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<br />At a slope of 2H:1 V, I = 26.5 degrees. Using an internal angle of friction of 36.0 degrees, this results <br />• in a factor of safety of 1.35, which is adequate. <br />[n my experience collecting samples, conducting laboratory tests and computer analyses of many <br />slopes throughout Colorado, [believe this is a reasonable estimate for the slope safety factor on this <br />site. This is primarily due to the mild slope of 2H:1 V and the high friction angle of the material. The <br />relatively low slope height of approximately 60 feet also lessens the chances of a failure. <br />Moisture in the slope is also an important consideration in a slope stability analysis but only in soils <br />of higher cohesion. Cohesionless soils are not usually adversely affected by changes in moisture <br />content in the soil. Earthquake potential is also minimal in most of Colorado. <br />It is the opinion of Greg Lewicki, P.E., with over l5 years of experience with mine slope stability, <br />that the plans for the Carol Ann Schmidt Pit will result in an extremely stable slope, and there is no <br />threat to any of the structures within the vicinity. <br />• No other types of failure are likely in this material, given the uniform nature of the gravel. <br />• <br />Carol Ann Permit CDMG Application 7 9 <br />