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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, 2018 <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 />Minor Revision No. 184 <br />Axial Basin Substation Expansion <br />Dear Mr. Trujillo, <br />RECEIVED <br />APR 12 2018 <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 />minor revision 184 (MR -184) to Permit No. C-1981-019. <br />MR -184 includes a discussion in Section 4.12 of Volume 1 about the expansion of the <br />Axial Basin Substation within the permit boundary. Tri-State owns and operates the Axial <br />Basin Substation, and will be expanding the substation footprint to accommodate additional <br />transformers. This work, while occurring within the permit boundary, is not related to <br />Colowyo's mining operation and will not require Colowyo to permit and bond for these ground <br />related disturbances. <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:der <br />Enclosure <br />AN EQUAL OPPOFMMr Y /AFFIRMATIVE ACTION EMPLOYER <br />A Touchstone Energy' Cooperative 0.0 <br />Sincerely, <br />Daniel J. Casiraro <br />Senior Manager <br />Environmental Services <br />CRAIG STATION ESCALANTE STATION NULLA STATION <br />P.O. BOX 1307 P.O. BOX 577 P.O. BOX 698 <br />CRAIG, CO 81626-1307 PREWITT, NM 87045 NUCLA, CO $1424.0698 <br />970-824-4411 505-876.2271 970.864-7316 <br />