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peabovall <br />Twentymile Coal Company 29515 Routt County Road #27 <br />Oak Creek, CO 80467 <br />970.879.3800 <br />Mrs. Janet Binns arc ED June 2, 2008 <br />Environmental Protection Specialist <br />Colorado Division of Minerals and Geology SUN0?? <br />1313 Sherman Street, Room 215 anon, <br />Denver, Colorado 80203 piv. 0an c' an ga ety <br />(303) 866-4933 imiln9 <br />RE: Twentymile Coal Company - Foidel Creek Mine (Permit No. C-82-056), Minor Revision <br />(MR08-228) for TORT Dewatering Well No. 2 <br />Dear Mrs. Binns: <br />Twentymile Coal Company (TCC) requests CDRMS approval of a Minor Revision (MR08-228) to the <br />approved Permit, for drilling, completion, operation, and reclamation of a second mine dewatering well <br />(IO-Right (IORT) Dewatering Well No. 2) and associated ancillary facilities, located at the existing TORT <br />(previously identified as the Eastern Mining District (EMD) Dewatering Facility) dewatering installation. <br />The new dewatering well will be drilled at the IORT dewatering installation close to the existing IORT <br />dewatering well. The purpose of the second well is both to increase the available pumping capacity for <br />mine dewatering, and to provide a backup dewatering well. The IORT mine dewatering installation is <br />important to TCC's ongoing mining and related operations, as it supplies a significant portion of the <br />operational water required. <br />Water from the existing IORT Mine Dewatering Well, which pumps accumulated mine inflows from a <br />sump in the sealed Eastern Mining District, is pumped to the surface by a 320hp high-capacity <br />submersible pump, at a rate of approximately 550 gpm. The pump discharge is currently transferred by a <br />series of surface and underground pipelines to the Area 1 Pit in the TCC Mine Facilities Area for use in <br />either coal preparation operations or for storage and subsequent use as a back-up source for the <br />operational mine water system. <br />As part of the 6MN facilities project (TR05-48, MR07-224), TCC is currently constructing a new pipeline <br />running approximately 7,750 feet from the existing TORT Dewatering Pipeline to the existing 6MN <br />Million-Gallon Tank. The pipeline will be constructed of 10-inch HDPE pipe, buried to a depth of <br />approximately six feet, with one sub-grade crossing (bored under) of Fish Creek. This new pipeline will <br />allow water from the IORT Dewatering installation to be routed either to the Area 1 Pit or to an existing <br />mine water borehole at the 6MN facilities for direct transfer and use underground. <br />The I ORT Dewatering Well No. 2 will include a pumping system installation similar to the existing IORT <br />Dewatering Well. The new 320hp pump will provide the capability to supply water to the Area 1 Pit at a <br />rate of approximately 550gpm, or deliver water to the 6MN facilities at a rate of approximately 700gpm <br />(in addition to the approximately 550gpm supply to the Area 1 Pit from the existing IORT Dewatering <br />• Well). <br />The ancillary facility requirements for the new l ORT Dewatering Well No. 2 will include modification of <br />the existing drainage and sediment control system, extension of the existing facilities pad, a minor <br />G:\Environmental\REVISION\MINOR-RV\MR08-228 TORT Dewatering Borehole #2\MR08-228 TORT Dewatering Well No. <br />2 TL.doc