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April 26, 1988 AGS Job No. 2005-P <br /> Delta Truck Sales, Stockton, California <br /> detergent (Alconox) and deionized water and rinsed at least twice <br /> with deionized water prior to collecting each sample. The sample <br /> shoe will also be steam cleaned prior to each sample. <br /> Quality assurance/quality control concerns will be addressed with <br /> duplicate and split samples. At least one duplicate soil sample <br /> will be collected for each six samples. The submission of <br /> duplicates will give an indication of variability of laboratory <br /> results and naturally occurring concentrations of compounds in <br /> j the soil. The duplicate samples will not be identified to the <br /> laboratory. In our opinion, trip blanks are not desirable in <br /> this soil sampling plan. <br /> Background Concentrations in Soil <br /> Naturally occurring background concentrations of analyzed <br /> substances in soil at the site will be evaluated by collecting <br /> samples from at least one additional excavation. The location of <br /> this excavation will be a minimum of 50 feet from the limits of <br /> the main excavation, and will be promptly backfilled after <br /> sampling. Sampling methods will be identical to those used in <br /> the impoundment excavation. A minimum of three samples and one <br /> duplicate will be collected from soil units similar to those <br /> 11 <br /> 1(. <br /> Applied GeoSystvms <br />