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1 <br /> fr <br /> Q-R Field Methods and Procedures <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 /> Stgring and Sampling of Soil Stockp m <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 <br /> hain- <br /> ofcustody 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 /> f `'; A-2 <br />