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} <br /> Chnron U.S-A, _ <br /> Page 16 <br /> During the following week,rain interrupted the normal tilling operation,which <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. <br /> Plastic,which was underlying the hydrocarbon-contaminated soil,was beginning to <br /> appear at several locations. In.addition, an effort was made to locate the two <br /> monitoring wells that were under the area beinb 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 /> 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 /> i- 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 /> ,- Lerrend• <br /> ... <br /> ` .. ess than ..... fi.P.E. ._ Total Petroleum Hydrocarbons. ... <br /> Ethbnz - Ethylbenzene n/d - Non-detected <br />