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COLORADO <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 15, 2016 <br />Mr. Chris Gilbreath <br />Tri-State Generation and Transmission Association, Inc. <br />P.O. Box 33695 <br />Denver, CO 80233-0695 <br />RE: New Horizon Mine, Permit No. C-1981-008 <br />MR -97 Adequacy Review <br />Dear Mr. Gilbreath: <br />The Division of Reclamation Mining and Safety (Division) received MR -97 on February 26, 2016. MR -97 <br />contains the responses to the Mid -Term Review (MT -07) adequacy questions, dated November 24, 2015. The <br />Division has the following comments and questions: <br />4.05.13(l) — Groundwater Monitoring <br />A written interpretation of monitoring data, identifying trends and including descriptions of <br />groundwater level and annual potentiometric surface maps was request to be included in the annual <br />hydrology reports. The operator provided a response that a written interpretation of the data will be <br />provided in the annual hydrology report, but there is no reference to when this will occur. The recently <br />submitted 2015 annual hydrology report did not include an interpretation of the data provided. Please <br />define that this additional interpretation of data will occur from 2016 forward. <br />2. With regard to groundwater level data, the operator referenced potentiometric surface maps in section <br />2.04.7 of PAP from 1987. This does not address the need to provide data relevant to mining impacts on <br />the groundwater aquifers, which should be included in the AHR. Please provide the groundwater <br />elevation data with an interpretation identifying any trends and mine impacts. This can be <br />accomplished with current annual potentiometric surface maps and/or graphical representation and an <br />explanation of the data. <br />If you have any questions, please contact me at (303) 866-3567 ext 8142. <br />Sincerely, <br />Brock Bowles <br />Environmental Protection Specialist <br />brock.bowles@state.co.us <br />QF CQ�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 * * 1g76 <br />