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GSI Field Methods and Procedures <br /> November 3, 1994 <br /> Field Screening of Soil Samples <br /> A PID Is used to perform head-space analysis In the field for the presence of <br /> organic vapors from the soil sample This test procedure Involves removing soil <br /> from the tip of the sampling device or sample liner Into a clean glass far, and <br /> Immediately covering the far with aluminum foil secured under a ring-type <br /> threaded lid After approximately twenty minutes, the foil is pierced and the <br /> atmosphere within the far tested using a PID Head-space screening results are <br /> recorded on the boring log Head-space screening procedures are performed and <br /> results recorded as reconnaissance data GSI does not consider field screening <br /> techniques to be verification of the presence or absence of hydrocarbons <br /> Storing and Sampling of Drill Cuttings <br /> Drill cuttings are stockpiled on plastic sheeting Stockpile samples are collected <br /> and analyzed on the basis of one sample per 50 cubic yards of soil Each <br /> stockpile sample is composed of 4 discrete sample tubes, composited in the <br /> laboratory prior to analysis Locations of each tube of stockpile soil sample are <br /> chosen arbitrarily. <br /> Each stockpile sample tube is collected by removing the upper 3 to 6 inches of <br /> soil, and them driving the stainless steel or brass sample tube into the stockpiled <br /> material with a hand, mallet, or drive sampler The sample tubes are then <br /> covered on both ends with teflon sheeting or aluminum foil, capped, labeled, and <br /> placed in a cooler with blue ice for preservation A chain-of-custody form is <br /> initiated in the field and accompanies the selected soil samples to the analytical <br /> laboratory. Stockpiled soils are covered with plastic sheeting after completion of <br /> sampling. <br /> 2 <br /> GeoStrategies Inc. <br />