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GEOTECIINICAL STABILITY EXIIIBIT <br />There are no buildings or any structures outside the permit azea which could be affected by [he <br />operation. The final slopes of the pit reclamation, as shown on Maps E-2 and E-3, show that <br />3H:1 V will be the minimum slope. The existing gravel material has few fines and the material <br />does not get its strength from cohesion, but internal angle of friction. Partly rounded gravel of this <br />type in place has an angle of repose of approximately 40 degrees. For non-cohesive soils, this is <br />also the internal angle of friction of the material. The overall slope of 3.OH:1.OV is an angle of <br />18.4 degrees, therefore, the factor of safety is 40/18.4 or 2.17. <br />I, Greg Lewicki, P.E., with over 20 yeazs of experience in mine slope safety analysis in Colorado, <br />state that this is [rue and that this factor of safety is adequate to prevent failure of the reclaimed <br />slopes. <br />Haldorson Sand and Gravel Mine 66 <br />