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r Pyr <br /> r-+ <br /> As a standard procedure, Chain-of-Custody forms were <br /> completed at the time of sampling and accompanied the samples <br /> to the laboratory. An example of the Chain-of Custody form <br /> used is shown in Appendix D. <br /> SOIL CHARACTERIZATION <br /> Soils in the upper 10 feet were characterized as fill <br /> material used to backfill the excavation left by the removal <br /> of the tanks. This material consisted of rubble and gravel <br /> in a soil matrix varying from sandy clay loam to loamy sand <br /> and sandy loam. Underlying the fill material is a silty clay <br /> which extended in most borings to 25 or 30 feet below the <br /> i <br /> ground surface. The silty clay was slightly moist to dry <br /> with a strong platy structure. One gravel lense and other <br /> - lenses of medium to coarse sand. were found in the silty clay <br /> below 30 feet. <br /> DISPOSAL OF SOIL CUTTINGS <br /> i <br /> f <br /> The soil cuttings from the borings were placed in three <br /> labeled 55-gallon drums pending completion of laboratory: <br /> analyses.: Disposal of the cuttings will be in accordance <br /> with applicable local, state and federal regulations. The <br /> bore holes were backfilled with unrefined bentonite to <br /> approximately 3 feet below grade. Grout was used to fill the <br /> remaining 3 feet to grade. The components and ratios of the <br /> grout mix were discussed and agreed upon with a <br /> representative from the San Joaquin County Public Health <br /> Services who was present on the site. <br /> LABORATORY ANALYTICAL RESULTS <br /> All samples were analyzed for Total Petroleum Hydrocarbons by <br /> EPA Method .8015 modified. Results of the sample analyses are <br /> summarized in Table 1. Laboratory reports are shown in <br /> 9 <br />