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<br />~ <br /> <br />Woodward.Clyde Consultants <br /> <br />09G3 <br /> <br />~ <br /> <br />~ <br /> <br />density and a permeability rate in the order of 15,000 <br /> <br /> <br />feet/year when placed at 70% relative density (1.5 x 10-2 <br /> <br /> <br />cm/sec--medium permeability) (Table 2). We consider a <br /> <br /> <br />processed sand of this type should be sufficiently pervious for <br /> <br /> <br />the filter-drain. The filter system should be designed to meet <br /> <br /> <br />normally used filter criteria for adjacent soils and to carry <br /> <br /> <br />estimated water flows. <br /> <br /> <br />The shear strength values we assigned to this material are <br /> <br /> <br />given in Table 2. <br /> <br /> <br />5. Foundation Sands <br /> <br /> <br />Numerous NX drill holes have been drilled by the Bureau <br /> <br /> <br />along the proposed dam axis as shown on the Geologic Profile, <br /> <br /> <br />Figure 2 (Bureau's unnumbered drawing). Based on the data from <br /> <br /> <br />several NX drill holes and the most recent Denison sample hole <br /> <br /> <br />DD-30A, we classified the aeolian and alluvial soils to be <br /> <br /> <br />encountered between the base of the dam and the pierre <br /> <br /> <br />formation as silty sands (SM), with some borderline silty sands <br /> <br /> <br />to well graded sands (SM-SW). Denison samples from hole DD-30A <br /> <br /> <br />were inspected at the Bureau's laboratories. The results of <br /> <br /> <br />gradation, plasticity, density and moisture tests were reported <br /> <br /> <br />in a Bureau Memorandum dated November 3, 1977 (Ref 11). The <br /> <br /> <br />results of density tests on the Denison samples showed rather <br /> <br /> <br />low density conditions ranging from 83 to III pcf and averaging <br /> <br /> <br />102.0 pcf (dry density) for 8 samples tested. Low density <br /> <br /> <br />conditions were also indicated in other exploration holes in <br /> <br />. <br /> <br />~ <br /> <br />. <br /> <br />t <br /> <br />t <br /> <br />. <br /> <br />. <br /> <br />- 14 - <br /> <br />t <br /> <br />(I <br />