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<br /> <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 | Bob Randal, Executive Director | Virginia Brannon, Director <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br /> <br /> <br />Inter Office Memorandum <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />RE: New Horizon; C-1981-008 <br />Technical Revision TR84 <br /> <br /> <br /> <br />A request was made to me on 6 August 2018 to assess the above referenced permit <br />revision as it pertains to surface water. I received the necessary materials at the <br />end of the day on 6 August with a due date of 9 August 2018. This review included <br />an analysis of Pond 016 SedCad modeling as follows with adequacy review <br />questions numbered and italicized. <br /> <br />A. SedCad model for Postmining Pond 16 10 year 24 hour event Sediment <br />Volume <br />It appears that the pond has the capacity to contain this event. <br /> <br />B. SedCad model for Post mining Pond 16 100 year, 24 hour event Containment <br />Analysis <br />It appears that the pond has the capacity to contain this event. <br /> <br />C. Post Mining Drainage Analysis Pond 016 (Map 1) <br />Appears adequate. <br /> <br />D. Pond 16 Plan View and Design Details (Map 2) <br />Appears adequate. <br /> <br /> <br /> <br />To: Brock Bowles, DRMS <br />From: Robin Reilley, GISP, DRMS <br />Date: 9 August 2018