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The laboratory analysis also indicated that the soil samples collected from the soil stockpile associated with <br /> the diesel fuel excavation did not contain detectable concentrations of TPH or BTEX. However,the analysis <br /> indicated that one of the soil samples collected from the soil stockpiles associated with the gasoline <br /> excavation contained TPH concentrations of 630 and 1,300 parts per million and BTEX concentrations of <br /> 0.88,25, 7.2,and 83 parts per million,respectively. An additional soil stockpile sample associated with the <br /> gasoline excavation contained trace amounts of Xylenes and MTBE. <br /> Following completion of the soil sampling,the tank excavation was backfilled to within four to six inches <br /> of the site grade with imported fill material and a portion of native soil. The soil was compacted in <br /> accordance with appropriate standards and the excavation was resurfaced with asphalt to match the <br /> surrounding grade level. Approximately 30-50 cubic yards of native soil was left stockpiled on site <br /> following the backfilling and resurfacing program. <br /> 1.2 SOIL TREATMENT PROGRAM <br /> Following the completion of the tank removal program,Blaes Environmental coordinated with Amerco Real <br /> Estate Company/IJ-Haul International to remove and treat the stockpiled soil that remained on the site from <br /> the tank removal activities. hi February 1997,the stockpiled soil was loaded into a transport vehicle and <br /> transported to the TPS Technologies(TPS)fixed thermal desorption treatment plant located in Richmond, <br /> California. The soil was treated at the TPS facility and the treated soil was sampled to confirm that the <br /> petroleum hydrocarbons in the soil were destroyed by the thermal desorption process. Following successful <br /> treatment, the soil was used by TPS as backfill material for the West Contra Costa Sanitary Landfill in <br /> Richmond, California. <br /> �" 2 <br />