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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 />May 7, 2018 <br />Mr. Zach Trujillo <br />Environmental Protection Specialist <br />Colorado Division of Reclamation, Mining & Safety <br />Department of Natural Resources RECEIVED <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 MAY 0 9 2018 <br />RE: Colowyo Coal Company L.P. <br />Permit No. C-1981-019 <br />Minor Revision No. 186 <br />Collom In -Pit Drilling <br />Dear Mr. Trujillo, <br />Division of RedamatiA* <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 186 (MR -186) to Permit No. C-1981-019. <br />MR -186 proposes an in -pit drilling program within the Collom Pit. This drilling program <br />will allow Colowyo to further develop and refine its geologic model associated with the Collom <br />Pit. All of the drill holes, drill pads, and drill roads will be either be mined through during the <br />normal progression of the Collom Pit, or be associated with larger disturbance footprint <br />associated with the develop of the Collom Mine. <br />It is requested that the Division calculate the cost of reclamation liability associated with <br />this drilling program. <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 OPPORTUNITYIAFRRMATIVEACTION EMPLOYER <br />A Touchstone EneWCooperative /r <br />Sincerely, <br />Daniel J. Casi aro <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 81424-06W <br />970.824-4411 505-876-2271 970-864-7316 <br />