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-17- <br />• <br />• <br /> <br />tests and a review of various published data regarding the strength <br />characteristics of rock fills. In our opinion, the fill will func- <br />lion essentially as a granular type medium. Based on the observa- <br />lions of the existing materials, we believe that the design should <br />use an angle of internal friction of 37 degrees. No cohesion should <br />be assumed to occur in the fill. We believe the fill, if properly <br />compacted, will exhibit some cohesion characteristics and will <br />have a friction characteristics higher than the assumed value of <br />37 degrees which corresponds to observed values of loose, dumped <br />spoil at the Energy Fuels site. <br />Draina¢e Conditions <br />The performance of any fill, or natural slope, is highly in- <br />fluenced by the location of any phreatic surface within the fill. <br />Diversion of surface drainage around the fill will substantially <br />reduce the risk of saturation. Additionally, provision of drains <br />within the fill reduces the risk of saturation developing. If the <br />natural drainages are diverted at the surface around the fill, then <br />the only method of saturation would be the precipitation on the <br />fill surface. Most of the precipitation in this area occurs in <br />the form of snow during the winter months and would probably infil- <br />trate the fill during each spring runoff period. The permeability <br />of the fill is relatively high. The amount of moisture required <br />to saturate the fill is considerable, considering the probable <br />volume of voids within the fill. We do not believe a water table <br />