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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 7, 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. 129 <br />Adequacy Response <br />Dear Mr. Trujillo, <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). Tri-State received your adequacy letter dated December 31, 2018 and is <br />providing the response below to your adequacy concern on behalf of Colowyo. The Colowyo <br />Mine operates under Permit No. C-1981-019. <br />1. For the Division's review, please provide an updated Fill Survey Monument Report and <br />Graphs to include up to the 2018 Fourth Quarter. These reports and graphs are normally <br />provided with Colowyo's Annual Reclamation Report under Figures 3-2 and 3-3. <br />Response: The West Pit Fill Survey Monument Graphs included under the TR -129 <br />application, already include the fourth quarter 2018 data. The graphed data for the fourth <br />quarter survey (11/8/2018) is graphed just passed the 11/1/2018 line on the horizontal <br />axis. <br />2. In the provided document, the West Pit Fill Final Construction Report, it states that the <br />design, instrumentation, and monitoring requirements for the West Pit Fill are discussed <br />under Volume 5B, Exhibit 19, and Section IIB. This appears to be a typo since this <br />reference is for the Section 16 Fill and the West Pit Fill is discussed under Volume 5B, <br />Exhibit 19, and Section IB. Please provide an updated West Pit Fill Final Construction <br />Report with the correct reference. <br />Response: The citation that was noted to be incorrect has been revised and a new West <br />Pit Fill Final Construction Report (cover page only) has been provided. <br />3. After reviewing the provided Change Sheet for TR -129, there are notes for revised <br />Volume 5B, pages I a-1 through I a-4 however these revised pages were not included <br />with the TR -129 application. Please provide the proposed Volume 5B, pages I a-1 <br />through I a-4. <br />AN EQUAL OPPORTUNITY/AFFIRM477VEACTION EMPLOYER CRAIG STATION ESCALANTE STATION NUCLA STATION <br />P.O. BOX 1307 P.O. BOX 577 P.O. BOX 696 <br />A Touchstone Energy' Cooperativet CRAX:, CO 67626.7307 PREWITT, NM 87046 NUCIA, CO 01424.0696 <br />K� 970.824.4411 505.8767271 970.664-7316 <br />