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<br />_ Flattened Slope <br />Tailing Pond No.• <br />Sunnyside Mine-Silverton, Colorado <br />WT No. 31210019 <br />• <br />material strengths previously discussed in the original report <br />1 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 />Provosed Configuration 20 feet fill <br />Static Pseuilo-Static <br />Analy~Sis Analysis <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 /> CHNOLOGIES INC. <br />W <br />E <br />STERN TE <br /> / <br />E <br />f <br /> <br /> Lawrence E. Cynova, P.E. <br /> ? -~3-ql~ <br /> /mja <br /> <br /> <br /> <br />-2- <br /> <br />