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labeled, logged on chain-of-custody forms and stored in a chilled ice chest for <br /> preservation in the field and during transport to the analytical laboratory. All <br /> labels are pre-written with indelible ink to minimize handling time. <br /> 5) Samples are checked for the presence of contamination in the field by the <br /> geologist. Any discoloration or odor is noted on the boring log. Each sample is <br /> classified in the field by a geologist using the Unified Soil Classification System <br /> and a Munsell soil color chart. In addition, samples may also be field-screened <br /> with a photo ionization detector(calibrated daily) or threshold limit value sniffer. <br /> In either case, the instrument probe is held adjacent to freshly crumbled soil and <br /> the stabilized reading value is recorded on the log. Other visual screening <br /> techniques include examination of the sample under hand-lens magnification as- <br /> well-as floating sheen inspection resulting from immersion in water. <br /> 6) Samples are held in the possession of Exceltech personnel until transferred to the <br /> analytical laboratory. Transfer to the laboratory is accomplished with either <br /> delivery by Exceltech personnel, pick-up by laboratory personnel, or transfer by <br /> a personal delivery service. Each transfer of responsibility is recorded on a <br /> chain-of-custody log that accompanies the sample. <br /> II. SOIL SAMPLING BY HAND <br /> 1) Some situations require that samples be collected by hand without the assistance <br /> of a drill rig (e.g., soil stock piles, excavation sidewall sampling, etc.). When <br /> possible, soil samples will be collected using a steel core sampler equipped with <br /> clean brass liners which is advanced into the soil with a slide hammer. In other <br /> cases, the outer surface of the soil is removed and a brass liner is driven into the <br /> soil by hand or with a hammer. To avoid damaging the liner, a block of wood is <br /> held next to the liner so that the hammer strikes the block rather than the liner. <br /> The liner is removed and handled as described above. In deep excavations where <br /> safety factors preclude the direct sampling of the bottom or side wall, soil is <br /> retrieved by a backhoe bucket and this soil is sampled. <br /> EXCELTECH, INC. <br /> Soil Sampling Protocol <br /> Latest Revision: March 28, 1990 <br />