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GEOTECHNICAL STABILITY EXHIBIT <br />There are no buildings or any structures outside the permit area which could be affected by the <br />operation. The final slopes of the pit lake reclamation, as shown on Map E-3, show that 3H:1V will <br />be the maximum slope, which does not need a slope stability analysis due to the slope angle and the <br />non-cohesive nature of the gravel. The lake is fully incised into the existing terrain; no dam is <br />located on the site. The existing gravel material has few fines and the material does not get its <br />strength from cohesion, but intemal angle of friction. Partly rounded gravel of this type in place has <br />an angle of repose of approximately 40 degrees. In situ material generally has an angle of repose of <br />approximately 55 degrees. For non-cohesive soils, this is also the internal angle of friction of the <br />material. The overall slope of 3.OH:1.OV is an angle of 18.4 degrees, therefore, the factor of safety <br />is 40(18.3 or 2.18. <br />I, Greg l.ewicki, P.E., with over 20 years of experience in mine slope safety analysis in Colorado, <br />state that this is true and that this factor of safety is adequate to prevent failure of the lake slopes. <br />19 Road Pit 10102 32 <br />