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STATE OF CALIFORNIA—ENVIRONMENTAL PRS.-..TION AGENCY PETE WILSON,Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— , , <br /> CENTRAL VALLEY REGION — <br /> iii.:. <br /> 3443 ROUTIER ROAD,SUITE A _ <br /> SACRAMENTO,CA 95827-3098 . <br /> PHONE: (916)255-3000 (D4 0 C T 13 PH 4' 12 <br /> FAX: (916)255-3015 <br /> 12 October 1991 <br /> Mr. Jaime Troncoso <br /> Pacific Gas and Electric Company <br /> 123 Mission Street, Room H-1021 <br /> P. O. Box 770000 <br /> San Francisco, CA 94177 <br /> PG&E MCDONALD ISLAND SURFACE IMPOUNDMENTS, SAN JOAQ UIN <br /> COUNTY (Case No. 2288) <br /> We have reviewed your 30 September 1994 letter on cleanup levels for native soils underlying the <br /> former surface impoundment. The proposed attenuation factors for barium, chloride and sulfate are <br /> acceptable based on the analysis presented in your letter and the sample results from the excavation. <br /> We concur with the revised cleanup levels of 200 mg/l chloride, 5 mg/1 barium and 250 mg/1 sulfate <br /> based on waste extraction test method. Furthermore, we note that the 23 samples from the <br /> excavation have average concentrations significantly below the cleanup levels with average chloride <br /> near 50 mg/1,barium near 0.3 mg/l and sulfate near 30 mg/1. <br /> Based on the revised cleanup levels and available sample data, soil cleanup in the pond area appears <br /> complete and cover soil can be placed over the excavation area. If you have any questions, please <br /> call Steve Rosenbaum at(916) 255-3131. <br /> WILLIAM J. MARSHALL,Chief <br /> Waste Discharge to Land Unit <br /> SER <br /> cc:�. Greg Oliveira, San Joaquin County Public Health Services, Stockton <br /> Mr. Mike Heckathorn,Trident Environmental, Antioch <br />