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1111 Peabodq <br />Twentymile Coal, LLC 29515 Routt County Road 27 <br />Oak Creek, CO 80467 <br />970.879.3800 <br />Mr. Jason Musick, Environmental Protection Specialist RECEIVED October 9, 2014 <br />Division of Reclamation, Mining, and Safety <br />1313 Sherman Street, Room 215 OCT 14 2014 <br />Denver, Colorado 80203 <br />(303) 866 -3567 X 8134 Division Reclamation, <br />Mining &Safety <br />RE: Twentymile Coal, LLC - Foidel Creek Mine (Permit No. C -82 -056), Minor Revision (MR14 -283) — <br />5 -Main North Cement Borehole <br />Dear Mr. Musick: <br />Twentymile Coal, LLC (TC) requests CDRMS approval of a Minor Revision to our existing approved Permit <br />for installation, operation, and reclamation of a new cement borehole, to be located over our 5 -North Mains, <br />extending into the existing Wadge Seam Mains to supply concrete for the planned Wolf Creek Seam ramp <br />development and construction activities. The borehole will extend to a depth of approximately 1,500 feet, will <br />be drilled to a 12.25 -inch diameter, and cased to a 9.875 -inch diameter. Subsequent to this initial use, it is <br />anticipated that the borehole could be retained and utilized for other purposes to support the future mining and <br />related operations in the Wolf Creek Seam. The proposed borehole would be accessed from the paved County <br />Road (RCR33), using the existing established access for the 6 -Main North Shaft Facility, with a new light -use <br />road to the borehole pad location, as shown on Map 24 (4/4) and Figure 49AA -F 1. <br />The proposed cement borehole will require construction of approximately 0.6 mile of new light -use road from <br />the existing established 6 -Main North access road. A new borehole pad (approximately 200 x 200 ft.) will be <br />constructed to support both the initial drilling and borehole completion activities, and subsequent cement <br />delivery and related operations. The 5 -Main North (5MN) Cement Borehole installation will consist of the new <br />light -use road and borehole pad; adjacent soil material stockpiles, and the lined and grouted borehole extending <br />into the 5 -North Mains in the Wadge Coal Seam. The proposed pad and road location are on a minor ridgeline, <br />so upgradient drainage will be limited. The limited amount of drainage from upgradient areas will be <br />intercepted and routed around the borehole pad by a small upgradient diversion ditch on the north side of the <br />pad and the road will not cross any natural drainages, so no culvert installations will be needed. Drainage from <br />the small borehole pad will be controlled under a Small -Area Exemption. The 5MN Cement Borehole <br />installation will remain in place until it is no longer needed to support ongoing or anticipated future mining <br />operations. Reclamation of this installation will involve plugging and sealing the borehole, regrading the pad <br />and road, soil material replacement, and reseeding. <br />This submittal includes revised PAP text, exhibits; and maps, addressing the location, configuration, operation, <br />maintenance, and reclamation of the proposed Utility Borehole installation. New and revised PAP materials are <br />identified by the attached Summary of Revisions /Additions. We would like to proceed with this project as soon <br />as possible, to take advantage of favorable conditions during the remainder of the 2014 construction season. <br />We, therefore, appreciate your consideration, cooperation, and assistance in facilitating timely review and <br />approval of this revision application. After you have opportunity to review the accompanying information, <br />please feel free to contact me with any questions or to discuss submittal materials or related matters. <br />Best regards, <br />Twentymile Coal, LLC <br />Jerry M. Nettleton <br />Manager Environmental airs <br />