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G -R Field Methods and Procedures 1, <br />An alternative method involves placing a plastic cap over the end of the sample tube. The <br />PID probe is placed through a hole in the plastic cap, and vapors with the covered tube <br />measured. Head -space screening is performed and results recorded as reconnaissance data <br />only. GSI does not consider field screening techniques to be verification of the presence <br />or absence of hydrocarbons. <br />Storing and Sampling of Soil Stockpiles <br />excavated material is stockpiled on and covered with plastic sheeting. Stockpile samples <br />are collected and analyzed for disposal classification on the basis of one composite sample <br />per 100 cubic yards of soil. Stockpile samples are composed of four discrete soil samples, <br />each collected from an arbitrary location on the stockpile. The four discrete samples are <br />then composited in the laboratory prior to analysis. <br />Each discrete stockpile sample is collected by removing the upper 12 to 18 inches of soil, <br />and them driving the stainless steel or brass sample tube into the stockpiled material with <br />a mallet or drive sampler. The sample tubes are then covered on both ends with teflon <br />sheeting, capped, labeled, and placed in a cooler with blue ice for preservation. A chain - <br />of -custody form is initiated in the field and accompanies the selected soil samples to the <br />analytical laboratory. Stockpiled soils are covered with plastic sheeting after completion <br />of sampling. <br />A-2 <br />