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IUTRI-STATE GENERATION AND TRANSMISSION ASSOCIATION, INC. <br />- HEADQUARTERS: P.O BOX 33695 DENVER, COLORADO 80233-0695 303-452-6111 <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. 150 <br />Collom Geotechnical Drilling Program <br />Dear Mr. Trujillo: <br />January 6, 2016 <br />RECEIVED <br />JAN I � 2016 <br />DIVISION OF REOLMATION <br />MINING AND SAFETY <br />Tri-State Generation and Transmission Association, Inc. (Tri-State), is the parent company to <br />Axial Basin Coal Company, which is the general partner to Colowyo Coal Company L.P. (Colowyo). <br />Therefore, Tri-State on behalf of Colowyo is submitting three copies of this minor revision 150 (MR -150) <br />to Permit No. C-1981-019. <br />MR -150 proposes geotechnical drilling at fifteen sites within the disturbance footprint of the <br />Collom Facilities area, Collom Haul Road, and at Collom Haul Road/County Road 51 crossing. These <br />borings are necessary to obtain data for appropriate facilities design and construction. Surface <br />disturbance associated with the drilling locations will include brushing only to facilitate site access for a <br />small track mounted rig. Colowyo will be incorporating the required information related to this drilling <br />program in Section 12 of the 2015 Annual Reclamation Report in accordance with Colowyc's permit to <br />mine commitments. <br />Colowyo anticipates a minor increase in the reclamation liability associated with this drilling <br />program. Therefore, it is requested that the Division perform the required calculation to determine the <br />increase in the reclamation liability for this minor revision. <br />Also included in this revision application is a change of index sheet to ease incorporation into the <br />permit document and a revision application. If you should have any additional questions or concerns <br />please feel free to contact Tony Tennyson at (970) 824-1232 at your convenience. <br />DJC:TT:pvt <br />Enclosure <br />1N ci.FtJAL !tNl'!)t77U1t i 'IFFiRMAFfV: A[ PON EMPLOYER <br />A Touchstone Energv`CoopeDitive <br />Sincerely, <br />Daniel J. Casifaro <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 />