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d. Be located on a site which is included on a list of hazardous materials sites compiled pursuant to Government Code Section 65962.5 and, as a result, would it create a significant hazard to public or the environment. No Impact. Although the Site is identified as a hazardous materials site(State I.D. #39000003)on the Department of Toxic Substances Control "Site Cleanup—Site Mitigation and Brownfields Reuse Program Database,"the implementation of the proposed project would not create a significant hazard to the public or environment. Significant impacts would not be created by this project. Mitigation measures are not necessary to prevent hazards to the public. e. Impair implementation of, or physically interfere with, an adopted emergency response plan or emergency evacuation plan. No Impact. The proposed project would not cause any interference with emergency response plans or emergency evacuation plans (OCLIW 2003). Significant impacts would not result from the proposed project. Mitigation measures are not necessary. Findings of Significance: ❑ Potentially Significant Impact ❑ Potentially Significant Unless Mitigated X Less Than Significant Impact ❑ No Impact 8. Hydrology and Water Quality Project activities likely to create an impact: a Removal of top 18 to 24 inches of burned material, ash and visibly affected soil within gravel pit area ® Removal of localized areas of deeper soil containing elevated concentrations of metals or pyrolytic oil Description of Environmental Setting: Two water-bearing zones are within the Tulare Formation beneath the project site. The upper water-bearing zone lies above the Corcoran Clay and the confined lower water bearing zone lies beneath the Corcoran Clay aquitard. The upper water-bearing zone groundwater table elevation is encountered at approximately 65 feet ms]. Groundwater monitoring wells installed at the Site intersect the upper water-bearing zone approximately 100 feet below the natural grade (165 feet msl) surrounding the gravel pit. The groundwater table is located approximately 35 feet below the bottom depth of the gravel pit. The water table aquifer extends to 200 feet bgs and is bound by the top of the Corcoran Clay, which prevents the vertical migration of groundwater from the upper water-bearing zone to the deeper water-bearing zone. Recharge of the upper water-bearing zone is primarily from irrigation and seepage of surface water through the alluvium with little contribution from rainwater. Based on topography, regional groundwater is suspected to flow to the northeast toward the San Joaquin Delta. Local groundwater flow was calculated from onsite monitoring well data to be toward the northwest at a shallow gradient of 0.001. Aggregate mining 32