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B - q <br /> Chevron U.S.A. <br /> Page 15 <br /> 5.3 Soil Aeration <br /> Aeration of stockpiled soil was started on March 20, <br /> 1990. As permitted by the San Joaquin County air Pollution <br /> control District, less than 540 cubic yards of soil was <br /> - aerated on any one day. Composite sampling and analysis of <br /> stockpiled soil was used by the district to determine the <br /> maximum allowable yardage to be aerated. Results of <br /> composite sampling is presented in Table IV. <br /> TABLE IV <br /> Concentrations of Petroleum Constituents in Soil <br /> = (Concentrations measured in parts per million) <br /> Sample <br /> Y.b. Henzene Toluene Ethbnz. Xylenes T.P.H. <br /> Cl-A,B,C n/d 0.007 n/d 0.006 1.1 <br /> -C2-A,B,C <0.025 0.027 0.031 0.093 150 <br /> C3-A,B,C n/d 0.011 0.012 0.054 29 <br /> Legend: <br /> i <br /> < - Less than <br /> 4 Ethbnz - Ethylbenzene <br /> T.P.H. - Total Petroleum Hydrocarbons <br /> n/d -.Non-detected <br /> The soil is aerated by loosely spreading a lift about 1 <br /> - foot thick over plastic. The lift is exposed to air and <br /> sunlight and left in place as needed to achieve "none- <br /> detected" readings with an Hnu meter. To date, five V.fts <br /> ....._. __........ <br /> have, been <br /> placed. on-detected" lifts are picked up and <br /> 16000-250-044 <br /> Corrected <br />