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at a location selected by the Contracting Officer for <br /> possible hydrocarbon remediation. <br /> b. Piping associated with the tanks will be drained, with <br /> the wastes flushed into the tanks. Piping will be <br /> removed and cleansed. Piping no longer exhibiting <br /> compound residues will be disposed of as non-hazardous <br /> waste. The above-ground vent piping is expected to be <br /> clean; however, it will be cleansed also, and then <br /> disposed of as non-hazardous waste if no residues are <br /> present. <br /> C. The tanks will be pumped to the extent possible to remove <br /> any residual waste contents. The waste will be properly <br /> containerized and sent to an appropriate off-site <br /> recycling or disposal facility. <br /> d. The tanks will be visually inspected for any evidence of <br /> leakage (e.g. cracks, holes, corrosion, or oil residue on <br /> the outside tank surface) . The results of the inspection <br /> will be documented. <br /> e. The tanks will be degassed by adding dry ice pellets <br /> (approximately 1.5 to 2 pounds per 100 gallons of tank <br /> capacity) , which displaces hydrocarbon, oxygen and other <br /> vapors. <br /> f. If necessary, the excavated tanks will be cleaned and <br /> degassed again, depending on how thoroughly the tanks <br /> were cleaned and degassed prior to removal. <br /> g. The tank openings are then plugged or capped, and the <br /> tanks are removed and placed on a plastic lined surface <br /> for subsequent disposal or placed directly onto a truck <br /> for transportation to an appropriate disposal facility. <br /> Additional dry ice is then added to the tank at this <br /> time, to maintain low concentrations of hydrocarbon, <br /> oxygen and other vapors during transport of the tanks. <br /> h. The soil surfaces in the excavated pit will be visually <br /> inspected for discoloration or staining and the results <br /> documented. Fill material will be removed until native <br /> soils are reached. Soil samples from obviously stained <br /> native soils will be collected and analyzed for the <br /> parameters listed on Table 1. Table 1 also lists the <br /> analytical methods to be performed. Non-stained soils <br /> will also be removed from the pit, but no more than two <br /> feet (laterally or vertically) beyond the limit of soil <br /> staining. The non-stained excavated soil will be placed <br /> on plastic sheeting and a composite sample for each 50 <br /> cubic yards or one from each tank area excavation will be <br /> collected. Depending upon the analytical results of this <br /> sample, the material will be disposed of accordingly. <br />