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Chevron U SA <br /> Page 6 <br /> 5 2 Soil Aeration <br /> Aeration of stockpiled soil began on March 20, 1990 During the first several <br /> months of the aeration process, until August 22, 1990, soils were spread in an <br /> approximately 12-inch-thick lift over plastic. The lift was exposed to air and <br /> sunlight and left in place as needed to achieve a"non-detected" reading from a <br /> photoioruzation detection meter "Non-detected" lifts were picked up and stockpiled <br /> and a new lift of contaminated soils was spread. Stockpiled, treated soil was <br /> composited and chenucally analyzed Location of composited sampling was at the <br /> direction of a representative of San Joaquin County Health Department. <br /> Five lifts of aerated soils were stockpiled following "non-detection", as <br /> recorded by field screening with a phototonization detection device The stockpile <br /> was sampled for chemical analysis on June 7, 1990 Twelve soil samples, each <br /> consisting of three composite samples, were taken at locations specified by Mr <br /> Harlan Knoll of the San Joaquin County Health Department. These sample locations are <br /> illustrated on Plate 3 Results of sample analyses are summanzed in Table II <br /> 16000-250-044 <br /> D-\\!ES & MOORE <br />