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• (./. III IIIIII III IIII III <br />~ Twentymile Coal Company <br />December 15, 1994 <br />Mr. Kent Gorham <br />Environmental Protection Specialist <br />Office of Mined Land Reclamation <br />Division of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />C'-. <br />29515 Routt Cowry Roed Y27 <br />Oak Creek, CO 80167 <br />Phone (303) 879.3800 <br />RECEIVED <br />DEC 2 0 1994 <br />Division of Minerals ~ ueaogy <br />RE: Minor Revision 94-112, Permit No. C-82-056, Foidel Creek Mine, Revision of <br />Southwest Borehole Drilling Method <br />Dear Mr. Gorham: <br />Please find the revised text pages for Permit C-82-056 to reflect the change in drilling <br />methods and shaft sealing for the Southwest Borehole. The drilling method has been changed <br />from raise boring to downhole drilling due to the un-availability of suitable raise boring <br />equipment and contractors within the time frame required for this project. We are also <br />proposing to seal the shaft with excess soil material rather than cement due to the amount <br />of cuttings generated on the surface caused by the drilling change. <br />The TR-17 bond for plugging and sealing the shaft has been recalculated to reflect the use of <br />soil to fill the shaft. This change resulted in a bond reduction of S18,228. <br />If you have any questions or require any additional information, please contact me at your <br />convenience. <br />Best regards, <br />G,. ~~l~ <br />Ashley House <br />Environmental Specialist <br />attachments <br />cc: BLM (2) <br />OSM (2) <br />-~'- ~ - <br />