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April 26, 1988 AGS Job No. 2005-P <br /> Delta Truck Sales, Stockton, California <br /> Isolation of Excavated Contaminated Soil <br /> Kip Prahl Associates has proposed that the area of the former <br /> impoundment be excavated, using a backhoe or other suitable <br /> excavating equipment, and that the exhumed waste material be <br /> disposed of so that only clean material remains on site. During <br /> excavation, a continuous subjective evaluation will be utilized <br /> to segregate "contaminated" soil from "clean" soil on the basis <br /> of noticeable odor, visible discoloration, moistness, or other <br /> subjective evidence of contamination. A field photoionizing <br /> hydrocarbon vapor detector will be used as an evaluating tool and <br /> may assist in providing additional evidence of the degree of soil <br /> contamination. The respective soil piles will be isolated from <br /> each other pending chemical analyses to verify the levels of <br /> contamination in both piles. <br /> Applied GeoSystems recommends that both soil piles be temporarily <br /> placed on two to three layers of plastic sheeting (Visgine) with <br /> a thickness of approximately 0. 01 inches. The sheets should be <br /> i <br /> laid so that sheet edges overlap by several feet, thus reducing <br /> the likelihood of leachate migration into the soil below the <br /> Piles. The ground below the temporary storage piles should be <br /> smoothed and sharp objects removed to reduce the possibility of <br /> 5 <br /> A00/led GeoSv_atam_c <br />