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April 26, 1988 <br /> Delta Truck Sales, Stockton, California AGS Job No. 2005-P <br /> barricades) where access is not blocked by fencing to prevent <br /> accidental entry by site employees. <br /> Excavation should be scheduled for the dry season. If rainfall <br /> appears likely prior to processing of laboratory data, imported <br /> clean fill material should be brought in to backfill the <br /> excavation, and the area should be covered with plastic. If p0 <br /> contamination is detected at the limits of the initial <br /> excavation, the backfill material can be re-excavated, if <br /> i <br /> necessary. If the excavation is significantly deeper than <br /> I <br /> �i <br /> expected or if the walls are unstable, the pit walls should be <br /> stabilized by backfilling or other suitable procedure regardless <br /> of the weather. <br /> I <br /> Sampling Plan <br /> I <br /> ; <br /> i � <br /> A combination of systematic and selective sampling techniquesI <br /> I <br /> will be used to evaluate the degree of contamination in the soil <br /> at the limits of the excavation. This samplingla � I <br /> plan is � <br /> statistically meaningful and is a valuable means for evaluating <br /> i <br /> the representative soil quality. The base of the excavation will <br /> be divided into four cells, each approximately 20 feet by 10 <br /> feet, as shown in Plate 3 . Each cell will be subdivided into <br /> 8 <br />