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PeabodH <br />Twentymile Coal Company 29515 Routt County Road #27 <br />Oak Creek, CO 80467 <br />970.879.3800 <br />Mrs. Janet Binns October 23, 2008 <br />Environmental Protection Specialist RECEIVED <br />Colorado Division of Minerals and Geology <br />1313 Sherman Street, Room 215 OCT 2 7 2008 <br />Denver, Colorado 80203 Divisio,10 1 1 Reclamation, <br />(303) 866-3567 X8107 Mining and Sa%ty <br />RE: Twentymile Coal Company - Foidel Creek Mine (Permit No. C-82-056), Minor Revision (MR08-231) <br />for 0-Entry Water Borehole <br />Dear Mrs. Binns: <br />Twentymile Coal Company (TCC) requests CDRMS approval of a Minor Revision (MR08-231) to the approved <br />Permit, for drilling, completion, operation, and reclamation of a single mine dewatering borehole, surface <br />installation, and connecting pipeline at the 0-Entry location, to facilitate the transfer of water from the Mine to the <br />Area 1 Pit Mine Water Storage Reservoir. The new borehole, which will be drilled as a maximum 16-inch diameter <br />drillhole, approximately100 feet deep, will be drilled in a previously disturbed area adjacent to the existing 0-Entry <br />Mine Ventilation Fan. The borehole will daylight into active ventilated mine workings, so TCC has incorporated <br />appropriate lightening protection for the surface installation in compliance with applicable MSHA requirements. <br />Piping from the proposed borehole will connect to the mine water system in the 0-Entry, and to the existing Site <br />109 water discharge line to the Area 1 Pit Mine Water Storage Reservoir. Valves will be used to control flow <br />through the borehole and allow isolation of the piping from underground to the surface, if desired or necessary. At <br />the surface, a simple wellhead, consisting of a partially buried 6-foot section of 48-inch CMP pipe with a locking. <br />steel cover will serve to protect the well casing and enclose the control valves. Because the new borehole and <br />pipeline will be located within existing disturbance areas, no soil salvage and no modification of the existing <br />drainage and sediment control system or extension of the existing facilities pad will be necessary. <br />This submittal includes revised PAP text and supporting materials, as identified by the attached Summary of <br />Revisions/Additions, and a project bond estimate covering new system components. TCC would like to proceed <br />with this project as soon as possible in order to complete the work before winter sets-in, therefore we appreciate <br />your consideration and cooperation in facilitating timely review and approval. Once you have had opportunity to <br />review the accompanying information, please feel free to contact me with any questions or to discuss related <br />matters. <br />Best regards, <br />kTwe;ntymile C pany <br />Jerry M. tleton <br />Envir ntal Manager <br />cc: Mike Berdine/TCC <br />G:\Environmental\REVISION\MINOR-RV\MR08-231 0-Entry Water Borehole\MR08-231 0-Entry Water Borehole TL.doc