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Chevron U SA <br /> Page 16 <br /> i <br /> During the following week, rain interrupted the normal tilling operation, which J <br /> resulted in minimal tilling for several days <br /> 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 11 <br /> Plastic, which was underlying the hydrocarbon-contaminated soil,was beginning to 1 <br /> i <br /> appear at several locations. In addition, an effort was made to locate the two <br /> monitoring wells that were under the area being tilled. One of the wells, near the <br /> west side of the site (MW-1), was uncovered and staked to protect it from potential <br /> i <br /> damage Results of the October 3, 1990, sampling are shown in Table IX and locations <br /> shown on Plate 11. <br /> TABLE IX <br /> Concentrations of Petroleum Constituents in Soil <br /> (Concentrations measured in parts per million) <br /> Date Collected: <br /> October 3, 1990 <br /> Sample <br /> I.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 <0.005 <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 /> 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 /> 16000-250-044 • <br /> D�00ES & MOORE # <br />