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. EXHIBIT M - GEOTECHNICAL STABILITY <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:1.OV is an angle of 18.4 degrees; therefore, the factor of safety <br />is tan(40)/tan(18.4) or 2.52. <br />I, Greg Lewicki, P.E., with over 20 years of experience in mine slope safety analysis in Colorado, state <br />that this is true. <br />• <br />Greg Lewicki, P.E. <br />ye?/_/ o <br />0 Soderquist Pit March 10 23