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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 <br />MINE RECLAMATION <br />December 26, 2006 <br />CIVIL ENGINEERING <br />CONST. MANAGEMENT <br />J. J. Dudash ~t~ ~~ <br />Division of Reclamation, Mining & Safety R~~ <br />1313 Sherman St., Room 215 <br />Denver, co 80203 JAN U "L [t)01 <br />pivislon of Reclamation, <br />RE: Bowie No. 2 Mine, Permit No. C-96-083, Bowie Resources LLC Mining and safety , <br />Technical Revision No. 44, New West Expansion of Gob Pile No. 2, Adequacy Review <br />Dear Mr. Dudash: <br />The DRMS letter dated November 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 />Section 2.05.3(4) Ponds. Impoundments. Other Treatment Facilities and Diversions <br />1. DRMS: It does not appear that the Appendix B summary table on page App. B-8 has been <br />updated with the new hydrology design results. Please update the Appendix B summary table. <br />BRL: Operator confirmed peak flows and maximum slopes vs. peak flows and maximum <br />slopes for updated hydrology information shown on pages App. B-9 through B-22 and all <br />numbers match. Perhaps DRMS did not receive an updated copy? Appendix B, page App. B-8 <br />is included for use by DRMS. <br />2. DRMS: Please update the culvert summary table on page EXH-8-31 to include the new <br />culvert F2 hydrology design data located on page App. B-18. <br />BRL: Please see updated page EXH-8-31 for updated culvert F2 information. <br />3. DRMS: In the Appendix B summary table on page App. B-8, the ditch F12 depths and <br />velocities are different for minimum grade and maximum grade, even though the minimum and <br />maximum ditch grades are the same. Please explain or revise. <br />BRL: The ditch velocities should have been the same and were entered incorrectly. See <br />updated page App. B-8. <br />4. DRMS: In order to avoid confusion, please designate on Figure 3 which of the ditches <br />associated with Pond F are "V" ditches and which are trapezoidal ditches. <br />BRL: See Figure 3 for designation of "V" ditches and trapezoidal ditches. <br />5. DRMS: Figure 3 shows a typical "V" ditch detail cross section with sideslopes of 1.5H:1V. <br />However, the hydrology designs in Appendix B show that most of the "V" ditches associated <br />