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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 13, 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 />RECEIVE <br />ve 16 2017 <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). Therefore, Tri-State on behalf of Colowyo is submitting three (3) copies of <br />technical revision 110 (TR -110) to Permit No. C-1981-019. <br />TR -110 proposes four geotechnical drill holes adjacent to Wilson Reservoir and State <br />Highway 13. These borings are necessary to obtain data for future boring under State Highway <br />13 to install a raw water pipeline to support the Collom mining operation, and to obtain data to <br />construct a new pump house at Wilson Reservoir. Colowyo will be incorporating the required <br />information related to this drilling program in Section 12 of the 2017 Annual Reclamation <br />Report in accordance with Colowyo's permit to mine commitments. <br />With this additional geotechnical drilling it is requested that the Division provide a <br />revised reclamation cost estimate to include this drilling in the reclamation activities to occur <br />onsite. <br />Also included with this technical revision are a revision application, a change of index <br />sheet to ease incorporation into the permit document, and a public notice for your review. If you <br />should have any additional questions or concerns please feel free to contact Tony Tennyson at <br />(970) 824-1232 or tteMson@tristategt.org. <br />DJC:TT:dbr <br />AN EQUAL OPPORTUNITY/AFFIRMATIVE ACTION EMPLOYER <br />A Touchstone Energy'Cooperative, <br />Sincerely, <br />Daniel J. Casiraro <br />Senior Manager <br />Environmental Services <br />CRAIG STATION ESCALANTE STATION NUCLA STATION <br />P.O. BOX 1307 P.O. BOX 577 P.O. BOX 698 <br />CRAIG, CO 01626-1307 PREWITT, NM 87045 NUCLA, CO 81424.0696 <br />970-824-4411 505-876-2271 9704164-7316 <br />