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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 />March 19, 2018 <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 />Technical Revision No. 119 <br />Adequacy Response <br />Dear Mr. Trujillo, <br />RECEIVED <br />MAR 212018 <br />Division of Reclamation, <br />Mining & 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). Tri-State received your adequacy letter dated March 16, 2018 and is providing <br />the response below to your adequacy concern on behalf of Colowyo. The Colowyo Mine <br />operates under Permit No. C-1981-019. <br />1. On proposed Volume 1, Rule 4, page 2, in the first paragraph under Section 4.03.1 it <br />states that the main Haul Road A for Colowyo operation is shown on Maps 21 and 25F. <br />However, Map 25F is approved as Collom Haul Road — Elevated Crossing and appears <br />it should be referenced to proposed Map 25G. Please update Volume 1, Rule 4, page 2 <br />with the correct reference. <br />Response: The reference to Map 25F has been revised to Map 25G on page 4-2 as <br />requested. <br />2. The Division has performed a reclamation cost estimate to reclaim the disturbances <br />associated with the Haul Road A widening. The total value of this estimate is <br />$406,462.07 (see attached cost estimate). The Division's cost estimate is consistent with <br />previous cost estimates approved by both the Division and Colowyo. The Division <br />respectfully requests a response from Colowyo with any questions regarding the cost <br />estimate or an acceptance of the Division's estimate. <br />Response: The Division has estimated the increase in Colowyo's reclamation liability for <br />this technical revision to be $406,642.07. Colowyo concurs with the Division cost <br />estimate for TR -119. <br />AN EQUAL OPPORTI.WMY/AFF01IM471VEACTION EMPLOYER <br />A Touchstone EneWCooperative 001, <br />CRAIG STATION ESCALANTE STATION NUCLA STATION <br />P.O. BOX 1307 P.O. BOX 577 P.O. BOX 898 <br />aalc. w 81426.1307 PREWITT, MM 97045 Muco, co 974740698 <br />970.8244411 5058767271 970.0647316 <br />