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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 />• February 27, 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 <br />RE: Colowyo Coal Company L.P. <br />Permit No. C-1981-019 <br />Technical Revision No. 110 <br />Geotechnical Drilling <br />Dear Mr. Trujillo, <br />RECEIVED <br />MAR A 2011 <br />pivision of & Satoanon, <br />Min►n9 <br />Tri-State Generation and Transmission Association, Inc. (Tri-State), is the parent company to <br />Axial Basin Coal Company, which is the general partner to Colowyo Coal Company L.P. (Colowyo). <br />Therefore, Tri-State received your adequacy letter dated February 27, 2017 and is providing the below <br />response to your adequacy concerns on behalf of Colowyo. The Colowyo Mine operates under Permit <br />No. C-1981-019. <br />The Division has performed a reclamation cost estimate to backfillfour drill holes adjacent <br />to the Wilson Reservoir and State Highway 13. The total value of this estimate is $265.23 <br />(see attached cost estimate). The Division's estimate is consistent with previous cost <br />estimates approved by both the Division and Colowyo. The Division respectfully requests a <br />response from Colowyo with any questions regarding the cost estimate or an acceptance of <br />the Division's estimate. <br />Response: Tri-State and Colowyo have reviewed the reclamation cost estimate prepared by the <br />Division, which proposes an increase in the overall reclamation liability by $265.23, and hereby <br />provide concurrence with the cost estimate as provided. <br />If you should have any additional questions or concerns please feel free to contact Tony <br />Tennyson at (970) 824-1232 or ttennyson ,tristategt.org. <br />DJC:TT:dbr <br />Enclosure <br />AN EQUAL OPPORTUNITY/AFFIRMATIVE ACTION EMPLOYER <br />A Touchstone Energy' Cooperative <br />Sincerely, <br />Chris S. Gilbreath <br />Manager <br />Water, Waste and Mining Compliance <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 />9704124-4411 505-876.2271 970-864-7316 <br />