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<br /> <br />1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 https://mining.state.co.us <br />Jared Polis, Governor | Dan Gibbs, Executive Director | Virginia Brannon, Director <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br /> <br /> <br /> <br /> <br /> <br /> <br />January 18, 2019 <br /> <br />Chris Gilbreath <br />Tri-State Generation and Transmission Association <br />12050 North Pecos St. Suite 100 <br />Westminster, CO 80234 <br /> <br /> <br />Re: New Horizon Mine (Permit No. C-1981-008) <br /> Technical Revision No. 87 (TR-87) <br /> Adequacy Review <br /> <br />Dear Mr. Gilbreath: <br /> <br />The Colorado Division of Reclamation, Mining and Safety (Division) received your application for TR- <br />87 for the New Horizon Mine on December 17, 2018. The application was deemed complete on <br />December 21, 2018. TR-87 is proposing construction of an erosion protection inlet into Pond 13 to <br />accommodate a trench drain discharge into the pond. <br /> <br />The Division has finished its review of the TR-87 application and has the following questions and/or <br />comments: <br /> <br />1. The area of land and the volume of water expected to be drained to the trench drain was not <br />included on Map 2.05.3(3)-32 nor in the associated text. Also, SedCad modeling for the trench <br />drain and riprap sizing were missing. Please submit the following: SedCad Modeling for trench <br />drain, volume of water to be carried in the drain, drainage area acres serving trench drain and rip <br />rap sizing. <br /> <br /> <br /> <br />If you have any questions or need additional information, please contact me at (303) 866-3567 ext. 8142. <br /> <br />Sincerely, <br /> <br />Brock Bowles <br />Environmental Protection Specialist <br />brock.bowles@state.co.us