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L � <br /> Woodward-Clyde <br /> piping was approximately 16-inches below ground surface (bgs). The depth to the bottom <br /> of the UST was approximately 6.5 feet bgs. <br /> The UST was transported by Rich Hamilton Trucking to A & S Metals, 1616 Angelo Way, <br /> Modesto, California. Tank rinseate was transported by Allied Petroleum to Refineries <br /> Service, 13331 North Highway 33, Patterson, California under hazardous waste manifest <br /> #93267136. Approximately 18 cubic yards of diesel contaminated soil excavated during the <br /> tank removal was transported by Rich Hamilton Trucking to Forward Incorporated Landfill <br /> of Stockton, California under non-hazardous waste manifest job acceptance # 94-671. <br /> Upon the removal of the UST, one small hole was observed on the bottom of the tank <br /> beneath the fill end (north end). During excavation activities five soil samples were collected <br /> by WCFS under the direction of Ms. Eleanor Ratliff (SJCEHD). Soil samples were <br /> collected from beneath the tank and piping areas and the excavated stockpiled soil (Figure <br /> 3). Detectable concentrations of 9,000 mg/Kg TPH as diesel were reported for a sample <br /> collected beneath the bottom of the north end of the UST at a depth of 17.9 feet bgs. A <br /> summary of analytical results of soil samples collected during the tank removal activities is <br /> presented in Table 1. <br /> V <br /> The UST excavation was backfilled by SEMCO with imported sand, clean excavated material <br /> and imported pea gravel under the approval of SJCEHD and WCFS. The excavation was <br /> lined with a polyethylene sheeting material across its east and west walls (See photographs <br /> 11 and 12 May, 1994 WCFS Report). The backfill materials were placed above the <br /> " polyethylene sheeting to approximately 10-inches bgs then covered over with the remaining <br /> ends of the sheeting. The excavation was completed to surface grade with clean excavated <br /> soil. A summary of the regional and local hydrogeology is presented next. <br /> 1.3 REGIONAL AND LOCAL HYDROGEOLOGY <br /> The following summary of regional and local hydrogeology comes from United States <br /> V <br /> Geological Survey Professional Paper 1401 - "Ground Water in the Central Valley <br /> California-A Summary Report on Regional Aquifer System Analysis", 1991, by Bertoldi, <br /> Johnston, and Evenson. <br /> V <br /> 8054/FEMA/KJAXPMR.RPr/8-24-95 SAC 1-3 <br /> v <br />