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_ M'9 _�tkte' `' .� <br />$v` <br /> FIELD METHODS <br /> 1 echo of of Samples Fra Tank vi <br /> Soil from a sample location in the tank cavity is brougF* to the ground surface in an <br /> excavator bucket, and the outer soil is scraped away. A clean, 6-inch-long, 2-inch- <br /> diameter, clean brass tube is driven into the soil using a percussion sampler. The brass <br /> tube is removed and the ends are covered nih aluminum foil and plastic end caps and <br /> taped. The tube is labeled and immediately placed on ice for transport to the <br /> laboratory. Chain of Custody Records are initiated in the field and maintained <br /> throughout delivery to the laboratory. <br /> Collection of Samples From Stockpiled Soil and Aackfill Material <br /> Soil samples are collected from stockpiled soil and backfill material to evaluate <br /> treatment and disposal op'-ions. Four soil samples are collected for every 50 cubic yards <br /> of stockpiled soil. Each group of four sa:uples is composited into one sample by the <br /> laboratory. Soil samples are collected in clean brass tubes from approximately 6 inches <br /> below the surface of the stockpiles. The brass tube is removed and the ends are covered <br /> with aluminum foil and plastic end caps and taped. The tube is Iabeled and immediately <br /> placed on ice for transport to the laboratory. Chain of Custody Records are initiated in <br /> the field and maintained throughout delivery to the laboratory. <br /> A,oa/sed �Geo�ystems _ _ _: <br />