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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 />August 1, 2016 <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. 158 <br />In -Pit Drilling — South Taylor Pit <br />Dear Mr. Trujillo, <br />AUG G 4 2016 <br />OMSICN OF FECL AMATION <br />MINING ANO 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 158 (MR -158) to Permit No. C-1981-019. <br />MR -158 proposes in -pit exploratory drill hole locations within the South Taylor Pit. This <br />in -pit drilling program will provide Colowyo with additional information to define the coal <br />seams and geologic structure within the South Taylor Pit. All proposed drill sites will be within <br />the current disturbance footprint, and additional surface disturbance will not be necessary with <br />the proposed drilling locations. Furthermore, Colowyo will be incorporating the required <br />information related to this drilling program in the 2016 Annual Reclamation Report in <br />accordance with Colowyo's permit to mine commitments. <br />This drilling program was originally permitted and approved under MR -141 and MR - <br />153. Therefore, the information provided in revised Exhibit 23A replaces the drilling program <br />that was approved under MR -141 and MR -153. It is anticipated there should be an increase in <br />the reclamation cost estimate under this proposal, and it is requested that the Division perform <br />the required calculation to determine the increase in the reclamation liability. <br />AN EQUAL OPPORTUNITY/AFFIRMATIVE ACTION EMPLOYER <br />A Touchstone Energy' Cooperative <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 PREWIrr, NM 67045 NUCLA, CO 81424-0688 <br />970-824-4411 505-972-5200 970-864-7316 <br />