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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 />November 8, 2017 <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 RECEIVED <br />RE: Colowyo Coal Company L.P. NOV 14 2017 <br />Permit No. C-1981-019 <br />Technical Revision No. 114 Division of Reclamation, <br />Adequacy Response Mining & Safety <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). Therefore, Tri-State received your adequacy letter dated November 7, 2017 and <br />is 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. The Division has performed a reclamation cost estimate to reclaim 0.5 acres of <br />disturbance associated of the clean water ditch CWD-5. The total value of this <br />estimate is $584.77 (see attached cost estimate). The Division's estimate is <br />consistent with previous cost estimates approved by both the Division and Colowyo. <br />The Division respectfully requests a response from Colowyo with any questions <br />regarding the cost estimate or an acceptance of the Division's estimate. <br />Response: The Division estimates that there will be 972 LCY of material needed to be <br />available for reclamation of the CWD-5 ditch. Given the configuration of the ditch <br />presented in Exhibit 7, Item 23, Part A and the length provided Exhibit 7-23, Figure A6, <br />the correct amount of material is 222 LCY. Please revise the reclamation cost estimate <br />for TR -114 with this correct amount of material. <br />If you should have any additional questions or concerns please feel free to contact Tony <br />Tennyson at (970) 824-1232 or ttennysonAtristategt.org. <br />Sincerely, <br />Daniel J. Casiraro <br />Senior Manager <br />Environmental Services <br />DJC:TT:der <br />Enclosure <br />AN EQUAL OPPORTUNITY/AFFIRMATIVE ACTION EMPLOYER CRAIG STATION ESCALANTE STATION NUCLA STATION <br />P.O. sox 1W RQ KW W P.O. BW M <br />A Touchstone EnereCoopeerative CRAc% co nQalsm PrAWITr, wM we" NUCL& CO n424.osse <br />WMV44411 sae}sn-aw 9704w-n1s <br />