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GR Field Methods and Procedures <br /> Updated January 21 , 1999 <br /> Field Screening of Soil Samples <br /> A PID is used to perform head-space analysis in the field for the presence of organic vapors <br /> from the soil sample . This test procedure involves removing some soil from one of the <br /> sample tubes not retained for chemical analysis and immediately covering the end of the tube <br /> with a plastic cap . The PID probe is inserted into the headspace inside the tube through a <br /> hole in the plastic cap . Head-space screening results are recorded on the boring log . Head- <br /> space screening procedures are performed and results recorded as reconnaissance data. GSI <br /> does not consider field screening techniques to be verification of the presence or absence of <br /> i <br /> hydrocarbons . <br /> Storing and Sampling of Drill Cuttings <br /> Drill cuttings are stockpiled on plastic sheeting or stored in drums depending on site <br /> conditions and regulatory requirements . Stockpile samples are collected and analyzed on the <br /> basis of one composite sample per 50 cubic yards of soil. Stockpile samples are composed <br /> of four discrete soil samples , each collected from an arbitrary location on the stockpile . The <br /> four discrete samples are then composited in the laboratory prior to analysis . <br /> Each discrete stockpile sample is collected by removing the upper 3 to 6 inches of soil , and <br /> them driving the stainless steel or brass sample tube into the stockpiled material with a hand, <br /> mallet, or drive sampler . The sample tubes are then covered on both ends with teflon <br /> sheeting or aluminum foil , capped , labeled , and placed in a cooler with blue ice for <br /> preservation . A chain-of-custody form is initiated in the field and accompanies the selected <br /> soil samples to the analytical laboratory . Stockpiled soils are covered with plastic sheeting <br /> after completion of sampling . <br /> A-2 <br />