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

Hydrologic Setting Confluence of Sacramento & San Joaquin Rivers Eastside tributaries Delta - water switching yard for State Delta supplies water to about 22 million in State The Sacramento-San Joaquin Delta covers more than 738,000 acres in five counties, and comprises many small islands within a network of canals and natural sloughs. The Sacramento and San Joaquin rivers come together in the Delta before they flow to the San Francisco Bay and out to the ocean. The Delta is the largest estuary on the west coast, and is home to over 750 plant and animal species, many of which are endangered. The Delta provides drinking water for two-thirds of all Californians, and irrigation water for over 7 million acres of highly productive farmland.Rivers in San Joaquin County Water Resource Division

Water Resource Issues Rapid urban growth, agricultural and environmental demands Complex water management Heavy reliance on groundwater Basin overdraft & saltwater intrusion New arsenic standards Napa Proposal - increased Delta exports (1 million acre feet) Population increased more than 20 % in past decade Some communities experienced 50% growth Population projected to double by 2035 Water Resource Division

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

Water Supply Projects Potential Projects Feasibility Phase Design/Pilot Phase Implementation Phase 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 Planning identified more than 14 different management options. Options were grouped into 3 tiers based on feasibility, and Water Resource Division

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

Location Map Water Resource Division

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

MORE WATER Project Map Water Resource Division

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

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

Project Development Schedule 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 Engineering Feasibility Studies Phase 4 Project-Specific EIR/EIS Phase 5 Engineering & Final Design Phase 6 Permitting & Construction Water Resource Division

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

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

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

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

Basin Management Area Water Resource Division

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

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

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

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

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

Questions? Water Resource Division

Water Resource Division