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<br />Woodward.CIyde Consultants <br /> <br />- ~ (' , <br />I:" '\ <br />v.;.,;v..... <br /> <br />observed that the Bureau's reports (Ref. 5, 13) indicate that <br />the materials can be clayey sands (SC), lean clays (CL) and fat <br />clays (CH), most of these having little or no gravel. <br /> <br />~ <br /> <br />Our review of laboratory permeability data contained in <br /> <br />Report EM-221 (Ref. 5) indicate that the average permeability <br /> <br />value from tests conducted in the Denver and Project <br />Laboratories was in the order of 0.1 feet/year (1 x 10-7 <br /> <br />cm/sec--impermeable). The above tests were on composited <br /> <br />samples representing an average excavation depth of 10.5 feet. <br /> <br />We consider this data to be reasonably representative of the <br /> <br />average permeability of these borrow materials presently being <br /> <br />considered for core material. <br /> <br />The shear strength parameters which we conservatively <br /> <br />estimated for the entire range of materials that will probably <br /> <br />be placed in Zone 1 are given in Table 2. <br /> <br />t <br /> <br />3. Zone 2 <br /> <br />The outer shell zone, Zone 2, materials were designated to <br /> <br />be obtained from Borrow Areas X, X-Wand X-SW located in or <br /> <br />near the valley floor of the reservoir area. In the Bureau's <br /> <br />Table of Stability Parameters the materials were designated <br /> <br />Zone 2 sand and gravel and were classified as a silty sand (SM) <br /> <br />with 85% sand and 15% non-plastic fines. The SM classification <br /> <br />agrees with the data presented in EM-221 (Ref. 5). We noted <br /> <br />some poorly graded sand (SP) on recent log of test pit TP-X-l. <br /> <br />- 12 - <br /> <br />., <br />