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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 22, 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 /> \ker'W' <br /> 0 Safer! <br /> RE: Colowyo Coal Company L.P. <br /> Permit No. C-1981-019 <br /> Minor Revision No. 174 <br /> Collom In-Pit Drilling Program <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 174 (MR-174)to Permit No. C-1981-019. <br /> MR-174 proposes an in-pit drilling program within the Collom Pit box cut. This drilling <br /> program will allow Colowyo to further develop and refine its geologic model associated with the <br /> Collom Pit. All of the drill holes, drill pads, and drill roads will be either be mined through <br /> during the normal progression of the Collom Pit, or be associated with larger disturbance <br /> footprint associated with the develop of the Collom Mine. <br /> As previously discussed with the Division, since a reclamation bond has not been posted <br /> for the Collom box cut to date,the Division will need to calculate the cost of reclamation liability <br /> associated with 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 /> Sincerely, <br /> Daniel J. Casiraro <br /> Senior Manager <br /> Environmental Services <br /> DJC:TT:der <br /> Enclosure <br /> t.i5 :, ,`Loi! vA+-'�'}F7'l.,YiJ;Y1-1FFIRNOA`:!yt -1 d, 1-104- OY.rt' CRAIG STATION ESCALANTE STATION NUCLA STATION <br /> ' <br /> P.O.BOX 1307 P.O.BOX 577 P.O.BOX 698 <br /> A Touchstone Energy'Cooperative CRAIG,CO 81626-1307 PREWITT,NM 87045 NUCLA,CO 81424-0698 <br /> r,.. _ 970-824-4411 505-876-2271 970-864-7316 <br />