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Peabody <br />Twentymile Coal Company <br />March 2, 2009 <br />Mrs. Janet Binns, Environmental Protection Specialist <br />Colorado Division of Reclamation, Mining, and Safety <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />(303) 866-3567 X8107 <br />29515 Routt County Road #27 <br />Oak Creek, CO 80467 <br />970.879.3800 <br />;,drnawn, <br />g1v?Wnln9 and Sate/ <br />RE: Twentymile Coal Company - Foidel Creek Mine (Permit No. C-82-056), Technical Revision <br />(TR09-66) for 18-Left Shaft and Associated Ancillary Equipment and Facilities <br />Dear Mrs Binns: <br />Twentymile Coal Company (TCC) requests CDRMS approval of a Technical Revision to our existing <br />approved Permit for construction, operation, and reclamation of a new shaft installation and associated <br />ancillary equipment and facilities for TCC's Western Mining District. The new shaft installation is <br />needed to provide adequate airflow for development and mining of the Western Mining District. <br />The 18-Left (18LT) Shaft installation will be located just west of Routt County Road 27 (RCR27), on the <br />side of a low ridge. A light-use road will be extended approximately 420 feet from RCR27 to this <br />location, and a pad and required drainage structures will be constructed. The completed shaft installation <br />will include a 425 x 500 foot shaft pad; 2 - two-cell lined cuttings pits (within the pad area); a 80 x 125 <br />foot transformer pad; a soil material stockpile, and a small two-cell sedimentation pond. An 17.5-inch <br />pilot hole will be drilled to verify site geology, and the borehole will be cased for use as a nitrogen <br />injection borehole. Two 6-foot diameter lined ventilation shafts (one intake and one return), <br />approximately 1,360 feet deep, will be blind-drilled from the shaft pad; and two concrete pads, anchored <br />to poured concrete piers, will be poured to support the shaft collars and as foundations for shaft facilities <br />and equipment. Following completion of both shafts, a mine ventilation fan, fan shroud, equipment <br />building, and silencer, will be installed on the return shaft; and an escape capsule, hoist, hoist building and <br />shaft heater will be installed on the intake shaft. Skid-mounted compressors and a nitrogen generator will <br />be installed on the cased borehole. Transformers and switching equipment will be installed on the <br />transformer pad, a grounding-bed with buried conductors will be established adjacent to the transformer <br />pad, and a 69KV powerline will be extended up to 3,000 feet (dependent on routing) from the existing <br />powerline to provide power to the shaft installation. A maximum of approximately 0.3 acres of new <br />surface disturbance will result from construction of the light-use road, with approximately 5.3 acres of <br />additional disturbance for all other components of the shaft installation. <br />This submittal includes supplemental baseline information for the affected areas, provided as exhibits for <br />inclusion in the PAP, and detailed design, operations, and reclamation information, provided as both <br />revised PAP text and exhibits; and revised maps, reflecting the location and configuration of the new <br />facilities, road, and powerline. New and revised PAP materials are identified by the attached Summary of <br />Revisions/Additions. <br />File: G:\Environmental\Revision\Technical Revision\\TR09-66 Cover Letter