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w.. <br /> - 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 /> Iaboratory. 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 ,)n 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 /> I threshold limit value sniffer. In either case, the instrumentp robe is held <br /> adjacent to freshly crumbled soil and the stabilized reading value is recorded <br /> ! J on the log. Other visual screening techniques include examination of the <br /> sample under hand-leas magnification as-well-as floating sheen inspection <br /> resulting from immersion in water. <br /> i. <br /> 6) Samples are held in the possession of Exceltech personnel until transferred to <br /> g 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 /> l IY. SOIL SAMPLING BY HAND <br /> � ' 1) Some situations require that samples be collected by hand without the <br /> Aa assistance of a drill rig (e g., soil stock piles, excavation sidewall sampling, <br /> r etc.). When possible, soil samples will be collected using a steel core sampler <br /> E <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 /> k <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 /> 3 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 /> _ <br /> _ <br /> sampling of Che-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 /> - i <br />