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fuels and lubrication products could contaminate shallow soils and eventually migrate to the groundwater. This impact would be significant if the activities associated with the project would significantly degrade groundwater quality. See Draft EIR,pp. 4.8-24 to 4.8-25. Mitigation Measures Mitigation Measure 4.8.2: Implement Mitigation Measure 4.11.2 (leak containment and precautions). (Draft EIR,p. 4.8-25.) Findings: Based on the whole record, this Commission finds that with implementation of Mitigation Measure 4.8.2, impacts from accidental spill, leaks, or improper disposal ofpetroleum fuel are reduced to a less than significant level. (Draft EIR,p. 4.8-25.) Impact 4.8.3 Excavation that disturbs and/or truncates the existing groundwater well shafts on the project site could increase the potential for contaminants to enter and pollute the groundwater through the wells. (Draft EIR, p. 4.8-25.) Significance Before Mitigation: Potentially Significant. Facts: There are five known wells located within the project boundaries, three agricultural wells and two domestic wells. The proposed project would continue to use the two of the agricultural wells and one of the domestic wells. The two unused wells, as well as others that may not yet be identified, would not be operated as part of the project and therefore, could be either truncated or destroyed during quarry operations. As part of the project, the project applicant would decommission unused wells. See Draft EIR,pp. 4.8-25 to 4.8-26. Mitigation Measures Mitigation Measure 4.8.3: Prior to the commencement of excavations, the project applicant shall conduct a comprehensive well survey to locate, identify, and confirm all existing groundwater wells on the project site. Information for well locations shall be obtained, if available, from DWR, San Joaquin County Environmental Health Department, Stanislaus County, and the former property owners. Groundwater wells that will not remain in operation shall be properly destroyed and removed in accordance with the DWR Well Standards, depending on location, under permit and inspection from either the Stanislaus County Department of Environmental Health or San Joaquin County as per the San Joaquin County Development Title, Section 9-1115.5(e). The well destruction shall be designed to create a sanitary seal that would not conduct vertical water flow in the event that the well is truncated or damaged during mining operations. (Draft EIR, pp. 4.8-25 to 4.8-26.) Findings: Based on the whole record, this Commission finds that with implementation of Mitigation Measures 4.8.3, impacts from the disturbance or truncation of existing groundwater well shafts 20