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TRI-STATE GENERATION AND TRANSMISSION ASSOCIATION, INC. <br />HEADQUARTERS: P.O. BOX 33695 DENVER, COLORADO 80233-0695 <br />August 25, 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. 114 <br />Collom Haul Road Clean Water Diversion <br />Dear Mr. Trujillo, <br />X00 <br />o� x"00 <br />303-452-6111 <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 114 (TR -114) to Permit No. C-1981-019. <br />TR -114 proposes a clean water diversion above the Collom Haul Road (at approximately <br />Station 280+00 on Map 25E Sheetl), to convey surface water flows away from a cut slope to <br />assist with the long term stability of the slope. <br />Included with this technical revision are a revision application, a change of index sheet to <br />ease incorporation into the permit document, and a public notice for your review. It is also <br />requested that the Division calculate the increase in reclamation liability for the additional <br />disturbance that will occur with this proposed clean water diversion. <br />If you should have any additional questions or concerns please feel free to contact Tony <br />Tennyson at (970) 824-1232 or ttennyson ,tristate .org. <br />Sincerely, <br />Daniel J. Casiraro <br />Senior Manager <br />Environmental Services <br />DJC:TT:der <br />Enclosure <br />AN EQUAL OPPORTUNRY/AFF(RYATIVEACTJON EMPLOYER CRAIG STATION ESCALANTE STATION NULLA STATION <br />P.O. BOX 1307 P.O. BOX 577 P.O. Box 698 <br />A Touchstone Energy' Cooperative �t�k CRAIG, CO 816261307 PREWITT, NM 87045 NUCLA, CO 81424.0698 <br />`�„-..1 970.824-4411 505-8762271 970.864-7316 <br />