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COLORADO <br />Division of Reclamation, <br />A.. Mining and Safety <br />Department ut Natural Rexuwce, <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />Inter Office Memorandum <br />TO: Jason Musick, DRMS <br />Tabetha Lynch <br />FROM: Robin Reilley, GISP, DRMS <br />Date: November 3, 2016 <br />RE: Trapper Mine TRI. 17 File No. C1981010 <br />Adequacy Review <br />As requested I have completed my review of the TRI 17 ditch design for the Deacon Jeffery Diversion. It <br />appears that for channels 4, 5, and 6 the design discharge is adequate. Also, the subwatershed areas, <br />slopes and hydraulic lengths appear consistent. Peak discharge for structures 1 and 3 appear consistent. <br />Based on DRMS review of the current mine plan, areas associated with the Deacon Jeffery Diversion are <br />permitted for future disturbance. As such Curve Numbers (CN), used in the submitted design do not <br />reflect the current mine plan. DRMS believes a Curve Number is the appropriate curve number for the <br />current design. Curve numbers submitted were 66, 72 and 63. <br />a) Please provide Deacon Jeffery Diversion designs reflecting a CN of 86, <br />b) or, discuss the land use or land cover conditions used to arrive at the curve <br />numbers for the three watersheds in the Deacon Jeffery Diversion. <br />Kind Regards <br />Robin Reilley, GISP <br />Environmental Protection Specialist <br />P 303.866.3567 ext 8105 1 F 303.832.8106 <br />1313 Sherman Street St., Suite 215, Denver, CO 80203 <br />robin.reilley(c�state.co.us I http://mininQ.state. coms <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. Hickentooper, Governor I Mike King, Executive Director I Virginia Brannon, Director <br />