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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 />December 22, 2017 <br />Mr. Brock Bowles <br />Environmental Protection Specialist RECEIVED <br />Colorado Division of Reclamation, Mining and Safety <br />1313 Sherman Street, Room 215 DEC 2r, 2017 <br />Denver, CO 80203 <br />Division of Reclamation, <br />RE: New Horizon North Mine (Permit No. C-2010-089) Mining & Safety <br />Permit Revision No. 2 (PR -02) <br />Second Adequacy Review Response <br />Dear Mr. Bowles: <br />Tri-State Generation & Transmission Association (Tri-State) has received your adequacy review <br />letter for PR -02, dated December 5, 2017 and provides the following responses to your comments on <br />behalf of the Elk Ridge Mining and Reclamation's New Horizon North Mine. <br />Section 2.05.4(2) (d) Overburden and Topsoil Handling Plan <br />1. Item Resolved. <br />Section 2.05.4Q(e) Revegetation <br />2. Tri-State is proposing to use "the current year annual alfalfa yield for Montrose County" as <br />the basis for the success criterion for the Garvey Property irrigated pasture. The data will be <br />obtained from the USDA - National Agricultural Statistics Service. The success standard <br />proposed by Tri-State is adequate. Although it must be noted that the `current year annual <br />alfalfa yield' is published by the USDA in November of the year following any production <br />sampling at the mine site. By using the current year data as the reclamation standard, all <br />future bond release applications will be delayed about I year waiting for the appropriate <br />data to be published. Does Tri-State want to commit to this timeline for this standard? <br />Response: Section 2.05.4(2)(e) have been revised to indicate that success comparison will <br />occur against either the Montrose Co. current annual alfalfa yield or the long term average. <br />Also included with this adequacy response package are materials revised in response to your <br />adequacy comments and a change of index sheet to ease incorporation of this material into the permit <br />document. If you have any questions regarding the enclosed adequacy review responses, please <br />contact Tony Tennyson at (970) 824-1232 or ttennysongtri state gt.org. <br />DJC:JS:der <br />Enclosures <br />AN EQUAL OPPORTUNITY/ AFFIRMATIVE ACTION EMPLOYER <br />A Touchstone Energy' Cooperative <br />Sincerely, <br />Daniel J. Ca 'raro <br />Senior Manager, Environmental Services <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 87045 NULLA, CO 81424-0698 <br />970-824-4411 505-876.2271 970-864-7316 <br />