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T-4 . Potentially Significant Impact • Abandoned Natural Gas well Drilling [ Impact 4 . 12-4 ] Soil and water may be contaminated from heavy metals and oil-based compounds remaining from abandoned natural gas well drilling muds and could affect future users of the Project Site . Finding : Changes on alterations ;ave been required in, or incorporated into , the Project , which avoid or substantially lessen the significant environmental effect as identified in the FF-IR to a non-significant level . These mitigation measu�, s are listed below. Statement of Fact : The impact will be reduced by the following : • The area within a 200-foot radius of each of the five abandoned natural gas well --ads within the Project Site must be investigated by a qualified professional to determine if the drilling muds are present and, if so , whether concentrations of heavy metals and c _ 1-based compounds are present at concentrations -.°:at may affect public and environmental health. If the muds contain concentrations of chemicals above regulatory action levels , the drilling muds and any adjacent affected soil must be removed and/or remediated in accordance with regulatory requirements . The investigation must occur prior to tentative approval of any development permits . Removal and/or remediation of contaminated soils must occur prior to Project construction in the vicinity of the well heads . • See FEIR, Section 4 . 12 . T-5 . Potentially Significant Impact • PCB Exposure [Impact 4 . 12-51 Potential health impacts may result from public exposure to PCBs associated with transformers or electromagnetic fields associated with overhead electrical lines . Finding : Changes on alterations have been required in, or incorporated into, the Project , which avoid or substantially lessen the significant environmental effect as identified in the FEIR to a non-significant level . These mitigation measures are listed below. C2-55 0189r/0202r