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<br /> <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br /> <br />April 2, 2015 <br /> <br />To: Brock Bowles <br /> <br />From: Jason Musick <br /> <br />RE: Roadside Mine, C-1981-041 <br /> TR-65, Adequacy Review Memo <br /> <br /> <br /> <br />Per your request, I have reviewed the proposed the riprap segment at the outlet end of the East Diversion <br />Ditch #2 designs associated with the above referenced revision. According to the revision Snowcap Coal <br />Company (SCC) is proposing to remove a 12” CMP culvert at the outlet of the East Diversion Ditch #2 and <br />replace the culvert with a permanent trapezoidal riprap ditch segment. The Division reviewed the <br />proposed activities to determine if the utilization of the riprap channel segment of the East Diversion <br />Ditch #2 would be adequate to serve as the outlet of the ditch segment. <br /> <br />Based on the approved East Diversion Ditch #2 designs located in Appendix 13-2, beginning on Page NDEC- <br />8, SCC proposed to construct an outlet ditch segment of trapezoidal design with a 3’ bottom width, 1.5:1 <br />side slopes lined with MIRAFI 600X or equivalent fabric and installing 12.00 in D50 riprap. Based on the <br />proposed design, the Division finds that the proposed outlet ditch segment will be sized adequately to <br />control the run-off from the ditch and there are no adequacy concerns with regard to the proposed <br />action. <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />1313 Sherman Street, Room 215, Denver, CO 80203P 303.866.3567 F 303.832.8106 http://mining.state.co.us <br /> <br />John W. Hickenlooper, Governor | Mike King, Executive Director | Virginia Brannon, Director <br />