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. Chevron U.S.A. <br /> Page 14 <br /> (approximately every 3 lifts) . A copy of Twining <br /> Laboratory's report is included in Appendix B. <br /> Soil excavated on March 19 and 20, 1990 that yielded <br /> "non-detected" field screening results was placed as fill in <br /> the western-most corner of the excavation. A composite <br /> sample, consisting of 3 discrete samples was taken of the <br /> soil and submitted to an analytical laboratory for chemical <br /> analyses. The results of analyses are presented in Table <br /> III . The location of fill is presented in Plate 7 . <br /> TABLE III <br /> Concentrations of Petroleum Constituents in Soil <br />• (Concentrations measured in parts per million) <br /> sample <br /> I.D. Benzene Toluene Ethbnz. Xylenes T.P.H. <br /> C-D13-3-A,B,C n/d n/d n/d n/d n/d <br /> Legend• <br /> Ethbnz. - Ethylbenzene <br /> T.P.H. - Total Petroleum Hydrocarbons <br /> n/d - Non-detected <br /> The placement of "clean" stockpiled soil as fill brought <br /> the bottom of the excavation to a depth of approximately 7 to <br /> 8 feet below finish grade. The remainder of the excavation <br /> is to be filled using treated soil (see section 5.3) on <br /> completion of the aeration process. <br /> 16000-250-044 <br /> Corrected <br /> Dx%*- & NtOORE <br />