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TRI-STATE GENERATION AND TRANSMISSION ASSOCIATION, INC. <br />HEADQUARTERS: P.O. BOX 33695 DENVER, COLORADO 80233-0695 303-452-6111 <br />January 23, 2017 <br />Mr. Brock Bowles <br />Environmental Protection Specialist <br />Colorado Division of Reclamation, Mining and Safety <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 RECEIVED <br />RE: New Horizon Mine (Permit No. C-1981-008) JAN 2 5 2017 <br />Technical Revision No. 77 (TR -77) <br />Surface and Groundwater Monitoring Plan Division of Reclamation, <br />Mining 8 Safety <br />Dear Mr. Bowles: <br />Tri-State is the parent company of Elk Ridge Mining and Reclamation, LLC (Elk Ridge). Elk <br />Ridge operates the New Horizon Mine under the Colorado Division of Reclamation, Mining and Safety <br />Permit No. C-1981-008. Therefore, Tri-State is submitting technical revision 77 (TR -77) on behalf of Elk <br />Ridge. <br />TR -77 proposes changes to the surface and groundwater monitoring plan including the <br />parameters that will be sampled. The parameters selected for TR -77 were obtained from Tables I and 2 <br />of the "Colorado Mined Land Reclamation Division Coal Section, Guidelines for the Collection of <br />Baseline Water Quality and Overburden Geochemistry Data". Finally, Section 2.04.7 and 2.05.6(3) have <br />been updated with general updates and reformatted to be compatible with current Microsoft software. <br />Also enclosed please find a revision application and a change of index sheet to ease incorporation <br />of these materials in to the permit. If you have any questions about the enclosed technical revision, please <br />contact Tony Tennyson at (970) 824-1232 or ttennyson@tristategt.org. <br />DJC:TT:dbr <br />Enclosures <br />cc: Frank Ferris (via email) <br />Chris Gilbreath (via email) <br />Jason Storey (via email) <br />Tony Tennyson (via email) <br />File: G474 -11.3(21)b-4 <br />AN EQUAL OPPORTUNITY/AFFIRMATIVE ACTION EMPLOYER <br />A Touchstone EnerWCooperative ?01_)S <br />Sincerely, <br />Daniel J. Cas' <br />Senior Manager <br />Environmental Services <br />CRAIG STATION ESCALANTE STATION NUCLA STATION <br />P.O. BOX 1307 P.O. BOX 577 P.O. BOX 698 <br />CRAIG, CO 81626-1307 PREWITT, NM 87045 NUCLA, CO 81424.0698 <br />970-824-4411 505-876-2271 9704WA-7316 <br />