FINAL REPORT Evaluation of Seawater Desalination Projects ...

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EVALUATION OF SEAWATER DESALINATION PROJECTS PROPOSED FOR THE MONTEREY PENINSULA • California American Water Monterey County Coastal Water Project Marine Biological Resources Phase II Report • Noise Data for the Coastal Water Project • California American Water Monterey County Coastal Water Project Terrestrial Biological Resources Phase II Report • Cultural Resources Assessment Technical Report • Preliminary Geotechnical Evaluation Monterey County Coastal Water Project • Preliminary Hazardous Materials Assessment Technical Memoranda included in the PEA are as follows: • ASR Wellfield Conceptual Design, Modeling Analysis, and Preliminary Environmental Assessment • Aquifer Storage and Recovery (ASR) / Segunda Conveyance System • Brine Disposal • MLPP Cooling Water Supply • Desalination Plant at the Duke Energy East Site • Desalinated Water Conveyance System (DWCS) • Feasibility of Using HDD Wells for Water Supply • HDD Well Supply • North Marina Site Alternative Desalination Plant • Site Comparison • System Flow Management and Hydraulics • Terminal Reservoir Supports Local Area and Regional Objectives The CWP supports local area objectives by resolving the water supply deficit associated with SWRCB Order No. 95-10 and by providing 1,000 ac-ft per year to reduce overdraft of the Seaside Groundwater Basin. The regional project alternative also supports regional objectives by providing potential expansion to the regional water supply system. Omissions or Fatal Flaws See Table 11, Regulatory Requirements, in Section 7 of this report in regard to the potential need for additional information. Monterey Peninsula Water Management District 3-8
EVALUATION OF SEAWATER DESALINATION PROJECTS PROPOSED FOR THE MONTEREY PENINSULA 3.2 Monterey Bay Regional Seawater Desalination Project (MBRSDP) Project Purpose The MBRSDP is proposed by Pajaro/Sunny Mesa Community Services District (P/SMCSD) to enable the Monterey Peninsula area to comply with SWRCB Order No. 95-10, to offset overdraft of the Seaside Groundwater Basin, and to provide supplemental water supplies to serve portions of Northern Monterey County. Customers Identified The MBRSDP will serve the Monterey Peninsula, the service area of the P/SMCSD, and other areas of Northern Monterey County and portions of the Pajaro Valley Water Management Agency 13 service area. A regional desalination plant capable of meeting the regional requirements is envisioned. The plant would be constructed in phases as additional users are brought into the system. However, although at present the identified project water demands include 10,730 ac-ft per year to comply with SWRCB order No. 95-10 and 3,000 ac-ft per year to reduce overdraft of the Seaside Groundwater Basin, no additional supply is proposed to meet future demands in the Monterey Peninsula area. Technology Appropriate/Demonstrated on this or Similar Supply The technical description for the MBRSDP is included in the Conceptual Design Report 13 (CDR) and the project’s Proposition 50 Pilot Project Grant Application to California Department of Water Resources. 14 Both documents were prepared by Poseidon Resources for P/SMCSD. The proposed treatment process is based on the use of RO to accomplish the water quality objectives of the project. The proposed feed water source has been documented to experience high turbidity, and extensive pretreatment systems have been included to provide suitable feed water to the RO process. Pretreatment Currently, clarification followed by filtration is anticipated to be the major pretreatment steps. The project will rely on pilot testing to identify the optimum pretreatment approach. 13 Pajaro/Sunny Mesa Community Services District in Cooperation with Poseidon Resources Corporation, Monterey Bay Regional Desalination Project, Conceptual Design Report, April 2006. 14 Pajaro/Sunny Mesa Community Services District, Monterey Bay Regional Desalination Project, Proposition 50 P/SMCSD Pilot Demonstration Project Grant Application, March 22, 2006. Monterey Peninsula Water Management District 3-9
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