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NISTATF 0 1: CALIFORNIA PETE WILSON. Govern: <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> CENTRAL VALLEY REGION <br /> 3443 ROUTIER ROAD, SUITE A <br /> SACRAMENTO, CA 95827-3096 z <br /> PHONE: (916) 361-5600 <br /> FAX (916) 361-5686 APR 4 3 IS92 <br /> ENI V 1 R <br /> Li jt. <br /> P EI-13M 1"'i <br /> 9 April 1992 <br /> Ms. Patricia Sullivan <br /> Environmental Services <br /> Pacific Gas and Electric Company <br /> P.O. Box 7640 <br /> San Francisco, CA 94120 <br /> PG&E's MCDONALD ISLAND SURFACE IMPOUNDMENTS, SAN JOAQUIN <br /> COUNTY (Case No. 2288) <br /> We have reviewed your letter of 15 January 1992 and the final grading plans for closure of <br /> PG&E's McDonald Island disposal ponds. The grading plans are acceptable as proposed. <br /> The Brown & Caldwell Closure Plan dated April 1991 is now complete. The plan to close <br /> this facility by removing all drilling mud waste and any contaminated native soil is <br /> approved with the following provisions. <br /> PG&E proposes to excavate the upper six inches of native soil underlying the drilling <br /> mud plus any visibly contaminated native soil above the water table. PG&E concludes <br /> this approach should eliminate all soil contaminants and prevent the possibility of any <br /> additional contaminants leaching into ground water. We request that PG&E conduct <br /> field sampling during excavation and provide us with analytical results which demon- <br /> strate that any contaminants remaining after excavation are not a threat to water quality. <br /> Please submit a brief sampling and analysis plan prior to excavation. <br /> If you have any questions, please call Steve Rosenbaum at (916) 361-5732 <br /> WILLIAM"J. MARSHALL, Chief <br /> Waste Discharge to Land Unit <br /> SER <br /> cc: Ms. Kim Schwab, California Integrated Waste Management Board, Sacramento <br /> Mr. Ed Padilla, San Joaquin County Public Health Services, Stockton <br />