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Chevron U SA <br /> . Page 8 <br /> Analytical chemical results, as shown in Table 1:I 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 /> of Dames & Moore, that a more aggressive approach, including tilling aerating sods, <br /> be used. The onginal 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 /> activities 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, when dust control was a factor <br />. Samples taken on August 22, 1990 represented the last lift treated without <br /> tilling Their sampling was directed by Mr Harlan Knolls at the locations shown on <br /> Plate 4 Their test results are presented in Table III <br /> 16000-250-046 <br /> DANtr—s Sc TMOORE <br />