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MEN <br /> y X <br /> 4 <br /> Chevron U.S-A. <br /> Y 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, 1490,soils were spread in at <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 /> -detected"lifts were picked up and stockpiled <br /> photoionization detection meter. "Non <br /> and a new lift of contaminated soils was spread. Stockpiled,treated soil was <br /> composited and chemically analyzed. Location of composited sampling was at the <br /> direction of a representative of San Joaquin County Health Deparm W. <br /> Five lifts of aerated soils were stockpiled following"non-Vtectiaa'%as <br /> recorded,by field screening with a photoionization dctectinn d,41,e< The stocJq;J;. <br /> was sampled for chemical analysis on June 7, 1990. Tv-�Ide sw;--;aTnpies,each <br /> consisting of three composite samples,were taken'i.t l6cations by Mr, <br /> Harlan Knoll of the San Joaquin County Health De;artmeKit. ? ~zse s lrraplFr locations are <br /> - illustrated on Plate 3. Results of sample analyseD ire s,(mmL: d <br /> . �soao-zsa-a« <br /> S \ttiftFtF <br />