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<br />Woodward.CIyde Consultants <br /> <br />..- :""'1.-..,' <br />~~~J <br /> <br />. <br /> <br />density and a permeability rate in the order of 15,000 <br />feet/year when placed at 70% relative density (1.5 x 10-2 <br /> <br />cm/sec--medium permeability) (Table 2). We consider a <br /> <br />~ <br /> <br />processed sand of this type should be sufficiently pervious for <br />the filter-drain. The filter system Sho~d~be designed to meet <br />normally used filter criteria for adja{e~ soils and to carry <br />estimated water flows. ~~ <br />The shear strength assigned to f'h.!,s material are <br />given in Table 2. <br /> <br />~ <br /> <br />t <br /> <br />5. Foundation Sands <br /> <br /> <br />Numerous NX drill holes 'ave ~en drilled by the Bureau <br />along the proposed dam axis as ~n~the Geologic Profile, <br />Figure 2 (Bureau's unn~dr~). Based on the data from <br />several NX drill holes ~~;,ost-recent Denison sample hole <br />DD-30A, we classified the ~eo~an and alluvial soils to be <br />encountered bet~~l~ base~f>the dam and the Pierre <br />II L v <br />-- - - - - - - - - -rormation -as. ;S'iV a'nds:::(E.M..:P;- wi.th- some-borde-r l:i'n'e- 'silty -s-an-ds- - ' <br />to well grad~6and~M-SW)' Denison samples from hole DD-30A <br />were insp~a~he~eauls laboratories. The results of <br />grada~~l~~~\ty, density and moisture tests were reported <br />in a~~eau Mem07~)dum dated November 3, 1977 (Ref 11). The <br />resul~~~i/y tests on the Denison samples showed rather <br />low density conditions ranging from 83 to 111 pcf and averaging <br /> <br />t <br /> <br />t <br /> <br />t <br /> <br />t <br /> <br />102.0 pcf (dry density) for 8 samples tested. Low density <br /> <br />. <br /> <br />conditions were also indicated in other exploration holes in <br /> <br />- 14 - <br /> <br />. <br /> <br />LIt. <br />... <br />