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: - <br /> � � v <br /> rg <br /> 11091% <br /> REINS$ fp <br /> OWN <br /> i <br /> 12 <br /> GOLDEN GRAIN COMPANY <br /> December 21, 1989 <br /> 202/799-5045.06 <br /> 3.3.2 Soil Sampling <br /> During drilling, soil samples were collected using two <br /> methods, drive sampling (in borings for MW-9, MW-10, MW-111 <br /> and <br /> MW-13) and continuous coring (MW-12 and MW-14) : <br /> 1) An is-inch-long California split-spoon sampler, fitted <br /> with brass tunes 2 inches in diameter and 6 inches <br /> long, was driven ahead of the augers at 5-foot <br /> intervals in MW-9, M41-10, MW-11, and MW-13. <br /> 2) A 5-foot-10ng continuous sample tube system with a 3- <br /> inch inside diameter (I.D.) was used in MW-12 and MW- <br /> 14. As proposed in the revised work plan, an attempt <br /> was made to compile a complete, detailed geologic <br /> record of the subsurface materials in three well <br /> boreholes by obtaining continuous cores. Samples were <br /> collected from chosen intervals with brass tubes. <br /> ! Forty percent recovery was achieved in MW-12, while <br /> better than 50 percent of borehole materials was <br /> recovered in MW-14. Part of the coring mechanism <br /> failed during the first few feet of MW-13, so con- <br /> tinuous coring was not possible in that boring. <br /> The tubes containing the collected soil samples were sealed <br /> with aluminum foil, TeflonR caps, and duct tape; labeled; and <br /> packed on ice. Samples were screened in the field using a <br /> photoionization detector (PIA) . Two or three samples from each <br /> boring were chosen for laboratory analysis on the basis of PID <br /> readings (the highest readings) , type of soil, or position of the <br /> _._ ......_. <br /> sample in relation to the water table (closest to the water <br /> table) . Table 1 Shaws the- depths- at-which- the-seleated.-samples <br /> - were collected. <br /> GROUNOwATBlt <br /> TF:C1iNOLOGY,INC. <br />