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Mr. RabertJ. Slav/ing P.F. <br />Auqurt 8, 2003 <br />Page 2 <br /> <br />The embankments have been constructed from spoil material produced during mining. This <br />material was placed in controlled lifts and compacted. Based on this fact, observations of the on- <br />site spoil piles, and typical strength values for spoil material, the following strength properties were <br />assigned to the embankment. <br />Spoil: c~ = 38°, cohesion = 0 psi <br />Unit Weight: 120 pcf <br />Conclusions and Recommendations <br />Based on the above stated assumptions, safety factor of 1.56 was calculated by the limit <br />equilibrium analysis. Rule 4.05.9(8)(b) states that the stockponds require a safety factor of 1.3. <br />Therefore, these structures should perform adequately during the life of mine. In addition, there <br />are no downstream hazards of these stock ponds; therefore, if a failure did occur, there is minimal <br />risk to life and property. <br />We appreciate this opportunity to work once again with SCC. Please contact the undersigned if <br />you have any questions about this report. <br />Sincerely, <br />MWH <br />• <br />J n Pellicer, P.E. <br />Senior Engineer <br />1Fn2 <br />mas Leidich, P.E. <br />S pervising Engineer <br />Attachments <br /> <br />cc: Jay James <br />U":IGP/.1emm If.Y'ISVk IMd.I'rnMGj Am}n~ <br />eln/al,~. <br /> <br />