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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 />December 11, 2015 <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 <br />RE: New Horizon North Mine <br />Permit No. C-2010-089 <br />DEC ' 2015 <br />Technical Revision No. 12 <br />Overburden Blasting Standards Revision <br />Divislon of Reclamation, <br />Mining &Safety <br />Dear Mr. Bowles: <br />Tri-State Generation and Transmission Association, Inc. (Tri-State) is the parent <br />company to Western Fuels -Colorado, A Limited Liability Company (Western Fuels -Colorado) <br />New Horizon North Mine. The New Horizon North Mine operates under Division of <br />Reclamation, Mining and Safety (DRMS) Permit No. C-2010-089. Therefore, Tri-State on <br />behalf of the New Horizon North Mine is submitting technical revision 12 (TR -12) to Permit No. <br />C-2010-089. TR -12 proposes revisions to Section 2.05.3(6)(a) — Overburden Blasting, and <br />presents a new Section 4.08 to the permit to address blasting performance standards. <br />Also included in this revision application is a change of index sheet to ease incorporation <br />into the permit document, a revision application, and public notice for your approval. If you <br />should have any additional questions or concerns, please feel free to contact Tony Tennyson at <br />(970) 824-1232 at your convenience. <br />Sincerely, <br />Daniel J.asiraro <br />Senior Manager <br />Environmental Services <br />DJC:TT:pvt <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)c-4 <br />AN EQUAL OPPORTUNITY /AFFIRMATIVE ACTION EMPLOYER CRAIG STATION ESCALANTE STATION NUCLA STATION <br />P.O. BOX 1307 P.O. BOX 577 P.O. BOX 698 <br />A Touchstone Energy` Cooperative ` ' CRAIG, CO 81626-1307 PREWRT, NM 87045 NUcu, CO 81424-0696 <br />�. _ 970-824-4411 505-972-5200 9704864-7316 <br />