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Memo to Jared Ebert 3 January 8, 2010 <br />Slope Stability Review File No. M-2009-082 <br />Phase 4B <br />The applicant's analysis was duplicated for verification; no potential failure surfaces with lower safety <br />factors than the applicant's identified critical slip circle were located. The safety factor produced by <br />Galena is higher than that produced by Slopeft this is due to slight programming differences in the <br />software packages and is not significant. Therefore, the accuracy of the applicant's analysis is confirmed <br />(see attached). <br />Phase 4C <br />9. Please explain the difference in piezometric surface elevation between the stability analysis for <br />PA04-BH011 used for Phase 4A and 4C. <br />The applicant's analysis was duplicated for verification; no potential failure surfaces with lower safety <br />factors than the applicant's identified critical slip circle were located. The safety factor produced by <br />Galena is higher than that produced by Slope/W; this is due to slight programming differences in the <br />software packages and is not significant. Therefore, the accuracy of the applicant's analysis is confirmed <br />(see attached). <br />Phase 5A <br />The applicant's analysis was duplicated for verification; no potential failure surfaces with lower safety <br />factors than the applicant's identified critical slip circle were located. The safety factor produced by <br />Galena is higher than that produced by Slopeft this is due to slight programming differences in the <br />software packages and is not significant. Therefore, the accuracy of the applicant's analysis is confirmed <br />(see attached). <br />Phase 5B and 5C <br />The applicant's analysis was duplicated for verification; no potential failure surfaces with lower safety <br />factors than the applicant's identified critical slip circle were located. The safety factor produced by <br />Galena is higher than that produced by Slope/W; this is due to slight programming differences in the <br />software packages and is not significant. Therefore, the accuracy of the applicant's analysis is confirmed <br />(see attached). <br />Longterm <br />The applicant's analysis was duplicated for verification; a failure surface with lower safety factor than the <br />applicant's identified critical slip circle was located, however the safety factor was above 1.00 and <br />therefore acceptable to the Division. The accuracy of the applicant's analysis is confirmed (see attached). <br />Conclusion <br />The Division agrees with the proposed setbacks from the mining highwall at the Parsons Mine.