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Peab'Rdq <br />Twentymile Coal Company 29515 Routt County Road #27 <br />Oak Creek, CO 80467 <br />970.879.3800 <br />R?CENED <br />Mrs. Janet Binns August 5, 2008 <br />Environmental Protection Specialist AUG <br />O 6 ?QQ? <br />Colorado Division of Minerals and Geology <br />1313 Sherman Street, Room 215 pWision of t e ka n' <br />Denver, Colorado 80203 WWM and S9* <br />(303) 866-4933 <br />RE: Twentymile Coal Company - Foidel Creek Mine (Permit No. C-82-056), Minor Revision (MR08-229) <br />for 18RT Mine Atmosphere Control Boreholes <br />Dear Mrs. Binns: <br />Twentymile Coal Company (TCC) requests CDRMS approval of a Minor Revision (MR08-229) to the approved <br />Permit, for drilling, completion, operation, and reclamation of one or two boreholes and associated ancillary <br />facilities at the 18-Right location, to address MSHA compliance requirements relative to monitoring and control of <br />mine atmosphere in sealed mine areas. The new borehole(s) will be drilled on the existing 18-Right pad area, and <br />will parallel the existing 18RT ventilation intake shaft. The purpose of the 18RT Mine Atmosphere Control (MAC) <br />borehole(s) will be to allow for remote monitoring of mine atmosphere in sealed gob areas of the Northern Mining <br />District (NMD), and to provide for methane drainage and/or nitrogen injection, as necessary, to assure an inert, <br />non-explosive atmosphere in the sealed gob areas. <br />It is anticipated that fixed pipelines within the 18RT MAC Borehole(s) will connect underground to one or more <br />manifolded pipe systems running through the bleeder entries to each of the sealed gob areas. Valved pipes, <br />extending through the seals in each area, will connect to the pipe system, allowing atmospheric monitoring, as well <br />as withdrawal of methane or injection of nitrogen, as appropriate to meet MSHA compliance requirements. At the <br />surface wellhead (with appropriate grounding and lightning protection) the fixed pipelines will connect to <br />automated atmospheric monitoring equipment, and may also connect to a portable skid-mounted methane pump <br />and/or a skid-mounted nitrogen generator, as necessary. Because the new borehole(s) and all associated ancillary <br />facilities will be located within the existing disturbance area, no modification of the existing drainage and sediment <br />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 ground conditions allow to address critical MSHA compliance issues, therefore we <br />appreciate your consideration and cooperation in facilitating timely review and approval. Once you have had <br />opportunity to review the accompanying information, please feel free to contact me with any questions or to discuss <br />related matters. <br />Best regards, <br />TwentymilF_ s, ompany <br />Jerry ettleton <br />Envi ental Manager <br />cc: Mike Berdine/TCC <br />Chris Van Arsdale/TCC <br />G:\Environmental\REVISION\MINOR-RV\MR08-229 18RT Mine Atmosphere Control Borehole\MR08-229 18RT MAC <br />BoreholeTL.doc