1. Water Resource Division San Joaquin County Water Resource Management Planning Update C. Mel Lytle, Ph.D. Water Resource Coordinator San Joaquin County Department of Public Works August 26, 2004

2. Water Resource Division Hydrologic Setting Confluence of Sacramento & San Joaquin Rivers Confluence of Sacramento & San Joaquin Rivers Eastside tributaries Eastside tributaries Delta - water switching yard for State Delta - water switching yard for State Delta supplies water to about 22 million in State Delta supplies water to about 22 million in State

3. Water Resource Division Water Resource Issues Rapid urban growth, agricultural and environmental demands Rapid urban growth, agricultural and environmental demands Complex water management Complex water management Heavy reliance on groundwater Heavy reliance on groundwater Basin overdraft & saltwater intrusion Basin overdraft & saltwater intrusion New arsenic standards New arsenic standards Napa Proposal - increased Delta exports (1 million acre feet) Napa Proposal - increased Delta exports (1 million acre feet)

4. Water Resource Division Water Management Planning Two-year consensus-based effort including 29 local, State and Federal stakeholder agencies Two-year consensus-based effort including 29 local, State and Federal stakeholder agencies Water supply demand (200,000 acre feet overdraft) Water supply demand (200,000 acre feet overdraft) Developed management goals Developed management goals Outlined new water supply projects Outlined new water supply projects Adopted by Board in 2002 Adopted by Board in 2002

5. Water Resource Division Water Supply Projects Tier I New Melones Rights………………….. New Hogan Reoperation Farmington SSJID/OID Transfer South County Water Supply Stockton Delta Diversion Urban Conservation Tier II NSJWCD GW Recharge Agricultural Conservation Freeport Wastewater Reclamation Mokelumne River Tier III South Gulch American River ……..BOR IRMP Stockton Delta Diversion SJC-Freeport Diversion MORE WATER Project SEWD Farmington Program NSJ - GW Recharge SSJID/OID Transfers South County Water Supply Urban Conservation Potential Projects Feasibility Phase Design/Pilot Phase Implementation Phase

6. Water Resource Division County Project Summary MORE WATER Project MORE WATER Project New Mokelumne River supply New Mokelumne River supply Freeport Interconnect Project Freeport Interconnect Project New American River supply New American River supply Groundwater Basin Planning Groundwater Basin Planning Eastern Basin Management Plan Eastern Basin Management Plan USGS Joint Salinity Project USGS Joint Salinity Project

7. Water Resource Division Location Map

8. Water Resource Division MORE WATER Project “wet year storage for dry year use” Mokelumne River Water & Power Authority -1990 Mokelumne River Water & Power Authority -1990 New supply & hydropower from Mokelumne River New supply & hydropower from Mokelumne River Cost share – County, Stockton & Lodi Cost share – County, Stockton & Lodi Phase I Feasibility Assessment – Completed 2003 Phase I Feasibility Assessment – Completed 2003 Mokelumne River Watershed

9. Water Resource Division MORE WATER Project Map

10. Water Resource Division Pardee Reservoir Diversion 650 million gallons per day 12 mile tunnel/pipeline Pardee Reservoir Wet year supply 40 to 90 kaf

11. Water Resource Division Duck Creek Dam & Reservoir 150,000 acre foot capacity 10 megawatt power capacity Duck Creek Site

12. Water Resource Division Project Development Schedule Phase 1 Reconnaissance Study - Released June 2004 Phase 1 Reconnaissance Study - Released June 2004 Phase 2 Integrated Conjunctive Use Programmatic EIR Coordinate with Local, State & Federal Agencies Refine Water/Groundwater Management Plans Prepare Program EIR on Management Plan Conjunctive Use Alternatives Phase 3 Phase 3 Engineering Feasibility Studies Phase 4 Project-Specific EIR/EIS Phase 5 Phase 5 Engineering & Final Design Phase 6 Permitting & Construction

13. Water Resource Division Freeport Diversion Project EBMUD Freeport Regional Water Project – dry year supply by 2008 EBMUD Freeport Regional Water Project – dry year supply by 2008 Pipeline available in normal & wet years. Pipeline available in normal & wet years. 44,000 to 62,000 acre feet 44,000 to 62,000 acre feet 100 mgd 185 mgd 85 mgd 1976-77 Drought

14. Water Resource Division Negotiate with EBMUD for use of pipeline Negotiate with EBMUD for use of pipeline Complete project feasibility & environmental analysis Complete project feasibility & environmental analysis Secure water right & construct project Secure water right & construct project Freeport Diversion Next Steps Freeport Duck Creek Reservoir MORE WATER

15. Water Resource Division Groundwater Overdraft County’s Eastern Basin County’s Eastern Basin Groundwater level 60 feet below MSL Groundwater level 60 feet below MSL Strong west to east gradient in Stockton area Strong west to east gradient in Stockton area Saline Intrusion Saline Intrusion

16. Water Resource Division Groundwater Management Planning Eastern San Joaquin Basin Plan - Groundwater Banking Authority Eastern San Joaquin Basin Plan - Groundwater Banking Authority 1 year consensus-based collaborative effort including 45 agencies 1 year consensus-based collaborative effort including 45 agencies For State funding eligibility For State funding eligibility “Management Objectives” “Management Objectives” Monitoring programs Monitoring programs Water supply and recharge projects Water supply and recharge projects

17. Water Resource Division Basin Management Area

18. Water Resource Division Plan Purpose & Objectives Enhance Long-Term Sustainability of the Eastern San Joaquin Basin Enhance Long-Term Sustainability of the Eastern San Joaquin Basin Prevent Further Saline Intrusion Prevent Further Saline Intrusion Develop Program to Monitor, Evaluate and Predict Basin Conditions Develop Program to Monitor, Evaluate and Predict Basin Conditions Maintain Local Control Maintain Local Control Financing & Partners Financing & Partners Project Coordination Project Coordination

19. Water Resource Division USGS Joint Salinity Project Groundwater Banking Authority, US Geological Survey & State Dept. of Water Resources Groundwater Banking Authority, US Geological Survey & State Dept. of Water Resources $2.5 million over 5 years - $1.25 million from State and Feds $2.5 million over 5 years - $1.25 million from State and Feds Source saline groundwater Source saline groundwater Groundwater recharge and flow Groundwater recharge and flow Monitoring well network/database Monitoring well network/database Reduce saline intrusion Reduce saline intrusion

20. Water Resource Division Management Plan Next Steps Plan Adoption – 2004 Plan Adoption – 2004 Continued local and regional cooperation Continued local and regional cooperation Increased data collection and analysis Increased data collection and analysis State and Federal funding State and Federal funding Implementation of management objectives Implementation of management objectives Recharge project coordination Recharge project coordination

21. Water Resource Division Integrated Conjunctive Use Program East Basin Conjunctive Use Program MORE WATER SJC-FREEPORT OTHER SUPPLY PROJECTS SEWD FARMINGTON PROGRAM GILL CREEK BASINS STOCKTON ASR WELLS NSJWCD RECHARGE OTHER PROJECTS CSJWCD IN-LIEU LODI ASR WELLS DELTA DIVERSION CALAVERAS River STANISLAUS River EWA PROJECTS

22. Water Resource Division Groundwater Recharge Projects In-lieu groundwater recharge In-lieu groundwater recharge Well facilities Well facilities Direct recharge Direct recharge Local and regional support Local and regional support

23. Water Resource Division Conjunctive Use Implementation 1.5 million acre feet - aquifer storage

24. Water Resource Division Questions?