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STATL OF CALIFORNIA — ENVIRONMENTAL PROTECTION AGENCY PETE WILSON. Gove—.• <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> CENTRAL VALLEY REGIONr <br /> 3443 ROUTIER ROAD. SUITE A <br /> SACRAMENTO, CA 95827-3098 F <br /> PHONE: 69 25 255-3000 �l <br /> FAX (9 6i 255-3015 <br /> Em C* <br /> 0CT261992 <br /> ENV[RONMENTAL HEALTH <br /> EF��iI 7b�trt�Ib�.a <br /> 22 October 1992 <br /> Mr. Richard C. Laubacher <br /> BP Oil Company <br /> 4850 East 49th Street <br /> Cleveland, Ohio 44125-1079 <br /> REQUEST FOR A WORK PLAN TO DEFINE LATERAL AND VERTICAL EXTENT OF PETROLEUM <br /> HYDROCARBON CONTAMINATION AT BP OIL COMPANY, STOCKTON FACILITY, SAN JOAQUIN <br /> COUNTY j,'vS AIA-vq bQ— <br /> Thank you for submitting the first quarterly ground water monitoring report <br /> for your facility in Stockton. The report is well written, organized, and <br /> fully documented. <br /> We concur with your statement that the recent sample results are consistent <br /> with results obtained in 1987 and 1988. The recent results show continued <br /> contamination in monitoring wells (MWs) 1-3 and nondetection in MWs 4-6. <br /> However, we disagree that the concentrations in MWs 1-3 are low. MWs 1 and 2 <br /> have elevated benzene levels of 7.9 µg/l and 34 gg/l , respectively, which are <br /> higher than the maximum contaminant level for drinking water of 1 Ag/1 . , <br /> Furthermore, since petroleum product constituents are not naturally occurring <br /> in the ground water beneath the facility, their detection indicates an impact <br /> to the quality of ground water at the site. Although contaminant <br /> concentrations have remained stable, the extent of contamination needs <br /> definition, and a remediation program must be implemented. Therefore, we <br /> request that you perform the tasks listed below in accordance with the listed <br /> schedules: <br /> TASK DUE DATE <br /> 1. Submit quarterly monitoring By the 30th of the month <br /> report following the reporting <br /> period <br /> 2. Submit a work plan to define lateral 20 November 1992 <br /> and vertical extent of soil and ground <br /> water contamination <br /> 3. Submit Problem Assessment Report (PAR) 60 days after work <br /> plan approval <br />