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1. Slope Stability Analysis <br /> The material used in the analysis are sand and gravel, mixed grain size for the aggregate deposit. <br /> The material properties are outlined in the table below. They are from the SME Mining <br /> Reference Handbook(2002 edition)'. <br /> Table 1 —Material Properties <br /> Aggregate <br /> Description sand and gravel,mixed <br /> grain size <br /> Unit Weight(Ibs/ft3) 110 <br /> Friction angle(0) 45 <br /> Cohesion 0 <br /> 1.1 Reclaimed Slope <br /> The reclaimed slope consists of sand and gravel as described above that has been topsoiled and <br /> revegetated according to the reclamation plan. Analysis of the stability of said slope involves <br /> building a model of the slope in GALENA slope stability software and conducting a search for <br /> the failure circle using Bishop's method of slices. In conditions such as those found at Carol <br /> Ann, a circular failure slope is the most likely. Slope stability is governed by the physical <br /> properties of the material as described in Table 1. <br /> Multiple failure circles were generated by GALENA to determine the lowest Factor of Safety <br /> (FS). The results of the software iterations can be seen attached to this letter along with a slope <br /> layout(Figure 2). <br /> 2. Conclusion <br /> The failure slope with a FS = 3.25 will be completely contained within the property, and the FS <br /> is significantly higher than the minimum of 1.5 required for permanent slopes of this type. <br /> Ben Langenfeld, P.E. <br /> F <br /> 0047151�i <br /> CO License#0047151 <br /> ' Table 2.5; Originally from Houk and Bray, 1977 <br /> Orchard Grove Slope Stability 2 f;ny ,w^»i,6 anA 1s<u•uirr(,s., <br />