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San Joaquin County Community Environmental Setting,Impacts,and Mitigation Measures <br /> Development Department Groundwater and Groundwater Quality <br /> ■ Limit the depth of excavation, as determined by San Joaquin County, — <br /> until corrective measures are approved by San Joaquin County and <br /> implemented by the Operator. <br /> ■ Lower a well pump for any well where groundwater levels are <br /> reduced by the mining activities. <br /> ■ Deepen any well where lowering of a well pump is infeasible to <br /> maintain well capacity. <br /> ■ Replace any well for which all preceding measures fail to mitigate <br /> loss in well capacity. <br /> ■ Provide an altemative water supply to any property where the <br /> preceding measures fail to mitigate loss in well capacity or water — <br /> supply caused by the mining activities. <br /> ■ Perform any combination of the preceding actions, or other <br /> measures,necessary to restore loss in a water supply attributed to the <br /> mining activities. <br /> These measures would be subject to the review and approval of the <br /> County before implementation,which would ensure consistency with the <br /> San Joaquin County General Plan. In any case,as a performance <br /> standard,these measures would bring groundwater levels back into the <br /> range of historical fluctuations, or functionally replace any wells the <br /> capacity of which had been impaired by the mining Project. If the <br /> adopted mitigation was shown to be ineffective in reducing impacts to a _ <br /> less-than-significant level, San Joaquin County would retain authority to <br /> require supplemental or additional mitigation measures to mitigate the <br /> impact. <br /> Impact GW-4: Reductions in Groundwater Levels Caused <br /> by Consumptive Use (Less than Significant) <br /> Dry Pit <br /> Direct water demand for the proposed Project is projected to be approximately <br /> 425 ac-ft/yr(380,000 gallons/day). The proposed Project would use water in two <br /> primary ways _ <br /> ■ Process washwater would be used to wash sand and gravel over screens and <br /> other equipment,for dust control in the aggregate processing plant,and be <br /> retained as moisture in the processed material. <br /> ■ Water would be applied with a water truck to control dust in the plant area <br /> and on unpaved haul roads. <br /> Also, some water would be consumed indirectly through evaporative loss at the <br /> pits receiving the dewatering flows and through evapotranspiration from <br /> undisturbed or reclaimed almond crops. To determine the level of impact that <br /> might result from these consumptive uses,the amount of water that would be <br /> DeSilva Gates Quarry Project — <br /> Draft Environmental Impact Report 3.1-1-10 <br /> AS 05105 05 <br />