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G EOTECHNICAL STABILITY EXHIBIT EXHIBIT eeteekitieal <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 overall slope of 3H:1 V is an angle of 18.4 degrees; <br />therefore, the factor of safety is 40/18.4 or 2.17. <br />I, Greg Lewicki, P.E., with over 20 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 />Greg Lewicki, P.E. <br />Korinek 41 Pit August 09 U -1 <br />