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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 30, 2015 <br />Mr. Rob Zuber <br />Environmental Protection Specialist <br />Colorado Division of Reclamation, Mining & Safety <br />Department of Natural Resources <br />1313 Sherman Street, Room 215 RE <br />Denver, CO 80203 <br />RE: Colowyo Coal Company L.P. <br />MAY 020, <br />Permit No. C -1981 -019 �sIon 01 Resafey <br />Minor Revision No. 14, Proposed In -Pit Drilling Program — South Tayl09fivinin9 & <br />Dear Mr. Zuber: <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 141 (MR -141) <br />to Permit No. C- 1981 -019. <br />MR -141 proposes in -pit exploratory drill -hole locations within the South Taylor Pit. This in -pit <br />drilling program will provide Colowyo with additional information to define the coal seams and geologic <br />structure within the South Taylor Pit. All proposed drill sites will be within the current disturbance <br />footprint, and additional surface disturbance will not be necessary with the proposed drilling locations. <br />Furthermore, Colowyo will be incorporating the required information related to this drilling program in <br />Section 12 of the 2015 Annual Reclamation Report in accordance with Colowyo's permit to mine <br />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 submittal. <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 />BAW:TT:pvt <br />Enclosure <br />Sincerely, <br />Barbara A. Walz <br />Senior Vice President <br />Policy & Compliance <br />Chief Compliance Officer <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- 8244411 505- 972 -5200 970 -864 -7316 <br />