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PeabVmoll <br />Twentymile Coal <br />29515 Routt County Road 27 <br />Oak Creek, CO 80467 <br />970.879.3800 <br />Mrs. Janet Binns <br />Environmental Protection Specialist <br />Division of Reclamation, Mining, and Safety <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />(303) 866-4944 <br />RECEIVED <br />AUG 2 0 2008 <br />Division o nd Mining <br />aSaf? <br />August 18, 2008 <br />RE: Foidel Creek Mine (Permit No. C-82-056) - Technical Revision TR07-61, 6MN Mine <br />Water Storage Reservoir Technical Adequacy Revisions II <br />Dear Janet: <br />With this submittal, Twentymile Coal Company (TCC) is providing revised design information <br />reflecting modification of the 6MN Mine Water Storage Reservoir, to allow reservoir construction to <br />proceed in a timely manner. The previously submitted design information generally remains the same, <br />with the minor modification of lowering the level of the emergency spillway, so that the reservoir is no <br />longer a jurisdictional impoundment under applicable provisions of the Office of the Colorado State <br />Engineer. With the reduction in the level of the emergency spillway, the maximum design mine water <br />storage volume has been reduced accordingly, with the other design storage volumes (ie: 100-year, 24- <br />hour stormwater storage, and pump buffer storage) remaining the same. The Reservoir is still designed <br />as a non-discharging storage reservoir, with adequate level controls and freeboard to assure that <br />discharge does not occur, even under a worst-case scenario (ie: all storage components at maximum <br />levels). <br />Included in this revision submittal are two copies of all PAP text, and supporting materials that have <br />been revised. Revised materials provided for insertion/replacement are identified, and placement <br />instructions provided, by the attached Summary of Revisions/Additions. Given seasonal construction <br />limitations, we would appreciate your timely review and action on this revision submittal package and <br />look forward to approval of the pending Technical Revision application. To facilitate your review, we <br />have included a copy of the revised text with revisions highlighted. Thanks for your continuing <br />cooperation and assistance. Please feel free to contact me with any questions regarding this submittal <br />or related matters. <br />Best <br /> <br />Manager <br />cc: Mike Berdine/TCC <br />Matt Florence