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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 />February 5, 2007 <br />J. J. Dudash <br />Division of Reclamation, Mining & Safety <br />1313 Sherman St., Room 215 <br />Denver, CO 80203 <br />FHB 0 8 [uU/ <br />Division of P, nC; :,, peiron, <br />Mining and Safaty <br />RE: Bowie No. 2 Mine, Permit No. C-1996-083, Bowie Resources LLC <br />TR No. 44, West Expansion of Gob Pile No. 2, Adequacy Review #2 <br />Dear Mr. Dudash: <br />CIVIL ENGINEERING <br />CONST. MANAGEMENT <br />The DRMS letter dated January 22, 2006, transmitted its adequacy comments regarding the <br />referenced technical revision. Following are Bowie Resources responses to the DRMS <br />comments and concerns. Only outstanding issues are addressed. <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 />The December 26, 2006 submittal did not include a revised Appendix B summary table page <br />App B-8. A revised Appendix B summary table was provided in the submittal dated January 3, <br />2007. However, there appear to be several entries in the table that still need revision when <br />compared to the hydrology designs. For ditch F2, both of the flow velocities are 2.56, not 1.9. <br />For F3, both flow velocities are 1.98, not 1.5. For F5, both velocities are 2.8 instead of 2.1. For <br />F6, both velocities are 2.88, not 2.1. For F8, both velocities are 2.68, not 2.0. For FIO, both <br />velocities are 2.61, not 1.9. If you agree, please submit a revised Appendix B table. <br />BRL: Please see revised attached Appendix B <br />9. DRMS: Map 18, "Postmining Topography ", does not show an upland diversion ditch above <br />gob pile no. 1 and above the gob pile no. 2 extension proposed in TR-44. Please provide a <br />revised Map 18 and appropriate hydrology ditch designs for the upland diversion ditch for the <br />reclamation phase. <br />A revised Map 18 was provided in the December 26, 2006 submittal. However, the surface <br />disturbance line covers and obscures the extent of the ditch designation. Please revise Map 18, <br />if possible, to show both lines. <br />BRL: Please see updated and enclosed Map 18. <br />11. DRMS: Please identify shear strengths and material unit weights used to demonstrate <br />stability of the proposed additions to the approved gob piles [Rule 2.05.3(8) (a) (ii)(D)]. Please <br />reference the sources of information in revised text of revision pages. <br />