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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 /> September 21, 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 Mune(Permit No. C-1981-008) <br /> Technical Revision No.77(TR-77) <br /> Adequacy Response <br /> Dear Mr. Bowles: G," `9 s0A-`q) <br /> Tri-State Generation and Transmission Association, Inc. (Tri-State)is the parent <br /> company to Elk Ridge Mining and Reclamation, LLC New Horizon Mine.The New Horizon <br /> Mine operates under Division of Reclamation, Mining and Safety(DRMS)Permit No. C-1981- <br /> 008. <br /> Tri-State received your adequacy review for TR-77 dated April 3, 2017. Tri-State on <br /> behalf of the New Horizon Mine has the following response to your comment: <br /> 1. Item Resolved. <br /> 2. Item Resolved. <br /> 3. Item Resolved. <br /> 4. Item Resolved. <br /> 5. Item Resolved. <br /> 6. It is proposed that monthly water levels no longer be collected but no explanation was <br /> given to support this change. Please provide a discussion and data justifying why <br /> water levels should not be collected and reported. <br /> NH Response: As proposed under TR-75 quarterly water levels are more than <br /> adequate to contribute additional data to an already extensive data set for the long <br /> term monitoring plan for water levels. This change also allows for alignment with <br /> the quarterly sampling that is conducted by New Horizon at all groundwater <br /> monitoring locations. <br /> DRMS does not seethe relevance of TR-75 to quarterly water level sampling. TR-75 <br /> appears to be in relation to post-mine land use and interim vegetation monitoring. <br /> Additionally, MT-7 adequacy item 4.05.13(1)—Groundwater Monitoring requested <br /> a written interpretation of the monitoring data, identifying trends and including <br /> AN EQUAL OPPORTL N YIAFRRUA17VE ACTION EMPLOYER CRAIG STATION ESCAI ANTE STATION NUCLA STATION <br /> P.O.BOX 1307 P.O.BOX 577 P.O.BOX 698 <br /> A Touchstone EneWCooperadve 0,41 CRAX:,CO 81626.1307 PRWITT,KM 87045 NUCIA.CO 111424.0661e <br /> ,��„ 970-824-4411 505-976.2271 970.844.7316 <br />