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r <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 />• Z.D. Benzene Toluene Ethbnz. Xylenes_ T.P.H. <br /> C1-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 /> < - Less than <br /> 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 lifts <br /> have been placed. "Nondetected" lifts are picked up and <br /> 16000-250-044 <br /> Corrected <br /> Da\1 E5 & NiOORE <br />