FINAL REPORT Evaluation of Seawater Desalination Projects ...

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EVALUATION OF SEAWATER DESALINATION PROJECTS PROPOSED FOR THE MONTEREY PENINSULA Figure 5 – Seawater Desalination Vessel Project Location Map Sources: Water Standard Company, PBS&J Monterey Peninsula Water Management District 2-10
EVALUATION OF SEAWATER DESALINATION PROJECTS PROPOSED FOR THE MONTEREY PENINSULA 3 Project Function This section provides the following information for each project: • Project purpose • Customers identified • Technology appropriate/demonstrated on this or similar supply • Waste stream fate identified • Availability of historic feedwater quality data and sanitary survey • Quality of supporting documentation • Supports regional MPWMD objectives • Omissions or fatal flaws A primary purpose of all four projects is to resolve the issues associated with SWRCB Order No. 95-10 and the overdraft of the Seaside Groundwater Basin. The Regional CWP and the MBRSDP would provide additional water supplies to meet regional water demand as well as resolve SWRCB Order No. 95-10 and Seaside Groundwater Basin overdraft issues. Each of the projects has primarily identified customers within CAW’s service area due to the requirements of SWRCB Order No. 95-10. In addition, the Regional CWP and the MBRSDP have identified water demands of potential customers on the Monterey Peninsula and in areas to the north. The only existing commitments by the MBRSDP are customers in the P/SMCSD service area. The proposed technology for each of the projects varies as described in detail below. A major difference is the proposal to use wells for feed water at the SCDP compared to ocean intakes for the CWP and the MBRSDP. The ship-based intake and outfall of the SDV project is unique. A great deal of information on the appropriate seawater desalination technology will be obtained during the pilot plant testing scheduled for the CWP and the MBRSDP. Brine discharge for the CWP would be via the MLPP outfall. For the MBRSDP, the primary option for brine discharge is the National Refractories outfall with the MLPP outfall as an alternative. Brine discharge for the SCDP would be via radial wells or horizontal directionally drilled wells along the coastline north of Sand City in former Fort Ord, or via the Monterey Regional Water Pollution Control Agency (MRWPCA) outfall as an alternative. Technically, all of these discharge options may be possible. However, additional studies are needed to determine the adequacy of the condition of the National Refractories outfall and the fate of the brine plume as it enters the receiving waters. Additional analyses Monterey Peninsula Water Management District 3-1
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