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i Street site; the dimensions of the stockpile are approximately 125 x 260!feet and the depth ranges from 1 to 3 feet. Twenty soil samples were collected in 40-foot intervals from a grid constructed on the soil stockpile in August, 1995. The soil samples were analyzed for benzene,•toluene, ethylbenzene, and xylenes (BTEX) and TPH'jn the gasoline range (TPH-g), kerosene range (TPH-k), diesel range (TPH-d), and oil range (TPH-o) by American Environmental Network (AEN) Laboratory, a State-certified environmental laboratory. The results of this sampling .effort were presented with the third quarter groundwater I� sampling results from the North Union Street site (ICF Kaiser, 1995). Only one of the-20 soil samples collected had TPH concentrations,exceeding the proposed soil cleanup .levels. This soil sample (CS-13) had concentrations of 5,500 mg/kg E TPH-d and 11,000 mg/kg TPH-o, which exceed the proposed cleanup levels of 200 mg/kg and 1,000 mg/kg for TPH-d and TPH-o, respectively. Based on the grid spacing, the amount of soil represented by the sample CS-13 results is estimated to;be approximately 150 cubic yards, assuming a 15% volume expansion accompanying movement of the soil. The following section presents a plan,for remediation of the 150 cubic yards of Class II waste with TPH concentrations exceeding the proposed soil cleanup levels. 3.0 OFF-SITE DISPOSAL PLAN Off-site disposal of the petroleum-affected soil in a Class II landfill could be I completed in approximately four to six weeks. The Forward Landfill in southern Stockton has lower disposal costs than the next nearest disposal facility, the BFI'landfill k in Livermore. The Forward disposal facility, being closer to the site has the added advantage of reduced trucking costs. The estimated costs in-Table 1 assume disposal at the Forward facility. R4182OA-1222950-2 soilrem.pin 2