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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 />June 9, 2017 <br />Mr. Brock Bowles <br />Environmental Protection Specialist <br />Colorado Division of Reclamation, Mining and Safety <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />RE: New Horizon North Mine <br />Permit No. C-2010-089 <br />RN -01 Adequacy Review <br />Dear Mr. Bowles: <br />RE ;EIVED <br />JUN 13 2017 <br />Division of Reclamation, <br />Mining & Safety <br />Tri-State Generation and Transmission Association (Tri-State) has received your adequacy <br />review letter for RN -01, dated February 14, 2017 and provides the following responses to your <br />comments on behalf of the Elk Ridge Mining and Reclamation's New Horizon North Mine. <br />Section 2.05.6(3) — Mitigation of the Impacts of Mining Operations <br />1. Groundwater monitoring wells GW -N56, GW -N57 and GW -N58 were previously anticipated <br />to become the points of compliance wells, but it is not clear if or at what point this will occur. <br />Please clarify the identification of the point of compliance wells. <br />Response: Sections 2.04.7, 2.05.6(3) and 2.05.6(3)(b)(v) of the permit application package <br />have been updated to clarify that groundwater monitoring well GW -N56, GW -N57 and GW - <br />N58 have been designated as points of compliance. <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 <br />permit document. If you have any questions regarding the enclosed adequacy review responses, <br />please contact Tony Tennyson at (970) 824-1232 or ttennysongtristategt.org. <br />DJC:JS:der <br />Enclosures <br />cc: Frank Ferris (via email) <br />Chris Gilbreath (via email) <br />Jason Storey (via email) <br />Tony Tennyson (via email) <br />File: G474 -11.3(21)c-2 <br />AN EQUAL OPPORTUNITY /AFFIRMATIVE ACTION EMPLOYER <br />A Touchstone Energy CooperativeL <br />Sincerely, <br />Daniel J. C iraro <br />Senior Manager <br />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 81626-1807 PREINIIT, NM 87045 NUCIA, CO 81424.0698 <br />970.624-4411 506-172-3200 970-164-7816 <br />