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,~ <br />C <br />GEOTECHNICAL STABILITY EXHIBIT <br />• <br /> <br />• <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 Detail B, show that 2H:1 V will <br />be the primary slope, although a 10' wide section at water level will have a slope of SH:1 V, which is <br />to serve as the wetland shelf. The lake is fully incised into the existing terrain; no dam is located on <br />the site. The existing gravel raterial has few fines and the material does not get its strength from <br />cohesion, but internal angle of friction. Partly rounded gravel of this type in place has an angle of <br />repose of approximately 40 degrees. For non-cohesive soils, this is also the intemal angle of friction <br />of the material. The overall slope of 2.OH:1.OV is an angle of 30 degrees, therefore, the factor of <br />safety is 40/30 or 1.33. <br />I, Greg Lewicki, 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 />Piceance Pil 7/01 <br />33 <br />