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GoodMiller #2 Stability Review <br />Page 2 of 2 <br />March 3, 2015 <br />1. Please update the stability analysis to include surcharge loads from structures, roads, <br />stockpiles and any other appropriate loads as needed. <br />2. Please provide atypical soil profile to be used for the stability analysis. <br />3. Please provide the Division with the slope stability monitoring plan to be used during mining <br />and reclamation activities at the site. <br />4. The Applicant used an internal friction angle of 34 degree for GC classified material. Figure <br />1— Material Properties for Slope Stability from Huang indicates a friction angle of 31 <br />degrees for GC classified material. <br />The Division verified the Applicant's stability analysis models using Clover Technology's Galena <br />v6.1 slope stability software following the Applicant's response to this letter. Copies of the <br />mining and reclamation slope models are attached. <br />The stability analysis for the proposed mining slope was based on generalized conditions <br />and produced a factor of safety less than 1.3. Since the factor of safety was less than 1.3, <br />the Division will require the Applicant to obtain structure agreements for all property, <br />including easement holders, and structure owners within two hundred feet of the affected <br />land. Alternatively, the Applicant may revise the model perimeters to increase the factor of <br />safety to 1.3 or greater. <br />If you have any questions, please contact me at (303) 866 -3567 Ext. 8124. <br />Sincerel <br />Peter S. Hays <br />Environmental Protection Specialist <br />Cc: Tom Kaldenbach, Division of Reclamation, Mining & Safety <br />