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Y:c <br /> tl <br />17 <br /> r <br /> rIA Chevron USA. <br /> Page 16 <br /> lauring the following week, rain interrupted the normal tilling operation,which <br /> f <br /> resulted in minimal tilling for several days. <br /> f The next sampling of the tilled surface took place on October 3, 1990,without of <br /> the presence of Mr.Harlan Knolls,who would be on vacation for the next three weeks. <br /> Plastic,which was underlying the hydrocarbon-contaminated soil,was beginning to <br /> appear at several locations. In addition,an effort was made to Iocate the two <br /> monitoring wells that were under the area being tilIed..:One of the wells,near the <br /> Z x west side of the site (MW-1),was uncovered and staked to protect it from potential <br /> damage. Results of the October 3, 1990,sampling are shown in Table IX and locations <br /> z <br /> t" shown on Plate 11. <br /> TABLE IX <br /> Concentrations of Petroleum Constituents in Soil <br /> (Concentrations measured .in parts per million) <br /> s Date Collected: <br /> October 3, 1990 <br /> { sample <br /> T.D. Benzene Toluene Ethbnz. Xylenes T.P.H. <br /> 1 ABC <0.005 <0.005 <0.005 <0.015 <10 <br /> 2 ABC <0.005 <0.005 <0.005 0.02 <10 <br /> 3 ABC <01005 <0.005 <0.005 <0.015 <10 <br /> 4 ABC <0.005 <0.005 <0.005 <0.015 <10 <br /> 5 ABC <0.005 <0.005 <0.005 <0.015 <10 <br /> f 6 ABC <0.005 <0.005 <0.005 <0.015 <10 <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 /> V <br /> 16000-250-046 . - - <br /> U:.titE:� MooiiL <br />