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Peabody <br />Twentymile Coal <br />29515 Routt County Road 27 <br />Oak Creek, CO 80467 <br />970.879.3800 <br />FWCEiVED <br />Mr. Jason Musick, Environmental Protection Specialist March 30, 2010 <br />Colorado Division of Reclamation, Mining, and Safety MAR 3 1Z010 <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 DWWGn of Reclamatimtt, <br />(303) 866-3567 X8134 Ukft and Safety <br />RE: Twentymile Coal Company - Foidel Creek Mine (Permit No. C-82-056), Technical <br />Revision (TR10-72) for Coal Refuse Disposal Area Drainage Modification <br />Dear Mr. Musick: <br />Twentymile Coal Company (TCC) requests CDRMS approval of a Technical Revision to our existing <br />approved Permit for modification of the under-drain alignment for the approved Coal Refuse Disposal <br />Area (CRDA) Expansion (Approved under TR09-67, 11/13/09). This minor design modification shifts <br />the discharge point for the under-drain from Sedimentation Pond D to the nearby Area 1 Pit, allowing <br />for use of any drainage in the mine water system, and providing better control of the water relative to <br />mixing and water quality. <br />The proposed CRDA Drainage Modification shifts the north end of the under-drain approximately 120 <br />feet to the east. Other than this shift in alignment, the design of the under-drain and CRDA expansion <br />do not change, and the construction and stability of the CRDA expansion (as addressed by TR09-67) <br />are not affected. TCC has completed initial foundation preparation activities for the CRDA expansion, <br />including construction of the initial segments of the phased surface diversion ditches, and soil and <br />cover material recovery and stockpiling, and is currently proceeding with under-drain construction. <br />This submittal includes the revised text and maps necessary to identify, describe, and show the <br />proposed minor drainage design modification. Revised PAP materials are identified by the attached <br />Summary of Revisions/Additions. <br />As we are currently proceeding with under-drain construction, we would appreciate your <br />consideration, cooperation, and assistance in facilitating timely review and approval of this revision <br />application. After you have opportunity to review the accompanying information, please feel free to <br />contact me with any questions or to discuss submittal materials or related matters. <br />Best regards, <br />Twent e Co Company <br />Jerry 7ntal on <br />Envir Man ager <br />cc: Mike Berdine/TCC <br />Joe Shoemaker/TCC