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Peabody <br />Twentymile Coal Company <br />RECEIVED <br />29515 Routt County Road #27 <br />Oak Creek, CO 80467 <br />970.879.3800 <br />January 26, 2009 <br />Mrs. Janet Binns <br />Environmental Protection Specialist <br />Colorado Division of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />(303) 866-3567 X8107 <br />JAN 2 7 2009 <br />Division of Reciamation, <br />Mining and Safety <br />Re: Twentymile Coal Company - Foidel Creek Mine (Permit No. C-82-056), Minor Revision (MR09- <br />234) - Shaft Heater Modifications <br />Dear Mrs. Binns: <br />Twentymile Coal Company (TCC) requests CDRMS approval of a Minor Revision to our approved Permit <br />for modification of the permitted shaft heater installations for the 18-Right (1.8RT) and 6-Main North <br />(6MN) ventilation intake shafts. A shaft heater was permitted (MR07-225) for the 18RT intake shaft, but <br />has not yet been installed. Temporary shaft heaters were permitted (MR07-227) and installed on the 6MN <br />intake shaft during winter 2007/2008, to address dangerous icing conditions in the shaft. Based on TCC's <br />experience with the 6MN temporary shaft heaters, a permanent shaft heater installation is proposed for the <br />6MN location, and modifications have been made to the design and layout for the 18RT shaft heater <br />installation. <br />Installation of the shaft heaters will allow for heating of ventilation intake air during the winter months to <br />maintain safe and comfortable temperature and humidity conditions in underground mine work areas. The <br />proposed modifications to the planned and permitted 18RT and 6MN shaft heater installations will not <br />significantly change the location and general configuration of these installations, will occur entirely within <br />the existing shaft pad areas, will result in no new surface disturbance, and will not affect existing drainage <br />and sediment control structures. The proposed modifications will involve: <br />6MN Shaft Heaters <br />Replacement (initially) of the two temporary shaft heaters and skid-mounted propane tank by six <br />temporary heaters and a larger skid-mounted propane tank, to increase BTU output <br />Subsequent replacement of the temporary heater units by four larger permanent heaters mounted on <br />concrete pads, installation of concrete pads and saddles to permanently mount the larger propane <br />tank, and replacement of the temporary propane supply hose with a buried propane pipeline running <br />from the supply tank to the heater pads <br />G:\Environmental\REVISION\MINOR-RV\MR09-234 Shaft Heater Modifications\MR09-234 Shaft Heater <br />Modifications TL.doc