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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 />April 10, 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 RECEM') <br />Denver, CO 80203 <br />RE: Colowyo Coal Company L.P. APR 1 2 N 17 <br />Permit No. C-1981-019 ®1V1g1eh of Reclamation, <br />Minor Revision No. 172 Mining & Safety <br />Collom Topsoil Stockpiles <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 on behalf of Colowyo is submitting three (3) copies of <br />minor revision 172 (MR -172) to Permit No. C-1981-019. <br />MR -172 proposes to revise the footprint of topsoil stockpile 25A to allow closer access to <br />the stockpile from the Collom Haul Road, and to increase the overall footprint to ensure <br />sufficient room is available to stockpile topsoil for the life of the Collom operation. The entire <br />footprint shown on Map 28C Sheet 1 will not be constructed if topsoil volumes that are stripped <br />do not require the entire footprint as proposed. MR -172 also proposes a new topsoil stockpile <br />21C adjacent to the Collom Temporary Facilities area. Topsoil stockpile 21C will allow an <br />additional option to stockpile topsoil to ensure efficient operations on the ground during <br />construction of the Collom Haul Road. <br />Included in this minor revision are a revision application and a change of index sheet to <br />ease incorporation of this minor revision into the permit document. If you should have any <br />additional questions or concerns please feel free to contact Tony Tennyson at (970) 824-1232 at <br />your convenience. <br />DJC:TT:dbr <br />Enclosure <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 81626-1307 PREWITT, NM 87045 NUCLA, CO 81424-0698 <br />970-824-4411 505-972-5200 970-864-7316 <br />