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SOO'39dd 66:8 06, 6t 100 <br />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 arepre-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 transfenred 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 />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 harnmer 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 />