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Chapter 6 <br />Water Supply Characterization <br />D <br />Ab <br />_ sfes <br />Reerrrdr l <br />�{! c (1.5 MAF7 {I'� <br />THE CITY OF <br />PLE ASANTON. <br />. T.�YWp.YYe <br />we roi <br />1,800 cls <br />r <br />7 000 ch <br />10.00 <br />0 d, <br />90s <br />000 cls <br />Figure 6-8. Sites Reservoir Project: Location and Facilities <br />Sites Reservoir could provide both water supply and storage for Zone 7. In December 2016, the Zone 7 <br />Board authorized participation in Phase 1 at a cost of $850,000. In December 2019, the Zone 7 Board <br />authorized participation in Phase 2 (2019 Sites Reservoir Project Agreement) at a cost of $600,000. The <br />Zone 7 Board then approved continued participation in Phase 2 through December 2021 at an amount <br />not -to -exceed $1,000,000 in July 2020. Key work under these two phases include planning, design, <br />financial analysis, and environmental review and permitting. <br />In the 2019 WSE Update, Zone 7 considered 5,000 to 10,000 AFY of average yield from Sites Reservoir, in <br />combination with other water supply options. The availability of this supply was varied based on <br />hydrology, with more water delivered to Zone 7 during dry years. At Zone 7's request, water would be <br />released from Sites Reservoir annually to the Sacramento River, then conveyed by the SWP system <br />through the Delta and to the SBA. Based on model results, Sites Reservoir's key benefit is the availability <br />of water during dry years when the shortage risk is greatest. Sites Reservoir is a good complement to the <br />DCP, which could potentially increase SWP yield during wet years. Because Sites Reservoir provides both <br />storage and new supply, it adds flexibility to Zone 7's water supply system; for example, the timing of <br />deliveries from Sites Reservoir could be modified to maximize yields from other water supplies and/or to <br />accommodate delivery timing restrictions of other supplies. For Zone 7, water could be released from <br />Sites Reservoir annually to the Sacramento River, generally during dry and critical years, then conveyed <br />by the SWP system through the Delta and to the SBA. <br />Recently, the Zone 7 Board re -affirmed continued participation in Sites Reservoir at a 10,000 AFY share. <br />Zone 7's 2020 UWMP therefore assumes an average water supply of 10,000 AFY to Zone 7 from <br />Sites Reservoir. <br />WEST YOST 6-31 City of Pleasanton <br />2020 Urban Water Management Plan <br />May 2021 <br />