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<br />1 <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />1 <br /> <br /> <br />Flattened Slope <br />Tailing Pond No.• • <br />Sunnyside Mine-Silverton, Colorado <br />WT No. 31210019 <br />material strengths previously discussed in the original report <br />and the location of the phreatic surface in the pond were <br />conducted for both static and psuedo-static cases. The <br />following table presents the results of the stability analyses: <br />Proposed Configuration 20 feet fill <br />Static Pseudo-Static <br />Analysis Aitalvsis <br />2.5:1 Slope Section 3 1.54 1.20 <br />2.5:1 Slope Section 5 1.89 1.47 <br />A minimum factor of safety of at least 1.5 is generally the <br />minimum assigned to man-made slopes analyzed under static <br />conditions. A minimum factor of safety of 1.0 is typically <br />used under psuedo-static conditions. <br />The minimum factors of safety for both static and psuedo-static <br />cases can be met when constructing the 2.5:1 slopes planned for <br />the reclamation process. <br />If you have any questions concerning this analysis, please <br />contact us. <br />' Sincerely, <br />WESTERN TECHNOLOGIES INC. <br />~ ~~` / <br />Lawrence E. Cynova, P.E. <br />/mja 2-/3--q~~~:. <br /> <br /> <br />1 <br />-2- <br /> <br />