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Chevron U SA <br /> Page ].7 <br /> On October 10, 1990, Dames & Moore observed exposed plastic along most of the <br /> southern and western sides of the tilled area, with approximately one to one and one- <br /> half feet of hydrocarbon-contaminated soils yet to be tilled around the remainder of <br /> the excavation. The contractor estimated that he would complete the tilling operation <br /> of the remaining contarninated soils during the following week California Petroleum <br /> Inc. suggested they leave the last tilled lift of hydrocarbon-contaminated soil in <br /> place during the backfilling and compaction of the excavation This last-tilled lift <br /> would then be placed in the excavation following placement and compaction of the <br /> stockpiled treated soil The October 10, 1990 sampling locations are shown on <br /> Plate 12 and results of cherrucal analysis are summanzed on Table X. <br /> TABLE X <br /> Concentrations of Petroleum Constituents in Soil <br /> (Concentrations measured in parts per million) <br /> Date Collected: <br /> October 10, 1990 <br /> Sample <br /> T.D. Benzene Toluene Ethbnz. Xylenes T.P.H. <br /> 1 ABC <0.005 <0. 005 <0. 005 <0. 015 <br /> 2 ABC <0.005 <0. 005 <0. 005 <0. 015 " <br /> 3 ABC <0.005 <0. 005 <0. 005 <0. 015 ' <br /> 4 ABC <0.005 <0. 005 <0. 005 <0. 015 <br /> 5 ABC <0.005 <0. 005 <0. 005 <0. 015 <br /> Minimum <br /> Detection Limit 0.005 0. 005 0. 005 0. 015 10 <br /> Lecrend <br /> < - Less than T.P.H. -- Total Petroleum Hydrocarbons <br /> Ethbnz - Ethylbenzene n/d - Non-detected <br /> * - Results not provided by the laboratory <br /> 16000-250-044 <br /> I <br /> DAMES & MOORE <br />