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(COLORADO <br />Division of Reclamation, <br />Mining and Safety <br />1 Department of Natutai Resource; <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />June 6, 2016 <br />Chris Gilbreath <br />Tri-State Generation and Transmission Association <br />12050 North Pecos St. Suite 100 <br />Westminster, CO 80234 <br />Re: New Horizon North Mine (Permit No. C-2010-089) <br />Technical Revision 13 (TR -13) <br />Adequacy Review <br />Dear Mr. Gilbreath: <br />The Colorado Division of Reclamation, Mining and Safety (Division) received your application for TR -13 for <br />the New Horizon North Mine on May 2, 2016. The application was deemed complete on May 6, 2016. TR -13 <br />is proposing to revise the ditch design of the upper segment of the NHN-001 East Ditch. <br />The Division finished its review of the TR -13 application and has the following question and comment: <br />1. Based on the Division's review of the approved and proposed information pertaining to the Pond NHN- <br />001 East Ditch, the information is not adequate. Although the proposed NHN-001 East Ditch extension <br />provides a design from ditch station 4+88 to 10+79, clarification is requested for ditch segment 0+00 to <br />4+88. The currently approved east ditch as -built designs are noted for segments 27+11 to 0+00 with a <br />cumulative peak flow provided. Proposed Page 3 of Section 2.05.3(4) states that Appendix 2.05.3(4)-1 <br />contains ditch design information for the NHN-001 East Ditch from station 0+00 to 4+88 as shown on <br />Map 2.05.3(4)-11. However, Appendix 2.05.3(4)-1 only includes a "typical" ditch design for the east <br />ditch prior to construction and the submitted as -built design identified in appendix 2.05.3(4)-7. In <br />addition, proposed page 3 of proposed appendix 2.05.3(4)-11 states the new stationing, starting at 0+00 <br />to 10+79 represents the area not previously described in Section 2.05.3(4). Also, the proposed Map <br />2.05.3(4)11 identifies station 0+00 to 4+88 as "existing ditch." <br />Based on the above information, the Division believes that the design criteria required under Rule <br />4.05.3 for the east ditch is inadequate for the entire east ditch existing or proposed. Please provide <br />information concerning the design of the the NHN-001 east ditch from station 0+00 to 4+88, or provide <br />justification as to the omission of the design criteria for this segment of the east ditch for review by the <br />Division. <br />If you have any questions or need additional information, please contact me at (303) 866-3567 ext. 8142. <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 />uF-Q)z0,P <br />y� b i o <br />4N »; <br />