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STATE OF CALIFORNIA <br />CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD -1 <br />CENTRAL VALLEY REGIO%V- <br />3443 ROUTIER ROAD, SUITE A <br />SACRAMENTO, CA 95827-3098 <br />PHONE- (916) 361-5600 <br />FAX (916) 361-5686 <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 Islaifd 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 />RM, <br />cc: Ms. Kim Schwab, California Integrated Waste Management Board, Sacramento <br />Mr. Ed Padilla, San Joaquin County Public Health Services, Stockton <br />PETE WILSON. Gov <br />Mp <br />APR <br />13 1992 <br />PE PA N1 F] <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 Islaifd 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 />RM, <br />cc: Ms. Kim Schwab, California Integrated Waste Management Board, Sacramento <br />Mr. Ed Padilla, San Joaquin County Public Health Services, Stockton <br />