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<br />J. J. Dudash -2- June 8, 2009 <br />B. DRMS - Due to the proximity of the proposed fan to Hubbard Creek, <br />please provide additional information concerning the likelihood of dust <br />deposition from rock dust or coal fines on the surrounding area. <br />BRL - The active workings will be no closer than 1,200 feet to the <br />ventilation fan thus minimizing the likelihood of rock dust or coal fines <br />being exhausted from the mine. The mine ventilation fan will have an up- <br />blast deflector so any material exhausted from the fan will be widely <br />dispersed. MSHA regulations prohibit accumulations of coal dust in the <br />mine since it is an explosive hazard. Rock dust is finely crushed <br />limestone, an inert material. It is placed on the coal ribs and roof with a <br />wet duster. Bulk dust is placed onto the mine floor. Airborne coal dust is <br />significantly reduced or eliminated by coating the coal surfaces with rock <br />dust. Therefore, very little, if any, coal dust will be exhausted from the <br />ventilation fan. Rock dusting operations do put crushed limestone into the <br />air circuit. At times rock dust may be exhausted from the fan. The up- <br />blast deflector will widely disperse any of the inert rock dust that is <br />exhausted from the ventilation fan. <br />C. DRMS - Please provide additional information on plans to abate visual <br />effects of the fan through paint color, etc. The Forest Service can assist in <br />the selection of an appropriate color for the facility. <br />BRL - The applicant commits to painting the facility in accordance with <br />UDDA-FS requirements. <br />Amended pages 2.05-65 & 66 are enclosed. The preceding noise and dust discussion <br />was copied to the amended pages. <br />Sincerely, <br />J. E. Stover, P.E. <br />Consulting Engineer <br />Cc: Bill Bear