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• GEOTECHNICAL STABILITY EXHIBIT EXHIBIT U <br />• <br />• <br />All pit mined slopes will be mined to 3H:1 V, and these are the steepest slopes in the site by far. <br />Since those slopes will be cut from original ground, the slope will be very stable. The surface <br />material of these slopes will be topsoil, which will be compacted during placement. These slopes <br />have always been very stable in all gravels and original soils in this area therefore; no detailed <br />stability analysis is presented. There is at least 20' between the permit boundary and any <br />disturbance. <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 slope failure <br />for injuring off site property. <br />Greg Lewicki, P.E. <br />LaSalle Pit, April 09 <br />U-1