2011-11-22_REVISION - C1982056 - Laserfiche WebLink

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Peabod 1111 ENERGY Twentymile Coal, LLC Mr. Jason Musick Environmental Protection Specialist Colorado Division of Reclamation, Mining, & Safety 1313 Sherman Street, Room 215 Denver, Colorado 80203 (303) 866 -3567 x 8134 RE: Foidel Creek Mine (Permit No. C -82 -056) - Minor Revision (MR11 -259), 6MN Reservoir Lower Relief Drain Jason: Twentymile Coal, LLC (TC) requests CDRMS approval of the subject Minor Revision to the approved Permit to construct a Lower Relief Drain in the flat area on the south side of the 6MN Reservoir embankment. Following construction of the 6MN Reservoir, it was noted during regular pond inspections that surface runoff would collect and pool in the flat area just off the south toe of the Reservoir embankment. Pooling of water in this area is a concern, since it would potentially mask any seepage from the Reservoir, and over time, could adversely affect stability. TC proposes to construct two short connecting drainage channels, totaling up to approximately 400 feet, to drain both any standing water and future runoff from this area to the fence -line to the south, where the water would flow through a well- vegetated area prior to draining to a small, un -named existing tributary drainage to Fish Creek. Construction would involve using a small tracked dozer to remove and windrow soil and vegetation on one side of the drainage segments; excavation of the drainage segments, which would be "V' or flat bottom ditches up to 8 feet wide and 4 feet deep; placement of rock or synthetic control materials at up to three locations in the drainage channels to control flow velocities until vegetation reestablishes; replacement of soil materials over the constructed channel segments; and revegetation. Any excess excavated material would be stockpiled in the 6MN Pad area, where it would be used for future reclamation of the pad. As a minor surface disturbance that will be revegetated following construction, TC proposes to retain and not reclaim the ditches, which will eventually silt in and blend with the surrounding terrain. This submittal includes revised PAP text and maps /drawings addressing the location of the proposed drainage segments. New and revised PAP materials are identified by the enclosed Summary of Revisions /Additions. TCC would like to proceed with this project as soon as possible, therefore we appreciate your consideration and cooperation in facilitating timely review and approval. Once you have had opportunity to review the accompanying information, please feel free to contact me with any questions or to discuss related matters. Best regards, Twen , LLC erry N i eton Environ al Manager cc: Mike Berdine /TC niECENDD NOV 222011 29515 Routt County Road 27 Al Ot hcedamatlon, oak Creek, CO 80467 find Safety 970.879.3800 November 17, 2011