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South Orange Coastal Ocean Desalination (SOCOD) Project Dana Point/Doheny Beach, California November 2010 Status Where Southern California Gets Its Water 50% Import - 50% Local Transfers & Storage Local Supplies LA Aqueduct (1913) State Water Project Entitlement (1972) Local Supplies Groundwater & Recycling Colorado River Aqueduct (1941) Conservation 2 MWDOC Member Agencies • • • • 14 cities 11 water districts 1 private water company 1 community service district • Orange County Water District • Total = 28 water • Population = 2.3 million Orange County Water Sources Source 2009-10 AF % Natural Flows Rivers/Streams 133,000 21 Indirect Recycled (Santa Ana River) 86,000 13 GWRS Purified Water 66,000 10 46% Local Draw on OCWD Groundwater Storage (23,000) -4 Recycled–Direct (landscape irrig.) 37,000 6 Imported for Replenishment 26,000 4 Imported for Direct Use 254,000 40 Consumptive Use 579,000 90 Water Use Efficiency Programs 65,000 10 Total without WUE 644,000 100% (added storage) Diemer Filtration Plant Regional Imported Water System to South Orange County • Water from the Joint Regional Water Supply System (JRWSS) • Water from the Water Importation Pipeline and South County Pipeline Major Water Supply Issues in California • Regulatory-imposed pumping restrictions have reduced State Water Project pumping by up to 50%; drought conditions have occurred; water allocations began July 1, 2009 • Long-term resolution of Bay-Delta fix is uncertain at this time, but many years away • Water recycling, development of other sources and water conservation are ALL NEEDED to close the supply gap • Ocean desalination is one new source that needs to be developed in California and along other coastal States of the U.S. South Orange Coastal Ocean Desalination Project Concept Project Layout South Orange Coastal Ocean Desalination Project • • 15 million gallons per day meets about 25% of the 2025 water demands for: 1. Laguna Beach 2. San Clemente 3. San Juan Capistrano 4. Moulton Niguel WD 5. South Coast WD All five agencies can physically receive the water into their systems 4 1 3 5 2 SOCOD Participants Total Water Sources (acre-feet per year) Current % 2035 % Wells 5,002 7% 9,736 12% Recycled Water 9,743 13% 13,420 16% 0 0% 15,000 18% Imported Water 60,621 80% 44,876 54% Total 75,366 100% 83,032 100% Ocean Water South Orange Coastal Ocean Desalination Project • NOT connected to a Coastal Power Plant • Utilizes slant well intake system to be protective of the ocean environment • Utilizes an EXISTING ocean outfall for brine discharge; makes discharge closer in salinity to that of the natural ocean water to improve mixing • Could be on-line in 2016 South Orange Coastal Ocean Desalination Project • Construction of a 15 million gallon per day Ocean Desalination Plant using a slant well subsurface intake to produce about 16,000 acre-feet per year of high quality drinking water is FEASIBLE • Project cost = $136 million (Boyle Engineering, 2007) to $152 million with an allowance for San Juan Basin mitigation • Cost of water = $1287 per acre foot (Boyle Engineering, 2007) to $1356 per acre foot with mitigation. • MWDOC has an executed contract from MET to provide $250 per AF towards the cost of the water Test Slant Well Schematic Ocean Surface 23o Main Aquifer 40 to 130 feet ± Infiltration Test Slant Well 325 feet Drilling Site at Doheny Beach Dual Rotary Drill Rig Welding Screen Joints Objectives for Three Year Extended Pumping and Pilot Studies • Start-up pumping of existing well in June 2010 to conduct study work • Extended pumping to pull in ocean water – 9 months • Validate groundwater model and beach wellfield capacity • Address upstream groundwater impacts • Assess water quality and microbial fouling • Confirm alluvial aquifer pretreatment capability • Evaluate water quality and post-treatment options • Conduct pilot plant study; develop process treatment specifications • Conduct materials corrosion tests • Refine Project cost estimates Unloading Test Facility Mobile Test Facility – Transformer and Panel Intuitech Technician Working on RO Unit Corrosion and Microbial Flow Test Apparatus Intuitech – Electrical Control Unit Slant Well Increase in Salinity Slant Well Conductivity and TDS* 16000 16000 15000 15000 14000 14000 13000 13000 12000 12000 11000 11000 10000 10000 9000 9000 8000 8000 E 7000 D 6000 4000 6000 C 5000 B A A, C :Conductivity Meter Calibrated B,D, E: Conductivity Meter Cleaned and Calibrated 3000 7000 2000 5000 4000 3000 2000 Date Conductivity TDS* * Note: TDS calculated by 0.65 x Conductivity TDS* (mg/l) Specific Conductance (uS/cm) (June through Oct 2010) Questions? Thank you!