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0 <br />TRI-STATE GENERATION AND TRANSMISSION ASSOCIATION, INC. <br />HEADQUARTERS: P.O. BOX 33695 DENVER, COLORADO 80233-0695 <br />January 25, 2019 <br />303-452-6111 <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 />D <br />RE: New Horizon Mine (Permit No. C-1981-008) RECE�►E <br />Technical Revision No. 87 (TR -87) JAN 2 g 2019 <br />Adequacy Review Response <br />Dear Mr. Bowles: 010100 OF M L <br />10 <br />MINING <br />Tri-State Generation & Transmission Association (Tri-State) has received your adequacy <br />review letter for TR -87, dated January 18, 2019 and provides the following responses to your <br />comments on behalf of the Elk Ridge Mining and Reclamation's New Horizon Mine. <br />S <br />1. The area of land and the volume of water expected to be drained to the trench drain was <br />not included on Map 2.05.3(3)-32 nor in the associated text. Also, SedCad modeling for <br />the trench drain and riprap sizing were missing. Please submit the following: SedCad <br />Modeling for trench drain, volume of water to be carried in the drain, drainage area <br />acres serving trench drain and rip rap sizing. <br />Response: The trench drain is a ground water collection system that does not collect <br />surface runoff. Therefore, the trench drain was not modelled in SEDCAD with a surface <br />watershed area. However, as indicated in Attachment 2.05.3(3)-32, trench drain discharge <br />has been modelled as a constant inflow of 1,000 gpm that flows directly into Pond 013. <br />Since the purpose of the erosion protection inlet is embankment stabilization and not to <br />convey flow, no SECAD channel designs or rip -rap sizing have been included. Also, <br />Attachment 2.05.3(3)-32 has been updated to include reference to Map 2.05.3(3)-32. <br />Also included with this adequacy response package are materials revised in response to your <br />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 ttennyson(a,tristate tgt org. <br />DJC:JSS:der <br />Enclosures <br />AN EOUAL OPPORTUNITY /AFFIRMATIVE ACTION EMPLOYER <br />A Touchstone Energy' Cooperative <br />Sincerely, <br />Daniel J. Casiraro <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 81626.1307 PREWIT7 NM 87045 NUCLA. CO 81424-0698 <br />970.824-4411 505-876.2271 970-864-7316 <br />