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©~~ <br />Twentymile Coal Company <br />;2 i <br />Vim" ~ i <br />August 30, 2001 <br />Mr. John A. Kuzar ~~-.~6` 1, ~. <br />District Manager '~ t <br />Coal Mine Safety and Health Administration ~G 3 0 2001 <br />P.O. Box 25367 ' ~> -... <br />Denver, Colorado 80225-0367 - t ?-s.,,~-~.;.. ;, , <br />RE: Foidel Creek Mine <br />ID #OS-03836 <br />Underground Waste Disposal <br />Dear Mr. Kuzar: <br />We are requesting approval for storage of our preparation plant thickener undertlow into the sealed area <br />of the East Mining District. This slurry will be carried downdip by a 4-inch pipe to the gob side of the <br />seals in either the 6 Right, 7 Right, or the 8 Right Section. This is depicted on the attached map. The <br />pipe will be 4-inch aluminum from the borehole at Crosscut #7 of Main North to the return side of the <br />seals. A 4-inch steel pipe with a "P"-trap will be utilized through the seals. The pipes will be grounded to <br />prevent static electricity. The seals will be well ventialted to disperse any leakage caused by the <br />displacement of the void behind the seals. The seals will not impound any water or thickener material. <br />We plan [o pump approximately 128,000 gallons of slurry per operating shift, with an approximate <br />maximum expected volume of 19.2 million gallons per year. The Thickener slurry is comprised of 25% <br />solids or I8 tons per hour of coal and ash fines mixture. The plant usually operates with the thickener in <br />operation on a 12-hour shift. for approximately 200 days per year. This is approximately 36,000 tons of <br />coal and ash fines placed into the gob on an annual basis. <br />The gradient of the proposed settling area ranges from 3.5 to 12 degrees toward the l0 Right dewatering <br />borehole sump. The water will be pumped back to the surface via the l0 Right dewatering borehole and <br />recycled back to the preparation plant facility. <br />If you have any questions concerning this matter, please call me at (970) 870-2713 <br />Thank you. <br />Sincerely, <br />t~ ~~ ~ <br />R. Lincoln Derick <br />Safety Manager <br />cc: Bill Bennett Dennis Bouwens Gary Buchan Jun Forquer Bill lvy <br />Bob Johnson Mike Ludlow Rick Mills Pat Sollars Dave Wallace <br />RU7_AK 141.DOC <br />29515 ROUTT COUNTY ROAD M27, OAK CREEK, CO 80467 PHONE (970) 879-3800 FA% (970) 879-8050 <br />