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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 />October 25, 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 />RECEIVED <br />Denver, CO 80203 <br />OCT 2 u 2017 <br />RE: Colowyo Coal Company L.P. <br />Permit No. C-1981-019 <br />Division of Reclamation, <br />Technical Revision No. 116 <br />Mining & Safety <br />CoDom Dewatering Plan <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 />technical revision 116 (TR -116) to Permit No. C-1981-019. <br />TR -116 proposes a revised dewatering plan for the Collom Pit under Exhibit 7 Item 22B. <br />The currently approved dewatering plan can be found in Exhibit 7 Item 21 (Sections 6 and 7). <br />Since much of Exhibit 7 Item 21 report contains baseline hydrology information for the Collom <br />operation, that exhibit will remain in the permit. A note has been added to the cover sheet for <br />that exhibit directing the reader to the appropriate exhibit containing the dewatering plan <br />proposed under TR -116 in Exhibit 7 Item 22B. <br />Also included with this technical revision are a revision application, a change of index <br />sheet to ease incorporation into the permit document, and a public notice for your review. If you <br />should have any additional questions or concerns please feel free to contact Tony Tennyson at <br />(970) 8241232 or ttennyson(a),tristate t.00rg. <br />Sincerely, <br />14 _/_ �' � � <br />Daniel J. Casiraro <br />Senior Manager <br />Environmental Services <br />DJC:TT:der <br />Enclosure <br />AN EQUAL OPPORTUNITY/AFFRMATIVEACTION EMPLOYER CRAIG STATION ESCALANTE STATION NUCLA STATION <br />P.O. BOX 1307 P.O. BOX 577 P.O. BOK 890 <br />A Touchstone Energy' Cooperative��� CRAN3. CO 81426.1307 PREWITT, NM 87045 NUCI.A, CO 01424.0858 <br />► t 970-874-4411 505-076-2271 970.864-7316 <br />