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OLO AL O <br /> Division of Reclamation, <br /> Miring and Safety <br /> Department of Natural Resources <br /> 1313 Sherman Street,Room 215 <br /> Denver,Co 80203 <br /> October 2.,2019 <br /> Kurt Blunt <br /> Blue Mountain Energy, Inc. <br /> 360 County Rd. 65 <br /> Rangely, CO 81648 <br /> Deserado Mine, -1 1-018 <br /> Technical Revision No.72 Second Adequacy Review <br /> Dear Mr. Blunt, <br /> The Colorado Division of Reclamation,Mining and Safety(the Division)received the <br /> Deserado Mine's submittal of responses to the Preliminary Adequacy Review. The <br /> Division has completed its review of the responses and has the following comments and <br /> questions: <br /> Rule 4.05 and 4.10. —Hydrologic Balance and water Control Measures <br /> Hydrology for R.P-A and Pond (Illustration 59) <br /> 3. The Division somewhat disagrees with the statement by Blue Mountain Energy <br /> (13ME) regarding the purpose of riser pipes. Another reason to use riser pipes is <br /> to limit the amount of sediment that is transported into the outlet (aka spillway) <br /> and downstream to the receiving water. we suggest that B1 IB reconsider the <br /> design of the primary spillway. Alternatively,please provide supporting <br /> information to show that your outlet design will not become plugged. <br /> 12. Several channels on Map 162 take nearly 180-degree turns, therefore baffles or <br /> other energy dissipation structures may be needed at these locations. Blue <br /> Mountain Energy should add a discussion of these structures(and possibly <br /> figures)to the design. <br /> 13. It appears that there are errors in the Structure Routing Details tables in the <br /> SEDCAD output{one table for each return event). Please address the fallowing <br /> and check all others for accuracy. <br /> a. There is no Structure# in the tables. <br /> I NW <br /> �CM <br /> 1313 Sherman Street,Roam 215,Denver,CO 80203 P 303.866.3567 F 303.832.8106 http://mining.state.co.us <br /> Jared S.Polis, Governor I Dan Gibbs,Executive Director I Virginia Brannon,Director } . <br />