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COLORADO <br /># nfvWun of Feolamatioxi , <br />Miming arca safety <br />UgWlmer~r o4 N,lluraj RLSOUTCeS <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />Inter Office Memorandum <br />To: Brock Bowles, DRMS <br />From: Robin Reilley, M.S; GISP, DRMS <br />Date: 16 1an2019 <br />RE: New Horizon; C1981008 <br />Technical Revision, TR87 <br />I was requested to assess the above referenced permit revision with respect the proposal to <br />construct an erosion protection inlet to Pond 13 to accommodate trench drain discharge into the <br />pond with respect to Rules 4.05.5 Sediment Control Measures and 2.05.6(3), Protection of the <br />Hydrologic Balance. <br />My review of the maps and associated documents follow. <br />DRMS notes that as per Map 2.05.3(3)-32 and associated text there is no indication of the volume of <br />water expected to be transmitted in the trench drain, nor is there any reference to the the area of land to <br />be drained. Also, SedCad modeling for the trench drain and riprap sizing were missing. <br />The information provided is inadequate to make a determination of compliance with the above <br />mentioned rules. <br />Please submit the following: <br />1. SedCad Modeling for trench drain. <br />2. Volume of water to be carried in the drain <br />3. Drainage area acres serving trench drain <br />4. Rip rap sizing. <br />Please let me know if you have further questions. <br />Thank you <br />Robin Reilley, M.S; GISP <br />Environmental Protection Specialist <br />1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 http://mining.state.co.us I <br />*WL Jared Polis, Governor � Virginia Brannon, Director <br />