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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 29, 2019 <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. 131 <br />Section 28 Ditch Revision <br />Dear Mr. Trujillo, <br />RECEIVED <br />JAN 31 2019 <br />DIVISION OF RECLAMATION <br />MINING AND 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 131 (TR -131) to Permit No. C-1981-019. <br />TR -131 proposes several changes within the Section 28 watershed, disturbance boundary, <br />and secondary channels for future reclamation areas adjacent to the South Taylor Pit. First, the <br />Section 28 Ditch has been remodeled as an erodible channel to alleviate the issues of the rubber <br />liner tearing due to heavy wildlife usage within the ditch. Second, the disturbance boundary on <br />the southern end of the South Taylor has been reduced by 8.1 acres. Finally, the secondary <br />permanent channels in future reclamation areas adjacent to the South Taylor Pit have been <br />removed. This occurred as slopes and contributing drainages areas to these secondary channels <br />are small enough that the channels to not provide any value for the post -mine land use for those <br />future reclamation areas. The secondary channels that have already been constructed are not <br />proposed to be revised. <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 />AN EQUAL OPPORTUNITY / AFFIRMATIVE ACTION EMPLOYER <br />A Touchstone EnergrCooperative *'I^ <br />Sincerely, <br />Daniel J. Casiraro <br />Senior Manager <br />Environmental Services <br />CRAIG STATION ESCALANTE STATION NULLA STATION <br />P.O. BOX 1307 P.O. BOX S" P.O. BOX 698 <br />CRAIG. CO 61676.1307 PREWRT. MM 87045 NUCLA. CO 81424-0688 <br />970-924dt11 505-876.2271 970.0667316 <br />