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Y <br /> sv <br /> k� <br /> Chevron USA. <br /> Page 17 <br /> 1� <br /> j . 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 hydrocarbin-contaminated soils yet to be tilled around the remainder of <br /> r a the excavation. The contractor estimated that he would complete the tilling operation <br /> 0f the remaining contaminated soils during the following week. California Petroleum <br /> t7lji-i <br /> Inc. suggested they leave the last tilled lift of hydrocarbon-contaminated soil in <br /> Y place during the backfilling and compaction of the excavation. This last-tilled lift <br /> s would thein 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 /> 47 ` Plate 12 and results of chemical analysis are summarized on Table X. <br /> k TAB LE X <br /> Concentrations of Petroleum Constituents in soil <br /> (Concentrations measured in parts per million) <br /> : `^ <br /> Date Collected: <br /> October 10, 1990 <br /> �.: Sample <br /> I.A. Benzene Toluene Ethbnz. XVlenes T.P.H. <br /> i 1 ABC <0.005 <0.005 <0.005 <0.015 <br /> 2 ABC <0.005 <0.005 <0.005 <0.015 <br /> i � 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 a <br /> Minimum <br /> Detection Limit 0.005 0.005 0.005 0.015 10 <br /> Legend: <br /> < - Less than T.P.H. -- Total Petroleum Hydrocarbons <br /> + Ethbnz - Ethylbenzene n/d - Non-detected <br /> �' t - Results not provided by 'he laboratory <br />