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of soil and pushing a clean, 6-inch-long, 2-inch-diameter, brass <br /> sample tube into the soil until completely full . The ends of the <br /> sample tubes will be covered with aluminum foil and sealed with <br /> plastic end caps. The samples will be labeled, placed in a cooler <br /> with ice, entered on a Chain-of-Custody form and transported to a <br /> State-certified laboratory. Samples collected in the gasoline UST <br /> area will be analyzed for total petroleum hydrocarbons (TPH) as <br /> gasoline, benzene, toluene, ethylbenzene, and xylene (BTEX) <br /> according to EPA Method 8015/8020. Samples collected beneath the <br /> used oil UST will be analyzed for the same constituents as well. as <br /> TPH-diesel , oi) and grease, chlorinated solvents using EPA Method <br /> 8010 and semi-volatile solvents using EPA Method 8270 . <br /> Additionally, product piping will. be removed from around the <br /> existing pump islands. The piping trench will be excavated to an <br /> approximate depth of four feet and the area sample at the junctions <br /> of piping and once every twenty feet along street piping runs. <br /> Samples will be analyzed by a State-certified laboratory for TPH- <br /> ga.soline and BTEX using Method 8015/8020 . <br /> 3 . 2 Overexcavatior_ and Source Removal. <br /> Soil in and around the former station facilities (USTs and product <br /> piping) will be visually inspected for evidence of hydrocarbon <br /> impact. Overexcavation will occur in these areas if analytical <br /> results collected during facility removal indicate that further <br /> source removal would be beneficial. Confirmation samples will be <br /> collected at excavation limits. The limits of the excavation will <br /> be determined by one or more of the following conditions; <br /> x Field screening indicated that the excavation is at <br /> sufficient depth/extent to remove the contaminate areas <br /> of the suspected source. <br /> * Analytical results of confirmation samples identify <br /> residual hydrocarbons as below 100 ppm TPH-gasoline. <br /> * The cost/benefit of further excavation is evaluated to <br /> be unfavorable with respect to other options. <br /> * Excavation is limited by surface improvements (sidewalks, <br /> utilities, buildings, etc. ) <br /> Groundwater is encountered. <br /> Practical limits of excavation equipment are reached. <br /> Field screening will be performed visually and/or with a hand-held <br /> photoionization detector or a Hanby kit. verification samples will <br /> be collected from the excavation on approximately 20 foot centers. <br /> 2 <br />