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<br />o <br /><.I:") <br />.... <br /> <br />In conclusion, it is believed that the only adverse geo- <br /> <br />logical consideration to the construction of the proposed dam <br /> <br />and reservoir is the excessive depth of foundation overburdens. <br /> <br />There is reason to expect that this difficulty can be overcome <br /> <br />without requiring expensive cutoff excavation to bedrock. No <br /> <br />excessive need for bedrock grouting is anticipated. Although <br /> <br />the sandstone beds are jointed the intervening shales will <br /> <br />provide natural barriers to bedrock percolation. <br /> <br />Earth embankment is available from several alternative <br /> <br />sources near the dam. The side ~~sh deposits both up and dovm- <br /> <br />stream fram the site can be utilized with a haul of less than <br /> <br />one mile. Gravel is available in the Colorado river valley with <br /> <br />a haul of less than eight miles, but no precise choice has yet <br /> <br />been made. Sandstone for riprap can be quarried locally. <br /> <br />In all, 11 diamond drill holes totalling 1282 feet and 7 <br /> <br />test pits (132 ft.) were completed in exploring the geological <br /> <br />and construction features. Attention was given to two alter- <br /> <br />native axis, the upper of which was finally selected. Six <br /> <br />additional pits, totalling 41 feet, were dug in searching for <br /> <br />embankment materials. <br /> <br />64 <br />