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Susan Burgmaier -2- April 7, 2014 <br />friction angles of 30 and 32 degrees The FoS derived in HBET's analyses are <br />above 1.5, but not excessively so. Given that we have very little hard data <br />available regarding the true value(s) for angle of internal friction for compacted <br />coal mine waste, I believe that incorporating a similar sensitivity analysis into the <br />current evaluation would be appropriate. <br />BOW: A sensitivity analyses was conducted and is discussed in Section 3.5 <br />Discussion - Gob Pile #2. Please see the revised HBET stability analysis dated April <br />4, 2014. <br />Please fee free to contact me if you have any questions. <br />Sincerely, <br />VAV� 44 ,- <br />Tamme Bishop, P.E. <br />Project Engineer <br />Enclnsurp--;- <br />Volume IX: Page 19, Table of Contents <br />HBET Stability Analysis dated April 4, 2014 <br />CC: Marcia Talvitie, DRMS - Durango (electronically) <br />Bill Bear, Bowie Resources, LLC (electronically) <br />Paonia Public Library <br />Bureau of Land Management (electronically) <br />US Forest Service (electronically) <br />