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