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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 3, 2018 <br />Mr. Zach Trujillo <br />Environmental Protection Specialist <br />Colorado Division of Reclamation, Mining & Safety <br />Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />RE: Colowyo Coal Company L.P. <br />Permit No. C-1981-019 <br />Technical Revision No. 129 <br />West Pit Fill <br />Dear Mr. Trujillo, <br />RECEIVED <br />DEC 13 2018 <br />Division of Reclamation, <br />Mining & Safety <br />Tri-State Generation and Transmission Association Inc. (Tri-State), is the parent <br />company to Axial Basin Coal Company, which is the general partner to Colowyo Coal Company <br />L.P. (Colowyo). Therefore, Tri-State on behalf of Colowyo is submitting three (3) copies of <br />technical revision 129 (TR -129) to Permit No. C-1981-019. <br />TR -129 proposes to relinquish the quarterly monitoring requirements for the West Pit <br />Fill. A large portion of the West Pit Fill has been Phase III released, and under the final decision <br />issued for SL -14 the remaining portions of the West Pit Fill that have not been Phase III released <br />were Phase II released. Colowyo is considering the West Pit Fill construction complete, and <br />included herein is the final construction report for the West Pit Fill. Please note that this report is <br />not being submitted to become part of the permit application package, but is intended to be part <br />of the public record to document that the fill construction is complete and stable. <br />Included in this technical revision are a revision application, a proposed public notice, <br />and a change of index sheet to ease incorporation of this technical revision into the permit <br />document. If you should have any additional questions or concerns, please feel free to contact <br />Tony Tennyson at (970) 824-1232 at your convenience. <br />DJC:TT:der <br />Enclosure <br />AN EQUAL OPPORTUNITY/ AFFIRMATIVE ACTION EMPLOYER <br />A Touchstone Energy'Cooperative 0 <br />Sincerely, <br />Daniel J. Casi aro <br />Senior Manager <br />Environmental Services <br />CRAIG STATION ESCALANTE STATION NUCLA STATION <br />P.O. BOX 1307 P.O. BOX 577 P.O. BOK 698 <br />CRAIG, CO 01676.1307 PREWRT, NIA 87015 NULLA, CO 81020 -OSB <br />970-821-4411 SOS -876.2271 970-861-7316 <br />