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I . . <br /> STATE OF CALIFORNIA PETE WILSON. Govern--, <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> CENTRAL VALLEY REGION <br /> X <br /> 3443 ROUTIER ROAD, SUITE A ILP <br /> SACRAMENTO, CA 95827-3098U <br /> PHONE: (916) 361-5600 7z L <br /> FAX: (916) 361-5686 APR 13 1992 <br /> ENVI RON M HCALTH <br /> PERM <br /> 9 April 1992 <br /> Ms. Patricia Sullivan <br /> Environmental Services <br /> Pacific Gas and Electric Company <br /> P.O. Box 7640 <br /> 2 <br /> San Francisco, CA '94140 <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 /> WILLIAMI. 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 />