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USBR/MWD SALINITY MANAGEMENT STUDY FINAL REPORT w en ~..... I-' METROPOLITAN DISTRIBUTION SYSTEM MANAGEMENT ANALYSIS OF BLENDING OPTIONS From 1995 to 1997, Metropolitans practice was to provide a blend of25 percent SWP water during April through September to mitigate the high salinity of its Colorado River water. This, blend operation helped support local resource management and reduced consumer impacts. Technical Appendix 4 provides more detailed information on Metropolitan's importation and distribution system as it relates to salinity management. Technical Appendix II specifically addresses the technical details of blending operations in Metropolitan's system. Blending occurs using only two sources of imported water: I. SWP water from the East Branch near San Bernardino, and 2. CRA water The blend may be achieved at three filtration plant locations that collectively provide about , 80 percent of Metropolitans delivered water: . Weymouth Plant . Diemer Plant . Skinner Plant and adjacent untreated lines The remaining 20 percent of delivered water is unblended SWP water, as the distribution system cannot deliver Colorado River supplies directly to some areas (see Figure 3-3). The Jensen and Mills Plants receive only SWP supplies. The West Branch of the SWP, which supplies the Jensen Filtration Plant, does not affect the blend at the Weymouth, Diemer, or Skinner Plants. In addition to supplying water to the blend area, the East Branch of the SWP also provides unblended SWP water to the Mills Filtration Plant and the Rialto Feeder. Figure 3-3 identifies the area that receives blended water. BOOKMAN-EDMONSTON ENGINEERING, INC. 3-6 0:\LOCALRESIANDYSISALlNITY\JUNE98-2\7SECT3.DOC 0712019810:59 AM Section 3 Evaluation of Potential Regional Salinity Management Strategies . . .