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San Joaquin County Community Environmental Setting,Impacts,and Mitigation Measures <br /> Development Department Surface Hydrology,Stormwater,and Water Quality <br /> quality policies in the San Joaquin County General Plan. Therefore,this impact <br /> is considered less than significant. <br /> Impact WQ-3: Surface Water Quality Degradation from <br /> Dewatering (No Impact) <br /> Dry Pit <br /> The mining operation is expected to excavate to depths that are below the local _ <br /> groundwater table(approximately 75 feet AMSL). Groundwater would not be <br /> blocked and would flow into the excavation pits. The groundwater would be <br /> removed by dewatering for Dry Pit Operations. <br /> Pumped groundwater would be used as process washwater and for truck washing, <br /> dust control,and materials production. Excess water would be pumped into the <br /> on-site settling ponds during mining operations. Thus,no discharge to surface <br /> waters is anticipated as a result of dewatering. Therefore,no impacts on <br /> surface water quality as a result of dewatering of groundwater are <br /> anticipated. <br /> Wet Pit <br /> Dewatering would not occur as part of the Wet Pit mining operations. Therefore, _ <br /> there would be no surface water quality degradation as a result of dewatering. <br /> There would be no impact and no mitigation is required. <br /> Impact WQ-4: Flooding Hazards (Less than Significant) <br /> Dry Pit <br /> The project area is not located within a 100-year floodplain. In addition,the <br /> proposed Project would not include the construction of houses or structures that <br /> would impede or redirect floodflows. Therefore,the project would be consistent <br /> with the flood hazard policies of the San Joaquin County General Plan. The <br /> project area is bordered on the west by a levee for the Delta-Mendota Canal and <br /> could flood if the levee failed. The Project's excavation pits are anticipated to — <br /> capture floodflows such that here would not be a significant risk of loss, injury, <br /> or death to people or structures as a result of the failure of a levee. This impact <br /> is considered less than significant.No mitigation is required. <br /> Wet Pit <br /> The potential flooding hazards during the Wet Pit operations would be similar to <br /> the potential hazards described for the Dry Pit operations . This impact is <br /> considered less than significant.No mitigation is required. <br /> DeSilva Gates Quarry Project —' <br /> Draft Environmental Impact Report 3.G-10 <br /> J85 0510105 <br />