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U <br />TRI -STATE GENERATION AND TRANSMISSION ASSOCIATION, INC. <br />HEADQUARTERS: PO. BOX 33695 DENVER, COLORADO 80233 -0695 303 - 452 -6111 <br />January 28, 2015 <br />Mr. Rob Zuber <br />RECEIVED <br />Environmental Protection Specialist <br />Colorado Division of Reclamation, Mining & Safety <br />JAN 3 0 2015 <br />Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Division of Reclamation, <br />Denver, CO 80203 <br />Mining & Safety <br />RE: Colowyo Coal Company L.P., Permit No. C- 1981 -019, <br />Technical Revision No. 104 <br />(TR -104), East Taylor Ditch Modification, Technical <br />Adequacy Response <br />Dear Mr. Zuber: <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 this adequacy response <br />for TR -104 to Permit No. C- 1981 -019. Tri-State received your adequacy comments, dated <br />December 17, 2014, and the following responses have been provided to your concerns: <br />1. No further action required. <br />2. No further action required. <br />3. Please address the following: <br />a. On page Exh. 7- 141 -2, the reference to 53 cfs in the SEDCAD run appears to be a <br />mistake. <br />Response: Text has been modified to reflect the approximately 47 cfs found in the SEDCAD <br />run. <br />b. The 1.5% slope for the middle reach in the SEDCAD model appears low, based on <br />the topography map. <br />Response: The slope used to model this reach has been increased to 2.0% to more closely <br />reflect current conditions on the ground. A revised SEDCAD model reflecting this change has <br />been included in this package. <br />c. The text on page Exh. 7 -141 -3 references two SEDCAD models. Please add another <br />sentence (or a parenthetical phrase) to tell the reader that one of'the runs is not <br />included in the exhibit and explain why. <br />Response: Colowyo has modified the text to clarify the purpose of Exhibit 7 -14I, Figure 2. <br />CRAIG STATION ESCALANTE STATION NUCLA STATION <br />P.O. BOX 1307 P.O. BOX 577 P.O. BOX 698 <br />CRAIG, CO 81626 -1307 PREWITT, NM 87045 NUCLA, CO 81424 -0698 <br />970- 824 -4411 505 - 972 -5200 970 -864 -7316 <br />