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-5- <br />• <br />area of the anticipated axis of the dam, with borings located upstream <br />and downstream of the axis in the areas of anticipated maximum height of <br />embankment construction. Four borings were drilled in the proposed <br />reservoir area to evaluate this area as a borrow source. Two additional <br />borings were drilled in an area south of Energy Fuel's office to determine <br />suitability for borrow. <br />The exploratory borings were drilled with a 4-inch diameter, continuous <br />flight power auger. Relatively undisturbed samples were obtained by driv- <br />ing the 2.5-inch diameter sampler into the soils at various locations <br />within the borings. Our engineer was on-site to direct the drilling opera- <br />tions, log the borings, and obtain samples of the typical subsoil layers. <br />Logs of the exploratory borings are presented on Figs. 5 through 7. <br />r1 <br />LJ <br />LABORATORY INVESTIGATION <br />Samples obtained during the field investigaiton were returned to our <br />laboratory for analysis. Tests included visual classification to confirm <br />the field classifications, natural moisture content and dry density, <br />grain size analysis, Atterberg limits, compaction tests, strength tests, <br />and one-dimensional consolidation tests. The results of the laboratory <br />tests are presented on Figs. 11 through 22. <br />SUBSURFACE CONDITIONS <br />The subsurface conditions consisted essentially of a variable layer <br />of surficial clayey soils, underlain at relatively shallow depths by <br />• <br />