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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 />March 19, 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. 116 <br />Adequacy Reponses <br />Dear Mr. Trujillo, <br />RECEIVED <br />MAR 212018 <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). Tri-State received your adequacy letter dated March 13, 2018 and is providing <br />the response below to your adequacy concern on behalf of Colowyo. The Colowyo Mine <br />operates under Permit No. C-1981-019. <br />On proposed page Volume 15, Rule 2, page 73, the first paragraph references Exhibit 23, <br />Item 7, Part N. This exhibit doesn't currently exist, was not provided with TR -118 and is <br />assumed to be an error. Please correct the reference on proposed page Volume 15, Rule <br />2, page 73. <br />Response: The citation as noted by the Division contained a typographically error. This <br />has been corrected. <br />2. In proposed Exhibit 7, Item 23, Part B, page 1, paragraph 2, it states "Riprap sizes are <br />defined by the SEDCAD mode, as described in more detail the Introductory Text of <br />Volume 2D in the document entitled `Methodologies and Assumptions for Sedimentation <br />Pond Design Evaluations "'. When reviewing "Methodologies and Assumptions for <br />Sedimentation Pond Design Evaluations ", there are no discussions in regards to riprap <br />sizing outside of Table 9. However, Table 9 only refers you to Volume 2C, Exhibit 7, Item <br />4 in which there is also no discussion regarding riprap sizing. Please update and correct <br />the original reference to include the section that discusses the applicable riprap sizing. <br />Response: The citation to `Methodologies and Assumptions for Sedimentation Pond <br />Design Evaluations' in Volume 2D has been removed. Riprap sizes are defined by <br />SEDCAD and can be found in any applicable SEDCAD model found in the permit <br />application package. <br />AN EOUAL OPPORTUM"1 AFFIRMAT1YEACTION EMPLOYER CRAIG STATION ESCALANTE STATION NUM STATION <br />P.O. BOX 1307 P.O. BOX 577 P.O. BOX 6" <br />A Touchstone Energy'Cooperadve CRAIG. CO 81626.1307 PREWT T, NM 67065 NuaA, CO H@ 636 <br />I-0 <br />} 970-921.4411 505 876.2271 970 -BG -7316 <br />