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Chevron U.S.A. <br /> Page 4 <br /> On completion of the excavations,soil samples were to be obtained as directed by <br /> the county representative,who was present at the site. Samples were to be taken to <br /> evaluate the concentration of the petroleum hydrocarbons. The San Joaquin County Air <br /> Pollution Control District evaluated the test results and established aeration <br /> criteria for their permit. <br /> r ' Excavated petroleum-contaminated soils were to be spread in lifts and aerated. <br /> 4� <br /> i Aerated soils were to be periodically composite-sampled and chemically analyzed to <br /> i- <br /> r ;f <br /> evaluate the presence of remaining petroleum. At the request of the Central Valley <br /> Regional Water Quality Control Board, treated soils were to be used as compacted fill <br /> i� <br /> for backfilling the excavations. <br /> 5.0 REMEDIAL ACTION <br /> t <br /> Site activities associated with the aerationportion of the soil remediation <br /> } process o-)mmenced on March 20, 1990, The first few months of the aeration process <br /> consisted Uf spreading hydrocarbon-contaminated soil and allowing it to aerate for <br /> several weeks without being tilled. This process continued until August 22, 1990, <br /> when a more aggressive aeration process commenced which included tilling each lift of <br /> i contaminated soil for several days. <br /> { <br /> . 15000-250-044 <br /> j <br /> D:1\1[:s 4 MO ORE <br />