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<br /> <br />The structures to the south of the permit area will not be affected since the pit will be excavated at a <br />i 2.OH:l.OV grade and there is considerable horizontal distance between the edge of the railroad tracks <br />and the top of cut slope for the mining operation. This distance is expected to be no less than 70 feet. <br />A demonstration of the slope stability of a 2.OH: ].OV slope in a cohesionless gravel is given below: <br />Cylindrical failure occurs when the cohesive and angular frictional forces of the material are not <br />strong enough to withstand the gravity component. The most common failure of this type is circular <br />or cylindrical in nature as shown in the sketch below. This type of failure is possible in many types of <br />materials, especially those that have steep slopes and poor strength characteristics, which are <br />compounded by wet conditions. <br />• <br />Typical Cylindrical Failure <br /> <br />Cazol Ann Permit CDMG Application 7 6 <br />