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J. E. STOVER & ASSOCIATES, INC. <br />P.O. BOX 60340 <br />GRAND JUNCTION, COLORADO 81506 <br />PHONE: (970) 245-4101, FAX 242-7908 <br />MINE ENGINEERING CIVIL ENGINEERING <br />MINE RECLAMATION CONST. MANAGEMENT <br />DECEIVED <br />January 3, 2007 JAN 0 5 2001 <br />Divlsiun of Reclamation, <br />J. J. Dudash (vuning and Safety . <br />Division of Reclamation, Mining & Safety <br />1313 Sherman St., Room 215 <br />Denver, CO 80203 <br />RE: Bowie No. 2 Mine, Permit No. C-96-083, Bowie Resources LLC <br />Technical Revision No. 44, New West Expansion of Gob Pile No. 2, Adequacy Review <br />Dear Mr. Dudash: <br />The DRMS email dated January 3, 2006, transmitted its adequacy comments regarding the <br />referenced technical revision. Following are Bowie Resources responses to the DRMS <br />comments and concerns: <br />DRMS: Ditch Grade Min and Max - F18 <br />Minimum Grade Depth -ditches F1, F13, F17 and F18. <br />Minimum Grade Velocity -all of the v ditches. <br />Maximum Grade Depth -ditches F1, F12, F13, F17 and F18. <br />Maximum Grade Velocity -all of the v ditches except W Div #2. <br />Riprap D50 Inch- ditches F11, F14 and East Div. <br />Peak Flow -ditches F4 and F7. <br />BRL: Please see updated App B-8 <br />DRMS: Ditch W. Div #1 needs to have a "trapezoidal" designation in the table on page App B- <br />8. <br />BRL: Please see updated App B-8 <br />DRMS: I don't see any designs that confirm the Maximum Grade Depth and Velocity for ditch <br />W Div #2. <br />BRL: Please see new page App-B-22a <br />DRMS: The table on page App B-8 shows a Ditch Grade Min and Max of 5% for the East <br />Diversion ditch. However, Figure 1 shows the last portion of the East Diversion ditch has a <br />substantially larger gradient. <br />