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Chevron U.S.A. <br /> Page 8 <br /> Analytical chemical results,as shown in Table II revealed hydrocarbon <br /> contamination still present in a portion of those samples tested. These results <br /> revealed that the aeration process used to date,without tillage,was not thoroughly <br /> removing hydrocarbon contamination residues. It was then decided, at the suggestion <br /> l <br /> of Dames&Moore,that a more aggressive approach,including tilling aerating soils, <br /> be used. The original cycle of operation was to include approximately a 2.5 day <br /> $ aeration period,with tillage over approximately an eight hour period per day. These <br /> aactivities commenced on August 22, 1990,with the first lift tilled for 2.5 days. <br /> (Refer to the top photo on Plate 2.) Tilling activity would not include weekends, <br /> holidays, or periods found to be excessively windy, <br /> when dust control was a factor. <br /> - Samples taken on August 22, 1990.represented the last lift treated without <br /> ~' tilling. r.Harlan Knolls at the locations shown on <br /> Their sampling was directed by M <br /> S Plate 4. Their test results are presented in Table III. <br /> f 4 ' <br /> D sna <br />