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V. 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 23, 2018 <br />Internal Memo <br />To: Brock Bowles, DRMS <br />From: Tabetha Lynch, DRMS <br />Re: New Horizon Mine (Permit No. C-1981-008) <br />Technical Revision No. 77 (TR -77) <br />Adequacy Review 3 <br />In regard to the adequacy responses relevant to the groundwater Review Memo, items 5-7, in Bold below, New <br />Horizon (NH) provided the following responses: <br />The Division finished its review of the TR -77 application and has the following questions and comments: <br />1. Resolved <br />2. Resolved <br />3. Resolved <br />4. Resolved <br />5. Resolved <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 />NH Response: As proposed under TR -75 quarterly water levels are more than adequate to contribute <br />additional data to an already extensive data set for the long term monitoring plan for water levels. This <br />change also allows for alignment with the quarterly sampling that is conducted by New Horizon at all <br />groundwater monitoring locations. <br />DRMS does not see the relevance of TR -75 to quarterly water level sampling. TR -75 appears to be in <br />relation to post mine land use and interim vegetation monitoring. Additionally, MT -7 adequacy item <br />4.05.13(1) - Groundwater Monitoring requested a written interpretation of monitoring data, identifying <br />pF COlO <br />H <br />1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 http://mining.state.co.us I <br />John W. Hickenlooper, Governor I Mike King, Executive Director I Virginia Brannon, Director ** <br />