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!COLORADO <br />Division of Reclamation, <br />Mining and Safety <br />Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />September 26, 2014 <br />Chris Gilbreath <br />Tri-State Generation and Transmission Association, Inc. <br />P.O. Box 33695 <br />Denver, CO 80233 -0695 <br />Re: New Horizon North Mine (Permit No. C- 2010 -089), TR -06, second adequacy letter <br />Dear Mr. Gilbreath: <br />We received your responses to our first adequacy letter for TR -06 on September 22, 2014. There are still <br />some items to be addressed before the Division can approve this revision. <br />The ditch designs need to be specific. Please break each ditch into segments (as appropriate based <br />on slope or other factors) and give us specific design parameters, namely bottom width and lining <br />material. <br />It is unclear where the flows for the ditch designs originate. Please describe this in the submittal. <br />If you have any questions, please contact me at 303.866.3567 (extension 8113) or Rob.Zuber @state.co.us. <br />Sincerely, <br />7 f <br />Robert Zuber, P.E. <br />Environmental Protection Specialist <br />/oF cow <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. Hickentooper, Governor I Mike King, Executive Director I Virginia Brannon, Director <br />