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AVCOLORADO <br />Division of Reclamation, <br />Mining and Safety <br />Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />March 1, 2017 <br />Chris Gilbreath <br />Tri-State Generation and Transmission Association <br />12050 North Pecos St. Suite 100 <br />Westminster, CO 80234 <br />Re: New Horizon Mine (Permit No. C-1981-008) <br />Technical Revision No. 77 (TR -77) <br />Adequacy Review <br />Dear Mr. Gilbreath: <br />The Colorado Division of Reclamation, Mining and Safety (Division) received your application for TR -77 for <br />the New Horizon Mine on January 25, 2017. The application was deemed complete on February 4, 2017. TR - <br />77 is proposing to change the surface and ground water monitoring plan. <br />The Division finished its review of the TR -77 application and has the following questions and comments: <br />On page 2.04.7-26, last paragraph, a reference is made to Map 2.05.3(3)-3. The current version of the <br />permit references Map 2.04.7.1A on page 2.04.742. Please clarify that the revised page references the <br />correct map. <br />2. On page 25 of Section 2.04.7, various surface water monitoring sites are discussed. Some of the same <br />monitoring sites were discussed on page 27. Please combine the information on page 27 with that on <br />page 25 so that all the information regarding the various sites resides in the same place. <br />3. Page 30 is incorrectly paginated as page 27. Please revise. <br />4. Pages 30-33 comprise various tables. Please consider page layout such that each table is displayed in <br />its entirety on a single page. <br />5. Laboratory parameters are proposed to be changed from quarterly (February, May, August, and <br />November) to annually, during the second quarter but no explanation was given to support this change. <br />Please provide a discussion and data justifying the reduction in ground water monitoring frequency. <br />6. It is proposed that monthly water levels no longer be collected but no explanation was given to support <br />this change. Please provide a discussion and data justifying why water levels should not be collected <br />and reported. <br />\•Q9Q\Q <br />1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 http: //mining. state. co. us <br />John W. Hickenlooper, Governor I Mike King, Executive Director I Virginia Brannon, Director <br />