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CC 2017-08-08_06b Presentation_2016 NCMA Annual Report Meeting2017 NCMA Technical Group Meeting with Agricultural Representatives July 21, 2017 1 Meeting Agenda Meeting Objectives NCMA TG Overview 2016 Annual Report Related Initiatives Participant Discussion Next Steps/Future Meetings Slide 2 2 Meeting Objectives Role of the Technical Group Findings from 2016 NCMA Annual Report Updated on related initiatives Others? 3 Santa Maria Groundwater Basin Adjudication Subject to ongoing Litigation since 1997 Division of the basin into three separate management areas Monitoring Program and Annual Report Formalized the division of the NCMA safe yield from the Gentlemen’s Agreement 4 Northern Cities Management Area Technical Group Groundwater monitoring and data collection sufficient to characterize: Land and water uses in the basin; Sources of supply to meet those uses; Groundwater conditions (including water levels and water quality); Amount and disposition of developed water supplies; and Amount and disposition of other sources of water supply in the NCMA. 5 Related Organizations Nipomo Mesa Management Area (NMMA) TG Twitchell Management Authority (TMA) Santa Maria Valley Management Area (SMVMA) San Luis Obispo County Flood Control and Water Conservation District Zone 3 Zone 1/1A 6 NCMA 2016 Annual Report Ag Representatives Meeting Paul Sorensen GSI Water Solutions, Inc. July 21, 2017 7 Presentation Overview 2016 Hydrology (Precipitation and Evapotranspiration) 2016 Water Demand Groundwater Basin Conditions Key Findings 8 Santa Maria Groundwater Basin Three management areas (NCMA, NMMA, SMVMA) Mandated monitoring program and Annual Report 9 Northern Cities Management Area City of Arroyo Grande City of Pismo Beach City of Grover Beach Oceano Community Services District Private Users 10 Hydrology Average annual rainfall – 15.6 inches Rainfall in 2016 – 15.05 inches Below average rainfall in 7 of 12 months ET exceeded rainfall in all months except January and December 11 NCMA Agricultural Land 2016 12 Estimated Ag Pumpage 2016 13 NCMA Pumpage from SMGB 2016 14 NCMA Total Demand 2016 15 Historical NCMA Demand 16 Locations of Monitoring Wells 5 coastal well clusters 16 wells total 17 Groundwater Levels Spring 2016 18 Groundwater Levels Fall 2016 19 NMMA Groundwater Levels Spring 2016 20 NMMA Groundwater Levels Fall 2016 21 Historical April Deep Well Index 22 Key Findings Total 2016 NCMA Water Use – 8,108 AF Lopez Lake – 2,610 AF State Water Project – 1,907 AF Groundwater – 3,511 AF Other Groundwater – 79 AF Groundwater pumping is 37% of 9,500 AFY safe yield Water levels still in decline, at production rates less than one-half of safe yield, and at lowest production rates in 30 years. 23 Why are Water Levels in Decline? Drought Reduction of recharge from east due to overdraft on Mesa Not because of overpumping in NCMA 24 Threats Continued overdraft on Mesa (currently 7,000 to 8,000 AFY) Sea water intrusion Potential increased groundwater demand in NCMA Threat to Lopez Lake supply Threat to SWP deliveries 25 Questions? 26 Related Initiatives Recycled Water Regional Groundwater Sustainability Project Groundwater Modeling Sustainable Groundwater Management Act (SGMA) Zone 3 Low Reservoir Response Plan Habitat Conservation Plan Alternative Supplies 27 Recycled Water Regional Groundwater Sustainability Project Collaborative regional recycled water project One community. One water. One future. 28 Advanced Water Purification Process Upgrades 29 SSLOCSD WWTP Option ATP 30 Phased Groundwater model 31 Lopez Reservoir LRRP Overview Enacted when reservoir drops below 20,000 AF of storage and BOS declared emergency for Zone 3 Extend available supplies in Lopez Reservoir for 3 to 4 years under continuing drought conditions Achieved through reductions in downstream releases and municipal diversions BOS approved staying in LRRP through March 31st 2018 32 Historic Lopez Lake Storage 33 Related Water Supply Initiatives Arroyo Grande Creek Habitat Conservation Plan (HCP) Lopez System Modeling Prop 1 Stormwater Resources Plan Arroyo Grande Creek Pismo Creek Supplemental SWP Water Diablo Desal 34 Participant Discussion 35 Next Steps 36 Pocket Slides 37 Offsite ATF Option ATP 38 Municipal Diversions Initial Prescribed Actions-Municipal & Downstream Release Reductions Downstream Releases 39 Pismo Beach & SSLOCSD Recycled Water Facilities Planning Studies Identified preferred recycled water alternative 40 Current Lopez Projections 41