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ENVIRONMENTAL HEALTH DEPARTMENT <br /> pU1N <br /> SAN JOAQUIN COUNTY Unit Supervisors <br /> Donna K.Heran,R.E.H.S. Cl Bor man,R.E.H.S. <br /> 304 East Weber Avenue, Third Floor Carl g <br /> w. Director Mike Huggins,R.E.H.S.,R.D.I. <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 <br /> Douglas W.Wilson,R.E.H.S. <br /> • Cq, a;p • Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> <<FOR Laurie A.Cotulla,R.E.H.S. Robert McClellon,R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 <br /> Mark Barcellos,R.E.H.S. <br /> RICH MCCURDY JUN 112003 <br /> SR CONSULTING ENGINEER <br /> PACIFIC GAS & ELECTRIC COMPANY <br /> 375 NORTH WIGET LANE <br /> WALNUT CREEK CA 94598-2412 <br /> RE: McDonald Island Gas Storage Facility, San Joaquin County, California <br /> San Joaquin County Environmental Health Department (EHD) reviewed your letter <br /> dated May 15, 2003, and the "Soil and Groundwater Assessment Report" dated <br /> September 16, 2002, prepared by Alisto Engineering Group regarding the above <br /> referenced site. As you have recognized the Central Valley Regional Water Quality <br /> Control Board is the agency that has authority to provide oversight and closure for your <br /> site. You have requested EHD concur with the conclusions and recommendations in <br /> the September 2002 report. Instead, we provide the following comments. <br /> The soil contamination is not defined laterally or vertically. The deepest soil sample <br /> analyzed was from 9 feet below surface grade (SB4) and had the highest concentration <br /> of Total Petroleum Hydrocarbons as motor oil. There were low levels of contaminants <br /> found in the grab groundwater samples, so the conclusion that groundwater does not <br /> appear to have been impacted is not supported by the data in the report. <br /> If you have any questions contact me at (209) 468-3449. <br /> Donna Heran,REHS, Director <br /> Environmental Health Department <br /> Margaret Lagorio, Supervising REHS <br /> Unit IV <br /> c: CVRWQCB —Wendy Cohen <br />