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• k`l KLEIN FELDER <br /> ' 3 METHODOLOGY <br /> 1 <br /> 3.1 DRILLING OF SOIL BORINGS <br /> ' Three soil borings will be drilled within the SI at locations selected by <br /> ' our field personnel. Each boring will extend to a depth of five feet <br /> below grade. The purpose of these borings is to collect soil samples for <br /> ' chemical analyses and lithologic information. <br /> The soil borings will be drilled using a truck—mounted drill rig equipped <br /> ' with 8—inch hollow stem augers. During drilling, an experienced <br /> environmental geologist will classify the subsurface soils, collect and <br /> ' preserve samples, and log the boreholes. The Unified Soil Classification <br /> System (USCS) will be the basis for soil type classification. The soil <br /> ' borings will be completed by backfilling to grade with bentonite. <br /> Distilled water will be used to activate the bentonite pellets thereby <br /> sealing off the borehole from surface water infiltration. <br /> t To minimize cross—contamination, all augers and associates equipment will <br /> be steam cleaned prior to the drilling of each borehole. The sampling <br /> equipment will be cleaned with a trisodium phosphate wash and a distilled <br /> ' water rinse prior to the collection of each soil sample. <br /> 1 <br /> 1 <br /> 51-87-413 3 <br />