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Geotechnical Stability Exhibit <br />Exhibit U <br />There are no buildings or structures outside the permit area which could be affected by the operation. <br />All final slopes in reclamation, as shown on Map F, show that 3H:1 V will be the minimum slope. The <br />existing gravel material has few fines and the material does not get its strength from cohesion, but <br />internal angle of friction. Partly rounded gravel of this type in place has an angle of repose of <br />approximately 40 degrees. For non-cohesive soils, this is also the internal angle of friction of the <br />material. The final overall slope of 3.OH: LOV is an angle of 18.4 degrees; therefore, the factor of <br />safety is 40/18.4 or 2.17. <br />I, Greg Lewicki, P.E., with over 26 years of experience in mine slope safety analysis in Colorado, state <br />that this is true and that this factor of safety is adequate to prevent failure of the slopes. <br />E <br />.r .1 <br />61 L4'( <br />gI,6IoK <br /> <br /> <br />White River City Pit, August 08 U-1