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Chapter 6 <br />Water Supply Characterization <br />THE CITY OF <br />PL£ASANTON, <br />Orinda <br />WTP <br />I <br />I <br />Y Reurvrt <br />Oaklandlive to <br />♦ ♦ ♦ WTP u- ♦ ♦ D Zone I <br />♦ R <br />San .:..� <br />Francisco ♦ ♦ • • _ . <br />• soutnern • <br />• � Loop • • • • . <br />Delivery to <br />SFPUC'SC", <br />San Francisco <br />Bay <br />N <br />Figure 6-6. Bay Area Regional Desalination Project: Diversion and Conveyance Facilities <br />6.2.8.2 Delta Conveyance Project <br />Accounting for imported and local surface water, the retailers' GPQs, and recycled water, the Tri -Valley <br />area receives approximately 70 percent of its incoming water supplies through the Delta as delivered by <br />DWR. For Zone 7, the Delta conveys about 90 percent of its existing incoming supplies under normal <br />conditions. SWP water, carryover water, water banked in Kern County and transfer water all come through <br />the Delta. <br />This key conveyance component of the SWP is increasingly threatened by ecosystem considerations, <br />seismic risk, and climate change/sea level rise, reducing the reliability ofthe SWP system. DWR's proposed <br />Delta Conveyance Project DCP) would install a new tunnel to convey freshwater from north of the Delta <br />to a point south of the Delta. The DCP will likely increase SWP reliability and improve water quality, but <br />an alternate conveyance system for the majority of Zone 7's water is the significant benefit as follows: <br />A major Northern California earthquake could take out levees in the Delta. Experts suggest <br />that fresh water supply through the Delta could be lost for months, if not a year or two. The <br />DCP would provide an alternative conveyance of freshwater from north of the Delta (near <br />Sacramento) to a point south of the Delta (near Byron) while levee repairs and other work <br />are being completed. <br />WEST YOST <br />6-26 <br />City of Pleasanton <br />2020 Urban Water Management Plan <br />May 2021 <br />