2016-02-29_REVISION - C1981019 (4)

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TRI-STATE GENERATION AND TRANSMISSION ASSOCIATION, INC. HEADQUARTERS: P.O. BOX 33695 Mr. Zach Trujillo Environmental Protection Specialist Colorado Division of Reclamation, Mining & Safety Department of Natural Resources 1313 Sherman Street, Room 215 Denver, CO 80203 DENVER, COLORADO 80233-0695 303-452-6111 February 26, 2016 RE: Colowyo Coal Company L.P. Mine Permit No. C-1981-019, Permit Revision No. 04 (PR -04), Collom Mine Plan Revision Dear Mr. Trujillo, RECEIVED FEB 2 9 2016 DM&ON OF RECLAMATION MMMAND89ETY Tri-State Generation and Transmission Association Inc. (Tri-State), is the parent company to Axial Basin Coal Company, which is the general partner to Colowyo Coal Company L.P. (Colowyo). Therefore, Tri-State on behalf of Colowyo is submitting revisions to the PR -04 application package, and adequacy responses for the surface water adequacy review on behalf of Colowyo. The first part of this submittal package proposes changes to the mine and reclamation plan timing. Part of the public comment period for the Collom Environmental Assessment being conducted by the Office of Surface Mining, Reclamation, and Enforcement, identified a discrepancy to the mine and reclamation plan timing. Tri-State is correcting this inconsistency with these proposed application materials. Included with this change, Tri-State is submitting a revised Map 23B (Mine Plan) and Map 29B (Spoil Grading). These revisions required the surface water hydrology model(s) to be updated also to be consistent with the mine and reclamation timing proposed within the application. The second part of this submittal package is to address outstanding surface water hydrology adequacy review comments that were provided via email from Mr. Rob Zuber on January 25, 2016. These comments have not been formally submitted to Tri-State to date, but the application materials being revised for the mine and reclamation plan timing directly relate to some of these adequacy comments. Therefore, the adequacy comments and responses have been included under this cover. Where the mine and reclamation plan timing changes have directly affected the outstanding adequacy comment; in the response it is noted what has been changed to the hydrology model in regards to the revisions to the mine and reclamation plan timing. Responses that have been deemed adequate have been included for historical purposes only. ITEM 1. Response is adequate. Please inform the Division of any progress made regarding discussions with the Division of Water Resources. Response: No further response required. ITEM Z Response is adequate. ITEM 3. Response is adequate. AN EQUAL OPPORTUNITY /AFFIRMATIVE ACTION EMPLOYER A Touchstone Energy' Cooperative CRAIG STATION ESCALANTE STATION NUCLA STATION P.O. BOX 1307 P.O. BOX 577 P.O. BOX 698 CRAIG, CO 81626-1307 PREWITT, NM 87045 NUCLA, CO 81424-0698 970-824-4411 505-972-5200 970-864-7316