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<br />DEC 2 7 2006 <br />Geotechnical Stability Exhibit Division of Reclamation, <br />Mining and Safety <br />There are no buildings or structures outside the permit area which could be affected by the <br />operation. All final slopes in reclamation, as shown on Map F, show that 3H:1 V will be the <br />minimum slope. The existing gravel material has few fines and the material does not get its <br />strength from cohesion, but internal angle of friction. Partly rounded gravel of this type in place <br />has an angle of repose of approximately 40 degrees. For non-cohesive soils, this is also the <br />internal angle of friction of the material. The final overall slope of 3.OH:1.OV is an angle of 18.4 <br />degrees; therefore, the factor of 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 <br />Colorado, state that this is true and that this factor of safety is adequate to prevent failure of the <br />slopes. <br />White River City Pit December 06 U-1 <br />