2011-08-09_REVISION - C1982056 (2)

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Peabod 1111 ENERGY Mr. Jason Musick, Environmental Protection Specialist Division of Reclamation, Mining, and Safety 1313 Sherman Street, Room 215 Denver, Colorado 80203 (303) 866 -3567 X 8134 RE: Twentymile Coal, LLC - Foidel Creek Mine (Permit No. C -82 -056), Technical Revision (TR11 -78) — 16-Left Utility Borehole Dear Mr. Musick: Twentymile Coal, LLC (TC) requests CDRMS approval of a Technical Revision to our existing approved Permit for installation, operation, and reclamation of a new utility borehole installation, to be located over an extension from the 16 -Left Gateroads (16LT) in our active Western Mining District (WMD). The utility borehole would initially serve as a conduit to transfer concrete from the surface to the underground workings to provide supplemental support for an area where elevated geologic stresses were encountered in the previous longwall panel. Subsequent to this initial use, it is anticipated that the borehole would be retained and utilized as a supplemental utility borehole for transfer of concrete, gravel, or other materials to the underground workings for use in the WMD. The proposed facilities would be accessed from the paved County Road (RCR27), using the existing access for the 17 -Left Concrete Borehole (MR11 -253), with a new light -use road to the borehole pad location, as shown on Map 24 (4/4) and Figure 49Z -F1. The proposed utility borehole installation will require construction of approximately 1.25 mile of new light -use road from the existing 17LT access point to the borehole pad location, and construction of a new borehole pad (approximately 200 x 300 ft.). The 16LT Utility Borehole installation will consist of the new light -use road and borehole pad; adjacent soil material stockpiles, and the lined and grouted borehole extending into the active mine workings. A total of six culverts will be installed along the light -use road to pass natural drainage under the road. The proposed pad location is on the side of a small knoll, so upgradient drainage will be limited. The limited amount of drainage from upgradient areas will be intercepted and routed around the borehole pad by a small upgradient diversion ditch on the west side of the pad. Drainage from the small borehole pad will be controlled under a Small -Area Exemption. The 16LT Utility Borehole installation will remain in -place until it is no longer needed to support ongoing or anticipated future mining operations. Reclamation of this installation will involve plugging and sealing the borehole, regarding the pad and road, soil material replacement, and reseeding. This submittal includes revised PAP text, exhibits; and maps, addressing the location, configuration, operation, maintenance, and reclamation of the proposed Utility Borehole installation. New and revised PAP materials are identified by the attached Summary of Revisions /Additions. We would like to proceed with this project as soon as possible, to take advantage of favorable conditions during the 2011 construction season. We, therefore, appreciate your consideration, cooperation, and assistance in facilitating timely review and approval of this revision application. After you have opportunity to review the accompanying information, please feel free to contact me with any questions or s . iscuss submittal materials or related matters. Best regards, Twentymile Coal, LLC Jerry M. Nettleton Environmental Manager Twentymile Coal, LLC RECEIVED AUG 0 9 2011 DIVISIVII V, KeciamatiOn. Mining and Safety 29515 Routt County Road 27 Oak Creek, CO 80467 970.879.3800 August 5, 2011