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SAMPLING FROM STOCKPILES AND EXCAVATIONS <br /> Soil samples from stockpiles are composites, collected at a rate <br /> of one composite sample for every 100 cubic yards of soil . The <br /> composite sample consists of about three, and not more than four, <br /> individual soil samples of approximately equal volume . The <br /> individual soil samples will be collected using a decontaminated <br /> stainless steel trowel or an impact sampler. The soils will be <br /> packed into a 2-inch by 6-inch brass tube, and the ends of the tube <br /> will be covered with aluminum foil and plastic end caps . The end <br /> caps will be taped in place with duct or plastic electrical tape . <br /> The individual soil samples comprising the composite soil sample <br /> will be homogenized at the analytical laboratory. <br /> Soil samples from excavations will be collected using a <br /> decontaminated stainless steel trowel or an impact sampler. They <br /> will be packed individually into 2-inch by 6-inch brass tubes . The <br /> ends of the tubes will be covered with aluminum foil and plastic <br /> end caps, and the end caps will be taped in place with duct or <br /> plastic electrical tape. For deep excavations that are not safe to <br /> enter, the soil samples will be collected from the bucket of a <br /> backhoe or other excavating machinery, which has scraped soil from <br /> the excavation wall or floor, as directed by the on-site geologist. <br /> Soil samples from the product-piping trenches of underground <br /> storage tanks will be collected as described above, at a rate of <br /> one sample for every 20 feet of pipeline. <br /> Water samples from excavations will be collected by lowering <br /> into the cavity a decontaminated glass jar or bottle at the end of <br /> a rope or rod. The water in the glass container will be slowly <br /> poured into 40-milliliter vials to a height that forms a meniscus <br /> at the rim of the vial . The vials will be capped with lids having <br /> teflon septa, and they will be inspected to ensure that no air <br /> bubbles remain within . <br /> All samples will be labeled and handled as described in the <br /> Brown and Caldwell operating procedure entitled Sample Handling. <br />