,o I O I O O • I ••• 0 • • • ■ • " • o I O • • • 0 • • • o I • I • ' o o • o • ■ • I o • 0 a •• t 0
I , f ■ • • • o • • • • I • ' O • o • • • • • • O I • I o • • o • o , 4 o o t o , , • ., , • • a, • 0 0 • • o. • • • ■ 0 ., • • • t t ♦ • t ._ • • 0 • ■ • • •
• • • • • o • ■ ■ • • • • • o I••• o • • • ••••••••I I•• t • • ■ ■■ ■ ""' • • o ■ • • • • • • • • ■ •., t • • •., • • • • • o • •• ■ • ••
ARROYO WATER WELL SUPPLY:
.
P.O. Box 157
Arroyo Grande, CA 93421
Telephone: 805/489-22S8
FAX No.: 805/489/ 91 _
-I _.
~ub Total .•.•• -~~~~~:~-~ ..
Sales Tu •••••••• J!.9. Q ,. ).e ..
lnstallation ••....• 19 9.•. q9 .•.
rI'OTAL PRICE~!.~~~:.~~-..
SUBMIITED BY . .L,,.,.JJ..Ad..t&~~~:;:;;;':..b_~~e&:~-""'---------
DATE: JUNE 6 2016
THIS ESTIMA 1E IS 000D FOR 30 DAYS.
TERMS OF PAYMENT: NET 30 DAYS. 1 1/2% per month will be -charged on all past due accoun1S.
ACCEPTEDBY: __________ =~--------------
CUSTOMER."S -SIGNATURE
Corporate Offices & Laboratory
853 Corporation Street
Santa Paula, CA 93060
TEL: (805)392-2000
Env FAX: (805)525-4172 / Ag FAX: (805)392-2063
CA ELAP Certification No. 1573
Office & Laboratory
2500 Stagecoach Road
Stockton, CA 95215
TEL: (209)942-0182
FAX: (209)942-0423
CA ELAP Certification No. 1563
Office & Laboratory
563 E. Lindo Avenue
Chico, CA 95926
TEL: (530)343-5818
FAX: (530)343-3807
CA ELAP Certification No. 2670
Office & Laboratory
9415 W. Goshen Avenue
Visalia, CA 93291
TEL: (559)734-9473
FAX: (559)734-8435
CA ELAP Certification No. 2810
Office & Laboratory
3442 Empresa Drive, Suite D
San Luis Obispo, CA 93401
TEL: (805)783-2940
FAX: (805)783-2912
CA ELAP Certification No. 2775
ENVIRONMENTAL AGRICULTURAL
Analytical Chemists
Lab ID : CC 1582721-001August 25, 2015 Customer ID : 8-449Ron Taylor Drilling
2801 Mahoney Rd
Santa Maria CA 93455
Sampled On : August 4, 2015
Sampled By : Client
Received On : August 5, 2015
Matrix : Ag Water
Description :AG Nick Tompkins
Project :Ag Water Monitoring
General Irrigation Suitability Analysis
Test Description Result Graphical Results Presentation
Cations Good
Possible
Problem
Moderate
Problem
Increasing
Problem
Severe
Problemmg/L Meq/L % Meq Lbs/AF
Calcium 299 15 46 810 **
Magnesium 147 12 37 400 **
Potassium 6 0.15 0 16 **
Sodium 117 5.1 16 320
Anions
Carbonate < 10 0 0 0
Bicarbonate 670 11 34 1800 **
Sulfate 840 17 55 2300 **
Chloride 120 3.4 11 330
Nitrate 0.4 0.0065 0 1
Nitrate Nitrogen < 0.1 0
Fluoride 0.1 0.0053 0 0.3
Minor Elements
Boron 0.30 0.82
Copper < 0.01 0.00
Iron 0.65 1.8
Manganese 1.8 4.9
Zinc < 0.02 0.00
TDS by Summation 2200 6000
Other
pH 7.0 units
E. C.2.83 dS/m
SAR 1.4
Crop Suitability
No Amendments Poor
With Amendments Poor
Amendments
Gypsum Requirement 0.0 Tons/AF
Sulfuric Acid (98%) 38 oz/1000Gal Or 93 oz/1000Gal of urea Sulfuric Acid (15/49).
Leaching Requirement 25 %
Good Problem
Note: Color coded bar graphs have been used to provide you with ’AT-A-GLANCE’ interpretations.
** Used in various calculations; mg/L = Milligrams Per Liter (ppm) meq/L = Milliequivalents Per Liter
Item 11.b. - Page 39
August 25, 2015 Lab ID : CC 1582721-001
Customer ID : 8-449Ron Taylor Drilling Description : AG Nick Tompkins
Micro Irrigation System Plugging Hazard
Test Description Result Graphical Results Presentation
Chemical Slight Moderate Severe
Manganese 1.8 mg/L
Iron 0.65 mg/L
TDS by Summation 2200 mg/L
No Amendments
pH 7.0 units
Alkalinity (As CaCO3) 550 mg/L
Total Hardness 1350 mg/L
With Amendments
Alkalinity (As CaCO3) 110 mg/L
Total Hardness 110 mg/L
pH 5.4 - 6.7 units
Good Problem
Note: Color coded bar graphs have been used to provide you with ’AT-A-GLANCE’ interpretations.
Water Amendments Application Notes:
The Amendments recommended on the previous pages include:
Sulfuric Acid:
These products should be applied as needed to prevent emitter plugging in micro irrigation systems and/or as a
soil amendment to adjust soil pH to improve nutrient availability and to facilitate leaching of salts. Please exercise
caution when using this material as excesses may be harmful to the system and/or the plants being irrigated. The
reported Acid requirement is intended to remove approximately 80 % of the alkalinity. The final pH should range
from 5.4 to 6.7. We recommend a field pH determination to confirm that the pH you designate is being achieved.
This application is based upon the use of a 98% Sulfuric Acid product. The application of Urea Sulfuric Acid is
based upon the use of a product that contains 15% Urea (1.89 lbs Nitrogen), 49% Sulfuric Acid and has a specific
gravity of 1.52 at 68 F.
Guidelines for the above interpretations are sourced from USDA & U.C. Cooperative Extension Service publications.
Please contact us if you have any questions.
FRUIT GROWERS LABORATORY, INC.
SB1:KDM
Scott Bucy, Director of Ag. Services
Item 11.b. - Page 40
Corporate Offices & Laboratory
853 Corporation Street
Santa Paula, CA 93060
TEL: (805)392-2000
Env FAX: (805)525-4172 / Ag FAX: (805)392-2063
CA ELAP Certification No. 1573
Office & Laboratory
2500 Stagecoach Road
Stockton, CA 95215
TEL: (209)942-0182
FAX: (209)942-0423
CA ELAP Certification No. 1563
Office & Laboratory
563 E. Lindo Avenue
Chico, CA 95926
TEL: (530)343-5818
FAX: (530)343-3807
CA ELAP Certification No. 2670
Office & Laboratory
9415 W. Goshen Avenue
Visalia, CA 93291
TEL: (559)734-9473
FAX: (559)734-8435
CA ELAP Certification No. 2810
Office & Laboratory
3442 Empresa Drive, Suite D
San Luis Obispo, CA 93401
TEL: (805)783-2940
FAX: (805)783-2912
CA ELAP Certification No. 2775
ENVIRONMENTAL AGRICULTURAL
Analytical Chemists
Lab ID : CC 1582721-002August 25, 2015 Customer ID : 8-449Ron Taylor Drilling
2801 Mahoney Rd
Santa Maria CA 93455
Sampled On : August 4, 2015
Sampled By : Client
Received On : August 5, 2015
Matrix : Ag Water
Description :Lompoc Victor S.
Project :Ag Water Monitoring
General Irrigation Suitability Analysis
Test Description Result Graphical Results Presentation
Cations Good
Possible
Problem
Moderate
Problem
Increasing
Problem
Severe
Problemmg/L Meq/L % Meq Lbs/AF
Calcium 75 3.7 46 200 **
Magnesium 22 1.8 22 60 **
Potassium 4 0.1 1 11 **
Sodium 59 2.6 31 160
Anions
Carbonate < 10 0 0 0
Bicarbonate 190 3.1 37 520 **
Sulfate 110 2.3 27 300 **
Chloride 102 2.9 34 280
Nitrate 3.8 0.061 1 10
Nitrate Nitrogen 0.9 2
Fluoride 0.2 0.011 0 0.5
Minor Elements
Boron 0.10 0.27
Copper < 0.01 0.00
Iron < 0.03 0.00
Manganese 0.10 0.27
Zinc < 0.02 0.00
TDS by Summation 566 1500
Other
pH 7.0 units
E. C.0.930 dS/m
SAR 1.5
Crop Suitability
No Amendments Fairly Good
With Amendments Fairly Good
Amendments
Gypsum Requirement 0.03 Tons/AF
Sulfuric Acid (98%) 11 oz/1000Gal Or 27 oz/1000Gal of urea Sulfuric Acid (15/49).
Leaching Requirement 7.1 %
Good Problem
Note: Color coded bar graphs have been used to provide you with ’AT-A-GLANCE’ interpretations.
** Used in various calculations; mg/L = Milligrams Per Liter (ppm) meq/L = Milliequivalents Per Liter
Item 11.b. - Page 41
~ •
I
I
August 25, 2015 Lab ID : CC 1582721-002
Customer ID : 8-449Ron Taylor Drilling Description : Lompoc Victor S.
Micro Irrigation System Plugging Hazard
Test Description Result Graphical Results Presentation
Chemical Slight Moderate Severe
Manganese 0.1 mg/L
Iron < 0.03 mg/L
TDS by Summation 566 mg/L
No Amendments
pH 7.0 units
Alkalinity (As CaCO3) 160 mg/L
Total Hardness 278 mg/L
With Amendments
Alkalinity (As CaCO3) 32 mg/L
Total Hardness 32 mg/L
pH 5.4 - 6.7 units
Good Problem
Note: Color coded bar graphs have been used to provide you with ’AT-A-GLANCE’ interpretations.
Water Amendments Application Notes:
The Amendments recommended on the previous pages include:
Gypsum:
This should be applied at least once a year to the irrigated soil surface area. Gypsum can also be applied in
smaller quantities in the irrigation water. Apply the smaller (bracketed) amount of gypsum when also applying the
recommended amount of Sulfuric Acid and the larger amount when applying only Gypsum.
Sulfuric Acid:
These products should be applied as needed to prevent emitter plugging in micro irrigation systems and/or as a
soil amendment to adjust soil pH to improve nutrient availability and to facilitate leaching of salts. Please exercise
caution when using this material as excesses may be harmful to the system and/or the plants being irrigated. The
reported Acid requirement is intended to remove approximately 80 % of the alkalinity. The final pH should range
from 5.4 to 6.7. We recommend a field pH determination to confirm that the pH you designate is being achieved.
This application is based upon the use of a 98% Sulfuric Acid product. The application of Urea Sulfuric Acid is
based upon the use of a product that contains 15% Urea (1.89 lbs Nitrogen), 49% Sulfuric Acid and has a specific
gravity of 1.52 at 68 F.
Guidelines for the above interpretations are sourced from USDA & U.C. Cooperative Extension Service publications.
Please contact us if you have any questions.
FRUIT GROWERS LABORATORY, INC.
SB1:KDM
Scott Bucy, Director of Ag. Services
Item 11.b. - Page 42
Item 11.b. - Page 43-~:='-4'; (tma~
~NVl}iONMENTAL ,i(~ .. ::·!\GRICULTURAL
? .•l: (·~l•~H~
·---:-f.:i i"v"invi ii· ii:i lll;L .;;;;;_~-,,CiniCu01uiv;i..,
Analytical Chemists
Client: Ron Tavlor Drillina
Customer Number: 8000449
Address: 2801 Mahonev Rd
Santa Maria CA 93455
Phone: (805)680-2128 Fax:
Email Address:
Contact Person: Ron Tavlor
Project Name:
Purchase Order Number:
Quote Number:
Sampler(s):
(Zt_/CNr'
Sampling Fee: Pickup Fee:
Compositor Setup Date: Time:
I Sampl Location Description Date I
Sampl;:d Num
H(<f;-N ~ 10~ \~
"' ~V/t)(./,
a
Time
Sampled
/
/ 1:JJrZ P6U1~ ~~ ~· /' ,. \ ,~
y ... ,.
CHAIN Of' CUSTODY
www.fgUnc.com
wwwfglinc. com CHAIN OF CUSTODY
AND ANALYSIS REQUEST DOCUMENT
/J Lab Number: /-
-_//D~ ~/ TEST DESCRIPTION AND ANALYSES REQUESTED
I
i=-
~
.! §' 3'
0.. i= g_§' s
E .mo fl ~ ii ~ a-OJ
~ ~1 a:: a::
~gi £ ~ u
§ ~ §' ~ I-g :c
$ C> ::;;z
§
g_ "'Cl 6:l!J
.&:I I~ ~ ID e ·= ~ e; ~ 0.. :co 0 i is ~E ~ ~ iI i=-Q: $f 9 G ~ LLJ c=:;C"'i ~ ~ _c:::,
~ gi ID !:!!. a:: s Cl) .N
·;;; !:!!. UV)
8. § ~ '6 jij ~ 'cu iio1 "2!~ a:. ·E =! OJ 8. ell NZ ~ !,! I= j Cl) U) ::s ~ +ra-:a :i~ 0 ~ :c -~ 6' U) i=-~ a, I!? C> 3:: = o..-i" ,! t -~
_.
~ ::, 8!. Ill 0 id 0.. iai" !:!!. 0 zz :s Cl. ~ Cl) g ~ s ~ -:c s ::::,
E .5 z ID t:::. :!! =r ~§: ·3 ,Y.
~ ~ Ii -g ~ (/) u
-~ 0.. Cl) ·a '6 'cS 8 ~ vi ~ ::::, ~~ C 0 !:!!. ~ g~ 0 G)
"8 .8 '6 OJ ~i §; U) ii I= ii ii = E i I 's i:l '.a ell :c Cl E OJ ::, ~~ Ill !I I!!-:§ QI "== z U) CD CD U) 0..~ (/)
G { AgW ...-x X
G I AgW -X
~ -I -A .r; ~ PY/ 1n ~ I/Jr,; -----I ['-.......
Remar~~ -r~L-, s---z-:-&rr-7&6& G1
c-~ILaboratoN
8 -~ reet
S81~~-93080' Ag FAX: (805)392-2063
p~lJ~ftti2'lllt19· 1573
Env Fax: (805) 525-4172 / Ag Fax: (805) 392-2063
,
(_,
~
-✓ • • \ /'\\. A'\..f-. ; Tin,e• -L, . ~, r,(_,A-/..,.. J Ti,...c:._ Relinquished Date:--~ ~/ ~{) ltEj~ . -
~ I /rW/Vl~J7~ 't::;;~/(5 !i/ ~)-A,;~ffk, r,rfc r~
~~' .•~
\{ i e: Re~ived1i;/
'?)y,vf./(/(77 htlitAh . u I
Ti63(i3~dGs 1 s
~lt0l~:S6SDS
~ '(59~lfs-~&~70
Fax: (530) 343-3807
n~ m=
J '-,/ '
Sa .. --·---·-,.,-, TEl31fti!;jiBJPleG Drive, Suite D
FA)61fffl>mffi3Ql1~o, CA 93401
CAp~~l9'B~P284CP
Fax: (805) 783-2912
l;>ate:
Ch 1 lo -
Time: ...............
,6fu
..;;
Item 11.b. - Page 44
FGL Environmental
Revision Date: 10/09/14
I Doc ID: 3D0900002_SOPi_12.DOC
I
(j Page 1 of 1
Inter-Laboratory Condition Upon Receipt (Attach to CO 1 Sample Receipt at: STK CC CH VI
· 1. Number of ice chests/packages received: / Shipping tracking # ------i----2. Were samples r~ceived in 1:!-chilled condition? Temps: __ / __ / __ / ;
Surface water SWTR bact samples: A sample that has a temperature upon receipt of > 10° C, whdther iced or not, should be flagged· unless the time since sample collection has been less than two· hours.
3. Do the number of bottles received agree with the COC? (¥is) No N/A 4. Were samples received intact? (i.e. no broken bottles, leaks etc.) ~ No
5. VOAs checked for Headspace? Yes No ~ 6. Were sample custody seals intact? Yes No A 7. If required, was sample split for pH analysis? Yes No A 8. Were all analyses v-,ithln holding times at time of receipt? @ No 9. Verify sample date, time and sampler name ~ No
Sign and date the COC, :place in a ziplock and p~~~ ice chest as the sampl Sample Receipt Review completed by (initials):~ ·
Sample Receipt at SP: · I c:=::.
1. Were samples received in a chilled condition? Temps: ~/_:___"-.J_/ __ / ;
Acceptable is above freezing to 6 ° C. If many poacµges are receiv~ 0~ ~e ~ec~o:,. t~Yf{q;~s/~es/ 2. Sbippingtrackingnumbers: Q\'l) \t:f6\1~•~,v CJ.,t
3. Do the number of bottles received agree with the COC? ~10 NIA 4. ; Were samples received intact? (i.e. no broken bottles, leaks etc.) ~o ~ 5./ Were sample custody seals intact? Yes N, \t!!!J ifign and date the COC, obtain LTh1S sample numbers, select methods/tests and prin labels. I
/Sample Verification, Labeling and Distribution:
t .I.
2. Did bottle labels correspond with the client,s ID's?
3. Were all bottles requiring sample preservation properly preserved?
[Exception: Oil & Grease, VOA and Cr VI verified in lab] 4. VOAs checked for Head.space? Yes
5. Have rush or project due dates been checked and accepted?
6. Were all analyses v-,itbin holding times at time of receipt?
Attach labels to the containers and include a copy of the COC r
Sample Receipt, Login and Verification completed by (initials., .,·_,_"""I,-_
Discrepancy Documentation:
~FGL
~
.Any items above which are "No~' or do not meet specifications (i.e. temps) must be r solved .. 1. Person Contacted: Phone Number: ----+----. Initiated By:,______________ Date: ____ ~ Problem:
Resolution:
2. Person Gontacted:. _________ _
Initiated By: _________ _
Problem:
Resolution:
(Please use the back of this sheet for additional comn
contacts)
li1. --_ i.. T ••..• 1. -··• ( tj-4 ~}
Ron Taylor Drilling
CC 15$2721
NMP-0a;06;2d1s-0a:s9:24
I
Geophysical survey TM 1 1/22/2019
Technical Memorandum
Date: January 22, 2019
From: Spencer Harris, HG 633
To: City of Arroyo Grande
Subject: Passive Seismic Geophysical Survey for Strother Park Well Siting
Study, City of Arroyo Grande
In August 2018, Cleath-Harris Geologists (CHG) completed a well siting study for the
City of Arroyo Grande. As part of that study, CHG performed a preliminary passive
seismic geophysical test at the end of the parking lot at Strother Park that indicated a
depth to bedrock of 75 feet. Although this depth could be sufficient for a park irrigation
well, additional geophysical surveying was requested by the City to provide more support
for the well siting study. This technical memorandum presents the results of the
additional surveys.
Background
The City is considering constructing a new water well at 1150 Huasna Road in Arroyo
Grande (Strother Park). A water well at Strother Park could serve to irrigate the park or
potentially to provide a source for potable water to the City. The City also owns other
parcels and road right of ways adjacent to the park that were reviewed as options for
groundwater development.
The 2018 Well Siting Report reviewed the hydrogeology, water quality and various
constraints pertaining to developing a well at Strother Park and concluded that a well
location at the end of the parking lot holds potential for either a shallow well or a deep
shale well that would have the capacity to provide water for park irrigation, although
water quality could be an issue. The option to utilize an existing deeded water right at a
well across Arroyo Grande Creek from the park, or to site the new well across the creek,
was recommended for further evaluation using non-invasive geophysical methods.
Geophysical Surveys
Two geophysical surveys were completed to support the well siting study (Figure 1).
Each survey is comprised of multiple survey points (SP's), numbered sequentially along
Item 11.b. - Page 45
Cleath-Harris Geologists, Inc.
71 Zaca Lane , Suite 140
San Luis Obispo, CA 93401
(805) 543 -1413
CHG
Item 11.b. - Page 46Explanation
Image Source: Go og le, 2017
• Well with city water rights D Strother Park
0 Adjacent well (WCR number) D Arroyo Grande City Limit
o Geophysical survey point D Parcel
~ Proposed well site -Cross-section line
Figure 1
Location Map
Geophysical Survey TM
City of Arroyo Grande
Cleath-Harris Geologists
Geophysical survey TM 1/22/2019 2
the survey line. The first survey was performed at Strother Park, providing data between
the original geophysical test location and Huasna Road. The second survey was
performed along Coach Road between Arroyo Grande Creek and Branch Mill Road.
Passive Seismic Geophysics Method
The horizontal to vertical spectral ratio (HVSR) passive seismic geophysical method
relies on the observation that all materials in nature have a natural resonance frequency.
When energy-induced vibrations interact with a material, the amplitude of vibrations
increase at the specific resonance frequency of the material. In complex earth systems,
this amplitude increase will occur at multiple frequencies, with each corresponding to a
compositional layer. When the spectral ratio of horizontal to vertical frequencies are
plotted, the highest (peak) amplitude generally corresponds to the interface between
overlying unconsolidated sediments and underlying consolidated bedrock. By analyzing
the amplitude and frequencies of vibrations at ground surface, the depths and general
composition of layers can be modeled to provide insight into subsurface conditions.
The HVSR method can be valuable for several reasons. The first is that it is relatively
unaffected by conditions which may preclude other geophysical methods, such as the
presence of metallic objects (power lines, pipes, and agricultural wire trellis) which can
impact both magnetic and transient electromagnetic methods. No cables or lines along
the ground are required for the HVSR method, which reduces the operational impacts that
other geophysical methods can have.
To collect data, a high precision accelerometer is utilized. As the instrument records, it
detects natural background noise from varied sources including ocean waves, traffic,
wind movement through trees, and distant machinery. Both the frequency and
amplitudes of this sound is recorded along three orthogonal axes. This data is used to
approximate subsurface conditions with a model.
The simplest of these models is a two layer system in which the upper layer is lower
velocity unconsolidated sediments and the lower layer is higher velocity bedrock. Under
these conditions, the relationship between the peak resonance frequency and sediment
thickness overlying bedrock can be express using the following equation1.
ƒൌ ఔ
ସ
For the above equation, ƒ is resonance frequency in hertz, ν is the shear wave velocity of
the upper layer in meters per second, and ݄ is the thickness of the upper layer in meters.
With this method, a recording is taken adjacent to a well where h is known, and the data
processed to identify ƒ, the peak resonating frequency. The equation is then used to
determine the velocity ν of pressure waves through the sediment. This velocity may then
1 Ibs-von Seht, M., and Wohlenberg, J., 1999, Microtremors measurements used to map thickness of soft
sediments, Bulletin of the Seismological Society of America, v. 89, p.250-259.
Item 11.b. - Page 47
CHG
Geophysical survey TM 1/22/2019 3
be held constant to determine thickness (h) at nearby locations where no well is present,
but measured resonance frequencies are available.
Strother Park Survey
The initial test location (SP00) from August 2018 was interpreted as indicating a depth to
bedrock of approximately 75 feet depth (see 2018 Well Siting Report). Passive seismic
data at four additional test locations (SP01 through SP04) were collected in November
2018. Pertinent results of the Strother Park passive seismic geophysical survey are
presented in Figure 2 and Table 1. An updated to geologic cross-section A-A' from the
2018 Well Siting Report is shown in Figure 3. HVSR traces for all the test sites are in the
Appendix.
Table 1 ‐ Geophysical Survey Results
Geophysical
Survey
Point
Frequency
at Peak
HVSR
Amplitude
Sediment
Shear
Wave
Velocity
Bedrock
Depth
(HVSR
Optimized)
Ground
Surface
Elevation
Bedrock
Elevation
(HVSR
Optimized)
[Hz] [m/s] [ft] [ft] [ft]
Strother Park Survey
SP00 2.5 270 77 157 80
SP01 1.8 270 107 159 53
SP02 3.1 270 62 160 97
SP03 3.1 270 64 160 96
SP04 2.9 270 67 161 94
Coach Road Survey
SP05 1.88 210 82 170 88
SP06 2.34 210 66 167 102
SP07 2.47 210 62 170 107
SP08 2.69 210 57 169 111
SP09 3.53 240 51 160 109
SP10 2.31 270 85 153 67
SP11 1.88 270 102 152 50
SP12 2.16 270 92 152 60
SP13 2.91 270 67 153 85
SP14 (location not accessible)
SP15 9.31 270 21 156 135
SP16 11.2 270 18 154 136
Item 11.b. - Page 48
CHG
I I
base of
alluvium
base of
alluvium shallow alluvium
shallow alluvium
shallow alluvium
base of alluvium
(maximum depth
in proximity)
Pismo Fm. absent
Pismo Fm. contact with
Monterey Fm. in proximity
Pismo Fm. contact
with Monterey Fm.
fully developed
SP00
SP01
SP02
Figure 2
Strother Park HVSR Data
Geophysical Survey TM
City of Arroyo Grande
Cleath-Harris Geologists
Item 11.b. - Page 49
Max. HN at 0.19 ± 0.04 Hz . (In t he ra nge 0.2 -64 .0 Hz ). 8.----=--------,..,.--------------~-------------------------,
7
6
5
4
3
2
-,---,-·
-_,_ ----.J-_,_
' '
' ' ' ---,------,--,--
-!... ---- -_,_ -.J-_, __ ,_ -
I ' ' ' ' t I -Ave rage HN I ,
0'------~--~---------~-----------------------~----------' 0.1 1 10
fr equencv [Hz)
Max. HN at 1.81 ± 0.11 Hz . (In t he range 0.2 -64.0 Hz ). 8~-------------------------------------------------------~
7 --······· ' ' ' • I • •••••• 1 .••• •'• • •• l ••• 1 ••• •-J. •'••'•. -•
I I I I I • I
' '
_,_ ----_,_ ---'---_,_ -_,_ -J. _, __ ,_ ---
' I I I I I I I ·-1-Av erage HN I :
6
-·. -,-"t. ···1··-··· ---,-
I
<
5
4
3
2
1
'I
- -◄ - - - - - -... - --,--• --,- -,-- - -- -◄ - - - - -
I I I I
. -:--·;· -,---,-·, --,--
'
. -:--·<
' ' ' ----,---.---,--,-
0'------~--~---------~----------~-----------------------' 0.1 10
f requen cv fHzJ
Max. HN at 2 .5 ± 0.16 Hz . (In th e range 0.2 -64 .0 Hz ). 8~-------------------------------------------------------~
' ' ' I I I I I • I I
7 -------------I.. - - --- - -I.. - - - --:-- - -~ - --:---:--~ --:--~ -
6
5
4
3
2
1
"t"
'
-·t ·
'
' ' ' -... ---1---,-,--1--r--
' I I I I
--;----,--
-, -,-"t"
' ' ' --_,_ - -!.. - -_,_ -_,_ -J -_, __ ,_ -
I I I I I I I
' ' ' I I ' I -,--------.------,----,---,---,---, -, -,
--j -Av erage HN I-~
-,--' . 'I
' ' ' ·< ---,-------,-----j•---
o~-----~--~----------~-------------------------~---------~ 0.1 10
frequen cv [Hz)
Estimated lithologic
boundaries
Ground surface
geophysical survey point
A-A’ Cross Section Location, Figure 1.
Well ID
Explanation
Well
Screen
Distance (feet)Elevation (feet above sea level)0 200 400 600 800 1000 1200
180
120
-120
0
60
-60
Northwest
Southeast
A
A’
Pismo Fm.
siltstone / sandstone
Monterey Fm.
shale
Alluvium
Alluvium
porcelaneous shale bed
Dip
°NE63
Proposed Shallow and
Deep Well Sites
Shallow WellDeep Well(500 feet total depth)Figure 3
Geologic Cross-Section A-A’
Geophysical Survey TM
City of Arroyo Grande
Cleath-Harris Geologists
Huasna Rd.
E063592
SP00SP01
SP01
SP02
(projected)Arroyo Grande CreekStrother Park
The anticipated base of the alluvium is 100 feet depth.
Proposed total well depth is 110 feet depth.
Shallow Well:
Deep Well:The anticipated top of the porcelaneous shale contact is
300 feet depth. Proposed total depth of deep well is 500 feet.
Item 11.b. - Page 50
-I-
I -
I I I I r ·"' '"' -~-----~
\ ; '---' ;
; ' ; ' ,,,
~p '~ ,,, ---------------------,,, ----,, --,,
I >, / ... ' .. •· ' I .... ' I .. •·· \ I I -.. ' / '--•••• •·· '...,J,:. ;
,,, . .. .. .. I .. .. .. .. I .. .. .. .. .. .. .. I .. .. .. ..
I -.. I-.. .. .. . .. .. ..
I .. .. .. ..
I .. .. .. .. .. .. .. .. I ...
-I I-.
I
I .
I
1, I
I I I I I I
=~
Geophysical survey TM 1/22/2019 4
The deepest part of the buried alluvial channel is interpreted to be in proximity to SP01.
The HVSR trace for SP01 indicates the base of the alluvium has a relatively sharp peak
frequency of 1.81 hertz (Hz), compared to the August 2018 test at SP00, where the peak
frequency was 2.5 Hz. Assuming the lithology and associated shear wave velocities in
the alluvial deposits are similar between the two locations, and a depth to bedrock of 75
feet at SP00 (from prior work), the corresponding depth to bedrock at SP01 would be
estimated at 107 feet.
Farther northwest of along the survey line, the frequency ratio associated with the base of
the alluvial deposits increases to over 3 Hz at SP02, corresponding to an estimated depth
of 62 feet. Note that there is a new peak frequency around 0.25 Hz at SP02, which is
interpreted to be associated with the contact between the Pismo Formation and
underlying Monterey Formation (Figure 3). The recommended shallow well site has
been moved close to SP01, with a 50-foot setback from sewer pipes associated with park
restrooms.
The estimated depths are expected to be within 15 percent of actual depths, based on the
observed variability when applying alternative shear wave velocities and comparing the
results of Open HVSR software with the simple analytical solution described above.
Open HVSR software was used for frequency-matching optimization2.
Coach Road Survey
A series of passive seismic tests were conducted along the Coach Road right-of-way
between Arroyo Grande Creek and Branch Mill Road (SP16 to SP05). Pertinent results
of the Coach Road geophysical survey are presented in Figure 4 and Table 1. HVSR
traces for all the test sites are in the Appendix. Geologic cross-section B-B' shows the
interpreted profile on the base of the alluvial deposits (Figure 5)
The deepest part of the buried alluvial channel along Coach Road is interpreted to be in
proximity to SP11. The HVSR trace for SP11 indicates the base of the alluvium has a
relatively sharp peak frequency of 1.88 Hz. Assuming the lithology and associated shear
wave velocities in the alluvial deposits are similar along the deepest portions of the
buried alluvial channel (i.e. between SP02 and SP11), the corresponding depth to bedrock
at SP01 would be estimated at 109 feet.
Farther northwest along the survey line, toward Huasna Road, the frequency ratio
associated with the base of the alluvial deposits increases to over 11 Hz at SP16,
corresponding to an estimated depth of 20 feet (Figure 4). A new peak frequency around
2 Bignardi, S., Yezzi, A.J., Fiusello, S., and Comelli, A., 2018, OpenHVSR - Processing toolkit; Enhanced
HVSR processing of distributed microtremor measurements and spatial variation of their informative
content, Computers & Geosciences, v. 20, p. 10-20.
Item 11.b. - Page 51
CHG
Figure 4
Coach Road HVSR Data
Geophysical Survey TM
City of Arroyo Grande
Cleath-Harris Geologists
SP16
SP11
SP09
SP05
base of
alluvium
base of
alluvium
(local bedrock high)
base of alluvium
(secondary channel)
base of alluvium
(maximum depth
in proximity)
Pismo Fm. contact with
Monterey Fm. in proximity
Pismo Fm. absent
Pismo Fm. absent
Pismo Fm. absent
shallow alluvium
shallow alluvium
shallow alluvium
shallow alluvium
Item 11.b. - Page 52
Max . HN at 11 .19 ± 5.64 Hz . (In th e range 0.2 -64 .0 Hz ).
B~------------------~--------------~----~~---------------~
·, ·,
' ' ' --_,_ • -• L •-_,_ -_,_ -.J -_, __ ,_ -
I I I • I
--, -,--
j -Av erage HN I :
I I I I -,·······-,·-----,----.---...
·,. ·,-
I
7
6
5
4
3
2
1
·<
' I • ' ' ' ' ' - --,----r - --,---.--, --,- -,--
o~----~--~---------~----------~------------~--------~
0 .1 1 0
f requen cy [Hz}
Max. HN at 1.88 ± 0.12 Hz . (In t he range 0.2 -64.0 Hz ). B~--------------~-------~-------~-------------------~
7
6
5 -,--,-
- --·'----L --_,_. _1_ --_, __ ,
' '
-,
' ' 4
3
------------------------•----___ , __
-,--
2
1 ----------
___ , ____ ._ __ . ___ , __ .J __ , __ , __
I • l < l I-Av erage HN I ,
' ' . ---,----.. ----:··1 ·1
--◄ - ---.. --- --_,_ --_, __ ,_ ---
' ' '
·;·
o~-----~--~----------~-----------------------------------~
0 .1 10 fr eq uen cy [Hz}
Max. HN at 3.53 ± 1.01 Hz . (In t he range 0.2 -64 .0 Hz ). 8~-------------------------------------------------------~
7
6
-,-· -,-
--.•. ---L --.•. ----.J_ .• •• 1. -
' I ' I
. -, -,-·
' . ' --_,_ ----_, ____ '---_, ___ ,_ -.J __ , __ ,_ -
' ' . ' ' ' ' ----1-Av erage HN I :
··-·;·--··-· ·,--, -,-· ·--..
I
5
4
3
2
1
' 'I
- - - -◄ --- -< -,-· .. -,-· . -,-·
o~-----~--~----------~-----------------------------------~
0.1 1 1 0 fr eq uen cy [Hz}
Max. HN at 1.88 ± 12.55 Hz . (In t he range 0.2 -64 .0 Hz ). 8~-------------------------------------------------------~
--·'· ---L .-·'· __ , __ .J. ·'· ·'· -
I I I • t
-!.. --_,_ -_,_ -.J-_, __ ,_ -
I ' I I ' t · -j -Av erage HN I ~
' ' . -,---1--,--,--,--
·,----..
7
6
5
4
3
2
' ' ' 'I
--4 --• ------,----,--,--
I I I I
I I < I < -.----,---,---,--.---·,--
'
o~----~--~---------~--------------------------------~ 0.1 1 10
frequen cy fHzJ
Figure 5
Geologic Cross-section B-B’
Geophysical Survey TM
City of Arroyo Grande
Cleath-Harris Geologists
Explanation
Note: SP14 geophysical survey point was not measured
Ground surface
Estimated lithologic boundaries
Geophysical survey pointSP05
B-B’ Cross-section location Figure 1
Northwest Southeast
B B’
Distance (feet)Elevation (feet above sea level)Arroyo Grande CreekBranch Mill RoadHuasna RoadMonterey Fm. Shale
AlluviumPismo
Fm.
SP16 SP15 SP13 SP12 SP10
SP08 SP07
SP11 SP09 SP06 SP05
Item 11.b. - Page 53.... .... .... C> LO ...... .... .... .... .... I I I I .... .... ' \ \ J / I I I I I I \ \ ' ' ' I I I I I I I C> C> ...... ' ' ' ' I J J J I I \ I \ \ I I C> LO C> C> LO ~ C> C> C> ~ C> C> LO ...... C> C> C> ...... C> C> LO 1 I I
Geophysical survey TM 1/22/2019 5
0.25 Hz is also beginning to take shape, suggesting proximity to the contact between the
Pismo Formation and underlying Monterey Formation.
Moving from SP011 to the southeast toward Branch Mill Road, the frequency ratios for
the base of the alluvium reaches a local high at SP09, which also corresponds to the edge
of a low alluvial terrace. The low terrace is triangular in shape, with the northwestern
corner extending to a bedrock outcrop in Arroyo Grande Creek, and is interpreted to be
underlain by a higher percentage of alluvial clay deposits than elsewhere in the alluvium,
based on a well log located on the terrace. Adjustments to the shear wave velocity based
on a higher clay percentage have been applied to the interpretation of data from SP05
through SP08. A small secondary buried channel appears to have developed near SP05
(Branch Mill Road).
Base of Alluvial Deposits
The information from the geophysical survey has been used to update the base of
permeable sediments map (Figure 6). The deepest portion of the buried alluvial channel
appears to extend through Strother Park in the proximity of SP01 and through Coach
Road in the proximity of SP11. This interpretation is consistent with the deep buried
channel having been constrained by a hard porcellaneous shale bed and associated
topographic rise which lies between Strother Park and Branch Mill Road.
Item 11.b. - Page 54
CHG
Item 11.b. - Page 55
E I t • Image Source: Hall 1973, Geol ogy of the Arroyo xp a na 100 Grande quadrangle, San Luis Obispo County, California
o Geophysi cal survey point
(base of alluvium elevation)
-Contour line (ba se of alluv ium elev ation)
• Well with log (base of alluvium elevation)
• Bedrock outcrop in creek All elevations in feet
Figure 6
Base of Alluvium
Geophysical Survey TM
City of Arroyo Grande
Cleath-Harris Geologists
Geophysical survey TM 1/22/2019
APPENDIX
Item 11.b. - Page 56
CHG
Appendix
Geophysical Survey TM
1
SP00
SP01
SP02
SP03
Item 11.b. - Page 57
Max . HN a t 2.5 ± 0.16 Hz . (In th e ra nge 0.2 • 64 .0 Hz). 8---------------------------------------------~
7 ·····------·· - -_,_ -_,_ -J -_, __ ,. - - - - - - - - - - - -_,_ - - - - - -_,_ - - - -.,_ - - -~ - -.,_ -_,_ -J -_, __ ,_ - - - - - - - - - - - -
' ' ' ' ' ' ' ' ' ' ' ' ' '
6 .......... -.. ' ' ' ' ' ' --.,. -.,. -~ -., .. ,. ------------.,. ------.,. ----... ---~ --... -.,. -~ -., .. ,. ------------. . . -------.,. ----~ ---.,. --
5 ........... -.. ' ' ' ' ' ' ' ' ' ' ' ' ' ' ------------------------------------------------------------------------' ' ' ' ' ' ' ' ' ' ' ' ' '
. . . ---------------------. . .
4 ····-------··
3 ........... -.. ' ' ' ' ' ' ' ' ' ' ' ' ' ' ------------------------------------------------------------------------' ' ' ' ' ' ' ' ' ' ' ' ' '
. . . ---------------------. . .
2 ---·---·--~ --·-... ---------' ' ' ' '
. ----.,_ ---~ --.,_ --·--~ --·- -·------------- --------·-----~ ---... --
' ' ' ' ' '
' ' ' . · · · · · · · · · · - · ·r · · · · · · ·r · · · · ·,· · · · r -
o L _ _:· _ __:_· _i' _:._' _i__:_i__.:..i.:=-_ _i___~~~:'.!:::t:'.:::'.:~===:::±'.~~::'.::J
0.1 10 frea ue ncv [Hz)
Max . HN at 1.81 ± 0.11 Hz . (In th e range 0.2 • 64 .0 Hz ). 8~--------------------------------------------------~ ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' . : '. ' 7 · · · · · · · · · · · · ·: · · · · · · ·: · · · · ·:· · · ·: · · ·:· · ·:· · :· ·:· ·: · · · · · · · · · · · · ·:· · · · · · · ·:· · · · · :· · · ·: · · :· · ·:· · :· ·:· ·:· · · · · · · · · · · · · i -~verag.e Hf\{ I:·
6 ............. ~ ....... ~ ..... : .... ~ ... : ... , .. ~ .. , .. ,. ............. : ........ : ..... ~ .... ~ .. ~ ... , .. ~ .. , .. , ............. ~ ........ : ..... ~ .... ~ .. ~.
' ' ' ' ' ' ' ' ' ' ' ' ' .......................................................... ---..... .
' ' ' ' ' ' ' ' ' ' ' ' '
I
<
5
4
3
2
. . . . . . . . : I
••••••••••••--••••~••--••••••C•••••••••••••••••••--••••••••••••••C ••••--••--• -
.... : ..... ; .... ; .. ; ... : .. ; .. : .. : ............. ; ........ : ..... ; .... : ... ;. <
0 '------'----'----'--'--'--'--'-'-'------'---'----'--'---'--'-'--'--'------'----'---'---'----'-'
0.1 10 fr eauencv [Hz)
Max . HN at 0.28 ± 0.03 Hz . (In th e ra nge 0.2 • 64 .0 Hz). 8,------..,,....----------------------------------, ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' . . '. ' 7 · · · · · · · · · · -· ·: · · · · · · ·: · · · · ·:· · · ·: · · ·:· · ·:· · :· ·:· ·: · · · · · · · · · · · · ·:· · · · · · · ·:· · · · · :· · · ·: · · :· · ·:· · :· ·:· ·:· · · · · · · · · · · · · i -Averag.e Hf\{ I:·
6 .......... -.. ~ ...... ~ .... : .... ~ ... : ... , .. ~ .. , .. ,. ............. : ........ : ..... ~ .... ~ .. ~ ... , .. ~ .. , .. , ............. ~ ........ : ..... ~ .... ~ .. ~.
5 ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' -........................................................................................................ . ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' '
4 .......... -..•.......
3 ........... -..
' . . . . . . . . . . . : I
• • • • •!• • • •~ • • •O• • •O• • C• •O• •--• • • • • • • • • • • • •O• • • • • • • •O• • • • • ... • • •~ • • ... • •O• • C• •O• •O• • • • • • • • • • • • • ... ----• • •O• • • • • C• • • •--• • ... -. . . . . . . . . . . . . . . . . · .... : ... ;. <
2 .......... -..
O'-------------------------------------------__. 0.1 10 frea ue ncv [Hz)
Max . HN at 0.19 ± 0.05 Hz . (In th e ra nge 0.2 • 64 .0 Hz). 0-------,-----."'-----------------------------------~
7 .......... -..
6 ····-------··
5 ·····-------··
4 .......... -..
3 ·····-------··
2 .......... -..
' ' ' ' ' ' ' ' ' ' ' . : '. ' ··:··:·············:········:·····:····:··:···:··:··:··:·············j -~ve rage H/1{ I:·
' ' ' ' ' ' ' ' ' ' .. , .. ,. ............. , ........ , ........... ~ ....... , .. ~ .. , .. , ....................... , ..... ~ .... ,. .... .
. . . . . . . : I
•••--••••~••--••••••C•••••••••••••••••••--• •••••••••••••C••••--••--• -
. ; .... ; .. ; ... : .. ; .. : .. : ............. ; ........ : ..... ; .... : ... ;. <
' ' ' ' ' .. ,. ·r· ............ , ........ , ..... .,,. O'----------------------------------------------.., 0.1 10 frea ue ncv [Hz)
Appendix
Geophysical Survey TM
2
SP04
SP05
SP06
SP07
Item 11.b. - Page 58
Max . HN at 0.25 ± 0.08 Hz . (In th e ra nge 0.2 • 64 .0 Hz). 8,----,.,--~-....,,----..,.--------------------------------,
7
6
5
4
3 .............•.......
2 .............•.......
- -_,_ -_,_ -J -_, __ ,. - - - - - - - - - - - -_,_ - - - - - -_,_ - - - -.,_ - - -~ - -.,_ -_,_ - -_, __ ,_ - - - - - - - - - - - -
' ' ' ' ' ' ' ' ' ' '
' ' ' ' ' ' ' --.,. -.,. -~ -., .. ,. ------------.,. ------.,. ----... ---~ --... -.,. - -., .. ,. ------------
' ' ' ' ' ' ' ' ' ' ' -----------------------------------------------------------------------' ' ' ' ' ' ' ' ' ' '
. . . -------.,. ----~ ---.,. --
. . . ---------------------. . .
. . . ---------------------. . .
O'-----~-----~---~--------~-~-----~----~-------.., 0.1 10
fr eauencv [Hz)
Max . HN at 1.88 ± 12.55 Hz . (In th e ra nge 0.2 • 64 .0 Hz). 8~-----------------------------------------------~ ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' . : '. ' 7 -------------:-------:-----:----:---:---:--:--:--:-------------:--------:-----:----:--:---:--:--:--:------------· i -~verag.e Hf\{ I:·
6 -------------~ -------~ -----:----~ ---:---,--~--,--.. -------------:--------:-----~----~ --~---,--~--,- -,-------------~--------:-----~----~ --~-
5 . ---------- - --:--------:------:----; ---:---:--~ --:- -:--------------:--------:------:----; ---:---:--~ --:- -:--------------:--------:-----~ ----:----:-
I
<
. . . . . . . . . . . . . . : I
4 ----------- ------------------·----~ ---·---·--~ --·-----------------·--------·-----------~ -------·--~ --·- -·-----------------------·-----~ ------------
3
. . . . . . . . . . . . . . . . . . . . . .. : ... ;. <
2 .......... -. ·~ ..... ··:
o~-------~---~-~~-~~----~~----~---~~~-----------~---~ 0.1 10 frea ue ncv [Hz)
Max . HN at 2.34 ± 40 .32 Hz . (In th e ra nge 0.2 • 64 .0 Hz). 8---------------------------------------------~ ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' . . '. ' 7 -------------:-------:-----:----:---:---:--:--:--:-------------:--------:-----:----:--:---:--:--:--:-------------1 -Averag.e Hft{ 1:-
6 -------------~ -------~ -----:----~ ---:---,--~ --,--.. -------------:--------:-----~----~ --~---,--~ --,- -,-------------~--------:-----~ ----~ --~-
5 . ----------- --:--------:------:----; ---:---:--~ --:- -:--------------:--------:------:----; ---:---:--~ --:- -:--------------:--------:-----~ ----:----:-
. . . . . . . . : I
4 ····-------··-·······-··········-··········-·····-················· ----·-----------~ -------·--~--·- -·-----------------------·-----~------------
3
2
. . . . . . . . . . . . ;. <
O'-------------------------------------------__. 0.1 10 frea ue ncv [Hz)
Max . HN at 2.4 7 ± 0.45 Hz . (In th e ra nge 0.2 • 64 .0 Hz). 8---------------------------------------------------~
7 -------------~ -------~ -----:----~ ---:---:--~ --:--~ -------------:--------:-----
6 -------------~ -------~ -----:----~ ---:---,--~--,--.. -------------:--------:-----
5 . ---------- - --:--------:------:----; ---:---:--~ --:- -:--------------:--------:-----
4
3
2 ..... ···-·· . . ..•.............
' ' ' ' ' ' ' ' ' ' ' - - - - - - - - - - - --r - - - - - --r - - - --,-- - -r - --,---,-- , --,--r - - - - - - - - - - - --,-- - - - - --,-- - - -
- - - -~ - -.,_ --·--J --·- -·-- - - - - - - - - - - -' ' ' ' ' ' ~ve rage H/1{ I~·
' ' ' ' --------,-----~ ----.. --.. -
' ' ' ' ' ' -------------------------------' ' ' ' -----------------------' ' ' ' ' ' ' ' ' ' . . . : I --------·-----~------------
' ' ' ' ' ' -------------------------------' ' ' ' ' ' ·------·: ..... ; .... : ... ;. <
' ' ' ' ' ---,,---,--,--,--,---------------------.--O'-----~-----~---~--------~-~-----~----~-------.., 0.1 10 frea ue ncv [Hz)
Appendix
Geophysical Survey TM
3
SP08
SP09
SP10
SP11
Item 11.b. - Page 59
Max . HN a t 2.69 ± 0.3 Hz . (In th e ra nge 0.2 • 64 .0 Hz). 8---------------------------------------------~
7 ·····------·· - -_,_ -_,_ -J -_, __ ,. - - - - - - - - - - - -_,_ - - - - - -_,_ - - - -.,_ - - -~ - -.,_ -_,_ -J -_, __ ,_ - - - - - - - - - - - -
' ' ' ' ' ' ' ' ' ' ' ' ' '
6 .......... -.. ' ' ' ' ' ' --.,. -.,. -~ -., .. ,. ------------.,. ------.,. ----... ---~ --... -.,. -~ -., .. ,. ------------. . . -------.,. ----~ ---.,. --
5 ........... -.. ' ' ' ' ' ' ' ' ' ' ' ' ' ' ------------------------------------------------------------------------' ' ' ' ' ' ' ' ' ' ' ' ' '
. . . ---------------------. . .
4 ····-------··
3 ........... -.. ' ' ' ' ' ' ' ' ' ---------------------------------------------------' ' ' ' ' ' ' ' '
2
' ' ' ' ' --,,---,--,--,--,-------------
o~-------~---~-~~-~~----~~----~---~~~-----------~---~ 0.1 10 frea ue ncv [Hz)
Max . HN at 3.53 ± 1.01 Hz . (In th e ra nge 0.2 • 64 .0 Hz). 8---------------------------------------------------~ ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' . : '. ' 7 -------------:-------:-----:----:---:---:--:--:--:-----· · · · · · · ·:· · · · · · · ·:· · · · · :· · · ·: · · :· · ·:· · :· ·:· ·:· · · · · · · · · · · · · i -~verag.e Hf\{ I:·
6 ... ·-------.. ~ ....... ~ ..... : .... ~ ... : ... , .. ~· ., .. ,. ............. : ........ : ..... ~ .... ~ .. ~ ... , .. ~· ., .. , ............. ~ ........ : ..... ~ .... ~ .. ~.
5 ..... ------ -. • :• ...... • :• .... •:• ... ; .. •:• . •:• . ~ . •:• • :• ............ •:• ...... •:• .... •: • ... ; .. •: • . •:• . ~ . •:• •:• ............ •: • ------•:• ----~ ---• :• .. •: •
I
<
. . . . . . . . . . . . . . : I 4 .......... -.................. , .... ~ ... , ... , .. ~ .. , ................. , ........ , ........... ~ ....... , .. ~ .. , .. , ....................... , ..... ~ ........... -
3 . . . . . . . . . . . . .. ; .. ; ... : .. ; .. : .. : ............. ; ........ : ..... ; .... : ... ;. <
2 ··········-··'-·····"'
.......... -.. r ....... r ..... : .... ~ ... : ... : .. ~ .. : .. r ............. : ........ : ..... ~ .... ~ .. ~ ... ,:,_..,_.,...,,-..-. . . . . . . . . . . . . . . 0'-----~~-----~---~-------~~-~--~--~----~-------.., 0.1 10 frea ue ncv [Hz)
Max . HN at 2.31 ± 0.29 Hz . (In th e ra nge 0.2 • 64 .0 Hz). 8---------------------------------------------~ . . . . . . . . . . . . . . . . . . . . '. .
7 · · · · ·------· ·: · · · · · · ·: · · · · ·:· · · ·: · · ·:· · ·:· · :· ·:· ·: · · · · · · · · · · · · ·:· · · · · · · ·:· · · · · :· · · ·: · · :· · ·:· · :· ·:· ·:· · · · · · · · · · · · · i -Averag.e Hf\{ I:·
6 .......... -.. ~ ....... ~ ..... : .... ~ ... : ... , .. ~ .. , .. ,. ............. : ........ : ..... ~ .... ~ .. ~ ... , .. ~ .. , .. , ............. ~ ........ : ..... ~ .... ~ .. ~.
5 ........... -. •:• ...... •:• .... •:• ... ; .. •:•. •:•. ~. •:• •:• ............ •:• ...... •:• .... •:• ... ; .. •:•. •:•. ~. •:• •:• ............ •:• ...... •:• .... ~ ... •:• .. •:•
. . . . . . . : I
4 ····-------··--·······--··········~··········~·····--········· ···--····~··--······~···················--·------···----~---·--··--· -
3 ··••:••····••:•• .. ; .... ; .. ; ... : .. ; .. : .. : ............. ;. ______ .;. ____ ; ___ .: •.. ;. <
2 . . . . . ~-.~-. -, ., ...................... .
o~-------~---~-~~-~~----~~----~---~~~-----------~---~ 0.1 10 frea ue ncv [Hz)
Max . HN at 1.88 ± 0.12 Hz . (In th e ra nge 0.2 • 64 .0 Hz). 8-----------------------~---------------------------~
7 · · · · · · · · · · -· ·~ · · · · · · ·~ · · · · ·:· · · ·~ · · ·:· · ·:· · ~· ·:· ·~ · · · · · · · · · · .; · · · · · · + · · · · ~· · · ·~ · · ~· · + · ~· + + · · · · · · · · · · · · i -~verag.e HJ\{ I~·
6 ... ·-------.. ~ ....... ~ ..... : .... ~ ... : ... , .. ~· ., .. ,. ........ . . . . . . . . . . . .... , ........... ~ ....... , .. ~ .. , .. , ....................... , ..... ~ .... ,. .... .
5 . . . . . . . . . . . . . ................................................................. . . . . . . . . . . . . .
4 ····-------·············································
3
. . . . . . . . : I ............. ·~ .......... ~· ..................... ------···-· .. ~· .......... -. . . . . . . . . . . . ;. <
2 .......... -..•......
. . . . . . . . . . . ~~l!'l!!~~-~~~~-~-~~~---~""~~~ · · · · · · · · · · - · · r · · · · · · · r · · · · ·,· · · · r · · ·,· · ·,· · , · ·,· · r · · · · · · · · · · · · ·,· · · · · · · ·,· · · · · -,-· · · r · · .,, . · ·,· · , · ·,· ·,· · · · ·
0'-----~~-----~---~-------~~-~--~--~----~-------.., 0.1 10 frea ue ncv [Hz)
Appendix
Geophysical Survey TM
4
SP12
SP13
SP15
SP16
Item 11.b. - Page 60
Max . HN at 2.16 ± 0.05 Hz . (In th e range 0.2 • 64 .0 Hz). 8---------------------~-----------------------~
7 · · · · ·------· · · · · · ·'· · · · · · ·:· · ·:· · ~· ·:· ·~ · · · · · · · · · · · · ·' · · · · ·:· · · · · ~· · · ·~ · · ~· · ·:· · · ·~· ·~· · · · · · · · · · · · · j -Averag_e Hi\(
6 .......... -.. ' ' ' ' ' . ---.,. ----... ---~ --... -.,. -' ' ' ' -., .. ,. ------------... ------.,. ----~ ---.,. --
5 ........... -.. ' ' ' ' ' -----------------------. ' ' ' ' ' ' ' ' ' ' ----------------------' ' ' ' ' ' ' ' ' ' ' ---------------------------------------' ' ' ' ' '
4 ····-------··
3 ........... -.. ' ' ' ' ' ' ---------------------------------------' ' ' ' ' '
2 .......... -.. --·- -·-------------.,_ -------·-----~ ---... --' ' ' ' ' '
o~-------~---~-~~-~~----~~----~---~~~-----------~---~ 0.1 10 frea uencv [Hz)
Max . HN at 2.91 ± 0.09 Hz . (In th e range 0.2 • 64 .0 Hz). 8-------------------------~~------------------------~
7 -------------~ -------~ -----:----___ , ___ , __ J __ , __ ,. _____________ , __ _
' ' ' ' ' '
' ' ' ' ' ' ' . : '. ' ···:····:··:···:··:··:··:·············j -~verage H/1{ I:·
6 -------------~-------~-----:----' ' ' ' ' ' ' ' ' --... ---~ --... -.,. -~ -., .. ,. ------------... ------.,. ----~ ---.,. --.. -
5 . -------------:--------:------:----' ' ' ' ' ' ---------------------------· ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ---------------------------------------------------------' ' ' ' ' ' ' ' ' ' ' '
I
<
, , , , , , , , : I 4 .......... -..•.......•..... , ... .
3 . -------------:--------:------:----
.,._ ---~ -------·--~--·- -·-----------------------·-----~------------
.. ; .. ; ... : .. ; .. : .. : ............. ;. ------.:. ----; ___ .: ... ;. <
2
0'-----~~-----~---~-------~~-~--~--~----~-------.u 0.1 10 frea uencv [Hz)
Max . HN at 9.31 ± 0.76 Hz . (In th e range 0.2 • 64 .0 Hz). 8---------------------~-----------------------~ ' ' ' ' ' ' ' ' ' ' ' ' ' ' . . '. ' 7 -------------~ -------~ -----:---- ---:---:--:--:--:-------------:--------:-----:----:--:---:--:--:--:-------------1 -Averag.e Hft{ 1:-
6 -------------~ -------~ -----:----' ' ' ' ' ' ' ' ' ' ' ' ' ---,---,--~ --,--.. -------------,--------,-----.. ----~ --.. ---,--~ --,- -,-------------.. --------,-----~ ----.. --.. -
5 ·-------------:--------:------:----' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ------------------------------------------------------------------------------------------------' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' '
4 ····-----·······················
3 ·-------------:--------:------:----
, , , , , , , , , , , , : I ---·---·--~--·-----------------·--------·-----------~ -------·--~--·- -·-----------------------·-----~------------' ' ' ' ' ' ' ' ' ' ' ' ' ' ........... ;. ______ .;. ____ ; .... : ... ;. <
2 .............•.......•..... , ..
o~-------~---~-~~-~~----~~----~---~~~------~----~---~ 0.1 10 frea uencv [Hz)
Max . HN at 11 .19 ± 5.64 Hz . (In th e range 0.2 • 64 .0 Hz). 8---------------------------------------------------~
7 -------------~ -------~ -----:----- --·---·--J --·-_,. - - - - - - - - - - - --·-- - - - - --·-- - - -.,_ - - -~ - -' ' ' ' ' ' ' ' '
6 -------------~-------~-----:----' ' ' ' ' ' ---,---,--~ --,--.. -------------,--------,-----.. ----~ --
5 ·-------------:--------:------:----' ' ' ' ' ' ' ' ' ------------------------------------------------' ' ' ' ' ' ' ' '
4
3
2
------------------------·---- ---·---·--~ --·-----------------·--------·-----------~ --
' ' ' ' ' ' ' ' ' ------------------------------------------------' ' ' ' ' ' ' ' '
' ' ' ' . ' ' ' - --,---,--,--,--r-- - - - - - - - - - --,-- - - - - --,-- - - --,,-- --r - -
' ' ' ' ' ' ' ' '
··~··~·· ···········j -~verage Hi\( I~·
' ' ' ' ' --,- -,-------------.. --------,-----~ ----,. --.. -
' ' ' ' ' ' ' -----------------------------------------' ' ' ' ' ' ' , , , , : I --------------------·-----~------------' ' ' ' .;. <
' ' . ' ' --,--,--------------,,--------,-----,----
0'-----~~-----~---~-------~~-~--~--~----~-------.u 0.1 10 frea uencv [Hz)
Appendix
Geophysical Survey TM
5
Expanded Scale Traces
SP03
SP04
SP13
Item 11.b. - Page 61
Max . HN at 0.19 ± 0.05 Hz (in th e range 0.2 -64 .0 Hz). 40---------------------------------------------~
~verage H/1{
' ' ' ' ' ' ' ' ' --.,. -.,. -~ -., .. ,. ------------.,. ------.,. ----... ---~ --... -.,. -~ -., .. ,. ------------ -------.,. ----~ ---.,. --
' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' I --.,. -.,. -~ -., .... ------------.,. ------.,. ----... ---~ --... -.,. -~ -., .. ,. -------------------.,. ----~ ---... --
' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' '
' ' ' ' ' ' ' ' ' <
' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ---·---·--~ --·-... -------------·--------·-----.,_ ---~ --.,_ --·--~ --·- -·------------- --------·-----~ ---... --' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' '
frea uencv [Hz) 10
Max . HN at 0.25 ± 0.08 Hz (in th e range 0.2 -64 .0 Hz).
' ' ' ' ' ' ' ' ' ' ' ' '
10 --~------~--.. ~ .. -~-. -~-. i. -~--~-............ -~-...... -~-.... ; .... ~ .. ; .. -~-. i. -~--~-............. j -~vera~e H/1{ I;.
I -------_,. ------_,. ----,_.
' ' : ---:---:--~ --:--~ -------------:--------:-----~----~ --~---:--~ --:--:-------------~--------:-----~ ----~ --~-<
' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' . ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' . ' '
O'-----......... ------~---~-------......... ~-~--~--~----~-------.., 0.1 10 frea uencv [Hz)
Max . HN at 2.91 ± 0.09 Hz (in th e range 0.2 -64 .0 Hz) .
10 · -------------:--------:------:----; ---:---:--~ --:- -:--------------:------. . . . ; .. , .. -:-. , . -:--:-............ >----~_v_er_a-"'g_e _H_/1{,........
' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' I
' ' ' ' ' ' ' ' ' ' -' ' ' ' ' ' ' ' ' ' 5 -------------~ -------~ -----:----~ ---:---:--~ --:--~ -------------:· - - - -~ - -.,_ --·--J --·- -·-- - - - - - - - - - - -' ' ' ' ' '
________ , _____ J ____ ,. __
' ' ' -<
' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' '
0 '-----......... ------~---~-------~~-'----~--~----~-------.., 0.1 10 frea uencv [Hz)
THIS PAGE INTENTIONALLY LEFT BLANK
Item 11.b. - Page 62