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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 29, 2017 <br />Mr. Zach Trujillo <br />Environmental Protection Specialist <br />Colorado Division of Reclamation, Mining & Safety <br />Department of Natural Resources R��P-�Vep <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 till <br />RE: Colowyo Coal Company L.P.p'Vj$1Qn of Reclamation, <br />Permit No. C-1981-019 Mining & safety <br />Technical Revision No. 115 <br />Raw Water Line — Taylor Creek Crossing <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 115 (TR -115) to Permit No. C-1981-019. <br />TR -115 proposes a revised alignment of the raw water pipeline to Collom and elevated <br />crossing of the raw water line over Taylor Creek. The currently approved water line alignment <br />to Collom follows the Colowyo access road and makes a "u" turn and follows the Colowyo haul <br />road down to the Gossard Loadout before turning west towards Collom. The alignment <br />proposed under TR -115 removes the "u" turn of the water line and provides a straight alignment <br />to the west towards Collom. <br />Under TR -115, Rule 4 is being submitted in its entirety. Section 4.05.18 has been revised <br />in response to the new water pipeline alignment, but Rule 4 as a whole has been repaginated and <br />submitted to correct issues within the pagination of that section. Rule 2 has been submitted to <br />remove old bonding information that was no longer current, a Rule 3 has also been submitted to <br />provide correct citations to the current bond related information in Volume 13. <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. It is <br />also requested that the Division calculate the increase in reclamation liability for the additional <br />disturbance that is proposed under this technical revision. <br />AN EQUAL OPPORTUNrrY/AFF/RMA77VEACMN EMPLOYER CRAIG STATION ESCALANTE STATION NUCLA STATION <br />P.O. BOX 1307 P.O. BOX 577 P.O. Box as <br />A Touchstone Energy' Cooperative 01* CRAIG. CO 8106.1307 PREWITT, NM 87045 NUCIA, Co 81424 -OM <br />970-824-4411 505476.2271 970.864-7316 <br />