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0 0 <br />versus gasoline USTs/piping areas. A Photoionization <br />Detector (PID) will also be used to field screen soil and <br />segregate them by contaminant concentration. Soil generated <br />from the waste oil UST, oil/water separator, or hoists will <br />be profiled separately. If analytical results (discrete <br />samples collected every 25 cubic yards) indicate that soil <br />is below 10 Parts Per Million (ppm) Total Petroluem <br />Hydrocarbons (TPH) as gasoline or oil and .005 ppm benzene <br />then the soil will be considered acceptable for backfill and <br />stockpiled onsite for reuse. <br />Soil generated by excavating potential source areas will be <br />segregated and sampled. Discrete soil samples will be <br />collected for approximately every 25 cubic yards, and sets <br />of four discrete samples will be composited into one at the <br />laboratory to characterize approximately every 100 cubic <br />yards. Stockpiled soil slated for off-site disposal would be <br />those where TPH as oil are greater than 10 ppm. If the only <br />contaminant is gasoline and is greater than 10 ppm, then an <br />aeration permit will be obtained from San Joaquin Valley <br />Unified Air Pollution Control District (SJVUAPCD) to perform <br />aeration for these stockpiles until acceptable for reuse as <br />onsite backfill. <br />Aeration will be performed in compliance with SJVUAPCD's <br />permit by spreading the allowable volume of soil per day <br />into thin lifts approximately 8 to 10 inches thick. The soil <br />will then be mechanically tilled and turned to allow for <br />maximum volatilization. When aeration is suspected to be <br />complete, the soil will be resampled at a frequency of one <br />discrete sample per 25 cubic yards, on a grid interval until <br />TPH and benzene are below already set limits. <br />Soil stockpile samples will be collected by removing the top <br />6 to 12 inches of soil in each stockpile, then pushing a <br />sample tube into the soil until completely full. Samples <br />will be sealed, labeled, recorded on a Chain -of -Custody form <br />and transported in a cooler with ice to the laboratory. <br />3.3 Schedule for Implementation <br />Onsite activities are expected to commence in September <br />1996, after the acceptance of this work plan. After USTs are <br />removed, overexcavation activities, aeration/disposal are <br />expected to be completed within a two month period, weather <br />permitting. <br />A comprehensive report of activities will be submitted <br />within 45 days after completion of field activities. <br />3 <br />