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of a site remediation performed by WHF Consultants. The excavated hydrocarbon- affected soils resulted from leaky underground storage tanks at the North Union Street site. Approximately 2,400 cubic yards of this soil are stockpiled at the West Weber Street site; the dimensions of the stockpile are approximately 125 x 260 feet and the depth ranges from I 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 in 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 sampling results from the North Union Street site (ICF Kaiser, 1995). E Two of the 20 soil samples collected had TPH concentrations exceeding the proposed soil cleanup levels of 100 mg/kg and 1,000 mg/kg for TPH-d and'TPH-o, respectively. Soil sample CS-13 had 5,500 mg/kg of TPH-d and 11,000 mg/kg of TPH-o; k sample CS-2 had 180 mg/kg TPH-d. Based on the grid spacing, the amount of soil represented by these samples is estimated to be approximately 300 cubic yards, assuming a 15% volume expansion accompanying movement of the soil. I The following section presents a plan for remediation of the 300 cubic yards of Class II waste with TPH concentrations exceeding the proposed soil cleanup levels. i 3.0 OFF-SITE DISPOSAL PLAN i Off-site disposal of the petroleum-affected soil in a Class II landfill could be 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 in Livermore. The Forward disposal facility, being closer to the site has the added I R4182OA-0102960-2 soilrem2.pin 2 i