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J. E. STOVER & ASSOCIATES, INC. <br />2352 NORTH 7T" STREET, UNIT B <br />GRAND JUNCTION, COLORADO 81501 <br />PHONE: (970) 245-4101, FAX: (970) 242-7908 <br />MINE ENGINEERING <br />MINE RECLAMATION <br />May 18, 2018 <br />CIVIL ENGINEERING <br />CONST. MANAGEMENT <br />Janet Binns � � I �,��'� <br />Division of Reclamation, Mining & Safety <br />1313 Sherman St., Room 215 <br />� 45 <br />Denver, CO 80203 4E <br />Re: Bowie Resources, LLC, Bowie No. 1 Mine /VIMPJG f AND D SAFEECLAVTy <br />Technical Revision #115, revise underdrain location STY <br />Adequacy Response #1 <br />Dear Ms. Binns: <br />DRMS' letter dated April 18, 2018 transmitted its adequacy review for the referenced technical revision. <br />On behalf of Bowie Resources LLC, following are its responses to the DRMS' comment and concerns. <br />1. DRMS: The extent of riprap for the East Diversion Ditch is somewhat inconsistent <br />between the three submitted maps. On Map 21-3 the symbol for riprap extends <br />well above the confluence with Ditch D -F1. On Map 15-3 and Map 20 the rip rap <br />is shown ending at Ditch D -F1. Please revise maps as appropriate and re -submit <br />them to the Division. <br />BRL: The riprap location has been revised on Maps 15-3 and Map 20 to be <br />consistent with Map 21-3. In addition, the viewports have been changed to show <br />the full extents of the East Diversion Ditch. <br />DRMS: On the page for Manning's equation calculations, the portion for the 30" <br />half culvert should possibly be removed since the "smart ditch" was the chosen <br />alternative. Also, Volume IX, page App. B-102 already exists in the permit <br />(approved with MR -195). Therefore, the pagination number TR -115 page App. B- <br />102 will need to be revised. Calculations demonstrating Manning's Equation for <br />Culvert T-171 is has previously been approved with MR -191 as page "B-103". <br />Please correct TR -115 Culvert T-171 Manning's Equation calculation to page B-103. <br />BRL: In reference to the 30" smart ditch, the Operator would like to leave the half <br />culvert design in the permit. In the event the smart ditch fails, a half culvert would <br />be approved, on-site and ready to repair. Whereas there is no smart ditch <br />currently on site, it would have to be ordered, which would delay the repair time. <br />Please remove page App. B-102 from consideration, and replace with the attached <br />page App. B-103 (Page App. B-102 was a typo). And, in order for the pagination to <br />