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COLORADO <br />Division of Reclamation, <br />Mining and Safety <br />Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />William A. Bear <br />Bowie Resources, LLC <br />P.O. Box 483 <br />Paonia, CO 81428 <br />April 18, 2018 <br />Re: Preliminary Adequacy Concern, Bowie No. 2 Mine, Permit No. C1996083, TR115 <br />Dear Mr. Bear: <br />The Division has reviewed Bowie Resources, LLC application material for technical revision No. 115. <br />This revision proposes to install temporary rip rap in Ditch F8, and permanent rip rap in a section of the <br />upland diversion ditch. The Division has identified two concerns with the submitted application that need <br />clarification or correction: <br />The extent of riprap for the East Diversion Ditch is somewhat inconsistent between the <br />three submitted maps. On Map 21-3 the symbol for riprap extends well above the <br />confluence with Ditch D -F1. On Map 15-3 and Map 20 the rip rap is shown ending at Ditch <br />D -F1. Please revise maps as appropriate and re -submit them to the Division. <br />2. On the page for Manning's equation calculations, the portion for the 30" half culvert should <br />possibly be removed since the "smart ditch" was the chosen alternative. Also, Volume IX, <br />page App. B-102 already exists in the permit (approved with MR -195). Therefore the <br />pagination number TR -115 page App. B-102 will need to be revised. Calculations <br />demonstrating Manning's Equation for Culvert T -F1 is has previously been approved with <br />MR -191 as page "13-103". Please correct TR -115 Culvert T -F1 Manning's Equation <br />calculation to page B-103. <br />The proposed decision date is June 5, 2018. Response to the noted concerns in advance of that date will <br />allow the Division to review and make a decision by the regulatory timeframe. Please call or e-mail me <br />should you have any questions or require additional information. <br />�- <br />Sincerely,� <br />Janet H. Binns <br />Environmental Protection Specialist III <br />Janet.binnskstate.co.us <br />CC: Tamme Bishop, J.E. Stover and Associates <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 I Robert W. Randall, Executive Director I Virginia Brannon, Director <br />