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J. E. STOVER & ASSOCIATES, INC. <br />2352 NORTH 7T" STREEET, UNIT B <br />GRAND JUNCTION, COLORADO 81501 <br />PHONE: (970) 245 -4101, FAX 242 -7908 <br />MINE ENGINEERING <br />MINE RECLAMATION <br />August 2, 2013 <br />Susan Burgmaier <br />Division of Reclamation, Mining & Safety <br />1313 Sherman St., Room 215 <br />Denver, CO 80203 <br />Re: Bowie Resources, LLC, Bowie No. 2 Mine <br />Technical Revision #79, Expand Material Storage Area <br />Supplemental Information <br />Permit C- 1996 -083 <br />Dear Ms. Burgmaier: <br />CIVIL ENGINEERING <br />CONST. MANAGEMENT <br />AUG 0 6 2013 <br />Division of Reclamation, <br />Mining & Safety - <br />By letter dated July 5, 2013, Bowie Resources, LLC, submitted an application for a technical <br />revision to increase the size of the material storage area located east of the B -Seam portals. <br />The following narrative explains the supplemental information provided. <br />The northeastern end of the expanded material storage area lies over the subdrainage system. <br />The elevation of the northern end of the expanded material storage area is 6664'. The original <br />ground elevation at the northwest side of the material storage area is 6650'. The original ground <br />elevation at the northeast side of the material storage area is 6600'. There should not be any <br />conflict between the material storage excavation and the subdrainage system since there are 64 <br />feet of vertical clearance between original ground and the northeast end of the material storage <br />area <br />Maps 20 and 21 -2 are provided. The drainage area for ditches C -5, C -10 and C -11 changed as <br />a result of this revision. This change inflow impacts down gradient ditches C -14 and C -16. <br />There is no significant change in the required size of the impacted drainage ditches. Culvert C -7 <br />will be extended to a total length of about 400 feet to accommodate the material storage area. <br />expansion. The design for culvert C -7 is shown on page Exh -8 -32vi. <br />Volume II Map 20 and 21 -2 <br />Volume III Pages Exh -8- 29, 29i, 31, 32vi, 65, 68, 69, 72, 74 <br />Sincerely, <br />J. E. Stover, P.E. <br />Consulting Engineer <br />Cc: Bureau of Land Management - Electronic <br />USDA -FS - Electronic <br />Paonia Library <br />Bill Bear <br />