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Chapter 6 <br />Water Supply Characterization <br />GRDUNDWATER BASIN <br />'Be" No ; 071 <br />J ' <br />I <br />LIVERMORE <br />GROUNDWATI <br />\ <br />LJ <br />.1 <br />SUNOL VALLEY <br />\ <br />GROUNDWATER BAS:N <br />•�• <br />(Basin No. 2-11) <br />J <br />' fwl�h - �w Ju1RrW n..r <br />� UIIW. <br />,,.kl-d Ma;o .n.niR <br />FTSE 1 AREA <br />IncacoR =� <br />�,. ,r F�r �.F Il.fwrd F -Y ••.I..r� . <br />h...'t <br />—1.-d-4117 <br />.r..R. <br />N.�ftN..n 6.y W, <br />THE CITY OF <br />PL£ASANTON, <br />SAN JOAQUIN <br />GROUNDWATER BASIN- <br />]TRACY SJBBASIN <br />(Subbasin No. 5-22.15) <br />I <br />Legend <br />zone 7 Service Area <br />GROUNDWATER BASIN <br />Livermore Valley Groundwater Basin <br />San Joaquin Valley Groundwater Basin <br />Sunol Valley Groundwater Basin <br />San Ramon Valley Groundwater Basin <br />Main Basin Management Area <br />Fringe Management Area <br />Uplaed Management Area <br />Figure 6-2. Livermore Valley Groundwater Basin and Subbasins <br />6.2.2.2 Groundwater Management <br />Zone 7's GMP documented all of Zone 7's then -current groundwater management policies and programs <br />and was developed to satisfy the requirements set forth in the California Groundwater Management <br />Planning Act (Water Code Sections 10750, et seq.). More recently, a Salt and Nutrient Management Plan <br />has been incorporated into the GMP. Zone 7 prepares annual reports that summarize the results of the <br />groundwater monitoring, evaluation, and management efforts by water year; the most recent version of <br />the annual report is for the 2019 water year (October 1, 2018 through September 30, 2019). In addition <br />to the annual reports completed over the years, Zone 7 completed the Alternative Groundwater <br />Sustainability Plan for the Livermore Valley Groundwater Basin (Alternative GSP) in 2016 as required <br />under SGMA. <br />For Zone 7's operations, the Main Basin is considered a storage facility and not a long-term water supply, <br />because Zone 7 does not have access to naturally recharged water ("sustainable yield"). Zone 7 only pumps <br />groundwater that has been artificially recharged with surface water supplies. As part of this conjunctive use <br />program, Zone 7's policy is to maintain groundwater levels above historic lows in the Main Basin to minimize <br />the risk of inducing land subsidence. Currently, this is accomplished by releasing SWP water to the arroyos <br />for percolation and replenishment of the aquifers and by managing pumping activities. <br />WEST YOST 6-9 City of Pleasanton <br />2020 Urban Water Management Plan <br />May 2021 <br />