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A10-M COLORADO <br />AA%VDivision of Reclamation, <br />L Mining and Safety <br />Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />April 8, 2015 <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 8 (TR -8) <br />Adequacy Review No. 2 <br />Dear Mr. Gilbreath: <br />The Colorado Division of Reclamation, Mining and Safety (Division) received your responses to the December <br />26, 2014 adequacy questions on April 3, 2015. The Division finished its review of your responses and has the <br />following questions: <br />1. Item has been resolved. <br />Tri -State responded that the table on Map 2.05.3(3)-3 represents the proposed maximum design, but <br />the maximum design width was not necessary. If Tri -State has determined that a minimum width of <br />40 feet will not be required for all haul roads, please revise the table on Map 2.05.3(3) to reflect the <br />actual minimum width necessary to accommodate traffic at the site. <br />3. Item has been resolved. <br />4. Item has been resolved. <br />5. Item has been resolved. <br />6. The TOC was updated, as requested. The text on page 4 of Section 2.05.3 (3) was revised to direct the <br />reader to Appendix 2.05.3(3) -3. Please also include a reference here to Map 2.05.3(3) -4. <br />7. The Division has a new series of comments regarding Map 2.05.3(3) -4, to which a number of <br />additional changes have been made. Please update the map to address the following comments: <br />a. The base map in the plan view has been updated with what appears to be current topographic <br />data (as opposed to pre- mining topography). This change is extremely helpful. Please identify <br />the various features, i.e. topsoil stockpile, coal handling area (or other name, for the area north <br />of the haul road), and overburden stockpile. <br />pF CC}10 <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 />