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August 7, 2015 <br />Chris Gilbreath <br />Tri-State Generation and Transmission Association, Inc. <br />P.O. Box 33695 <br />Denver, CO 80233-0695 <br />Re: Colowyo Mine (Permit No. C-1981-019), PR -04, additional adequacy items <br />Dear Mr. Gilbreath: <br />This is the Division's second adequacy letter for PR -04; on July 9"' we sent another letter with comments <br />independent of those in this letter. The following items need to be addressed before the Division can approve <br />this revision. The Division will be sending a third preliminary adequacy letter, likely before September 1, <br />2015. <br />Volume 1 <br />ITEM 43. In 2.03.4, Identification of Interests, please add the exact dates (not just years) when individuals <br />became officers. Also, please confirm that these dates are correct. Different sources of this information <br />appear to conflict. <br />Volume 12 <br />ITEM 44 . Section 4.15.8, Revegetation Success Criteria, states that, "Consideration will be given to a <br />revised species diversity standard in the context of a comprehensive revegetation plan revision to be <br />submitted by Colowyo Mine, following approval of PR -02." PR -02 was approved on May 4, 2007. TR - <br />72, Revised Reclamation Plan, was approved March 14, 2008. The text needs to be updated. If TR -72 <br />revised the species diversity standard, Section 4.15.8 needs to reflect the changes or reference the <br />location in the permit where the revised standard is found. <br />Volume 15 <br />Rule 4 <br />ITEM 45. On page 5, in the paragraph beginning with "The ongoing mining activities," more discussion <br />is needed regarding the worst-case condition; please revise the text and (using modeling results, if <br />necessary) explain why the worst-case condition is at the time stated ("when the temporary spoil pile is <br />n 0 <br />1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 http://mining.state.co.us " <br />John W. Hickenlooper, Governor Mike King, Executive Director Virginia Brannon, Director`a,, ri <br />