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San Joaquin County Community Environmental Setting, Impacts,and Mitigation Measures <br /> Development Department Groundwater and Groundwater Quality <br /> Implementation of Stage IV-B instead of Stage IV-A would involve the <br /> reclamation of the entire North Pit 3 acreage(35 acres)and would not include an <br /> agricultural pond. Therefore,the consumptive use for this stage would represent <br /> only evapotranspiration from agricultural crops grown on the undisturbed and <br /> reclaimed lands (208 acres). Estimated consumptive use for Stage IV-B would <br /> _ be approximately 352 ac-ftlyr,which is less than the premining consumptive use <br /> of 370 ac-ft/yr because the 10 acres used for the mine's processing plant would <br /> not be replanted with agricultural crops. <br /> �r Wet Pit Conclusions. Stages I through IV-B of the proposed Project's wet pit <br /> operations are anticipated to result in a net increase in water consumption <br /> compared to baseline conditions (Table 3.11-2). Water use under the proposed <br /> ! Project would represent a shift from the use of surface water for baseline <br /> agricultural operations to total dependence on groundwater. The water use <br /> increment between the premining conditions and Stages I through IV-B may be <br /> .. greater than described because the actual premining consumptive use estimate <br /> may be lower than the estimated premining use,which does not consider the <br /> quantity of irrigation water that may seep into the ground and recharge the <br /> ;,. aquifer. <br /> Dry and Wet Pit Conclusions. The Project is located in the Tracy subbasin,' <br /> ` which is a groundwater basin that is not in overdraft(Amezquita pers. comm.) <br /> and has had relatively stable water levels in most wells over the past 10 years <br /> (DWR 2004). Although the dry pit and wet pit operations would result in a <br /> consumptive use of groundwater greater than the premining condition, the <br /> proposed Project's maximum consumptive use of approximately 1,400 ac-ft/yr <br /> would represent approximately 0.01%of the total aquifer volume of 1,300,000 <br /> ac-ft. Therefore,the Project's potential impact on local wells is considered <br /> less than significant. <br /> DeSilva Gates Quarry Project <br /> Draft Environmental Impact Report 3.1-1-13 <br /> AS 05105.0.5 <br />