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GEOTECHNICAL STABILITY EXHIBIT <br />EXHIBIT U <br />There are no buildings or structures outside the permit azea which could be affected by the <br />operation. All final slopes in reclamation, as shown on Map F, show that 2H: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 overall slope of 2.OH:1.OV is an angle of 26.6 <br />degrees, therefore, the factor of safety is (tan 40 deg /tan 26.6 deg) which is 1.68. Much steeper <br />slopes within the pit have been in place for yeazs without any sign of failures. <br />I, Greg Lewicki, P.E., with over 20 yeazs 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 />~~'2 ~Di~ <br />RECEIVED <br />DEC 1 12006 <br />plvisi0n of Reclamation, <br />Mining and Safety <br />Co[ona Pit November 06 U-1 <br />