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0 2.05.6 <br />3. In order to maintain habitat effectiveness for big game, the applicant <br />will limit road construction. Necessary roads will be designed to <br />minimize disturbance to topsoil and vegetation and located to promote <br />effective road closure. New roads on Forest Service land will be <br />authorized by a special use permit. New temporary roads will be <br />reclaimed as soon as practicable. The roads will be obliterated using <br />all or a combination of recontouring, discing or ripping, placing <br />physical barriers at key points, seeding with a Forest Service <br />approved seed mix, signing and closures orders. Roads which are <br />reconstructed will be returned to their original contour so there will be <br />no net increase in accessibility to motorized traffic. <br />Regarding the Hubbard Creek ventilation fan: <br />Noise - The applicant purchased the Hubbard Creek Fan from <br />Spendrup Fan Co. Spendrup estimates the fan will produce a <br />sound pressure level of 97 dBA at a distance of 20 feet. Spendrup <br />further estimates the sound level can be reduced to about 82 dBA <br />by installing an outlet silencer and insulating the sides of the fan <br />diffuser. The applicant will install both of the sound mitigation <br />measures. <br />Dust - 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 <br />fines being exhausted from the mine. The mine ventilation fan will <br />have an up-blast deflector so any material exhausted from the fan <br />will be widely dispersed. MSHA regulations prohibit accumulations <br />of coal dust in the mine since it is an explosive hazard. Rock dust <br />is finely crushed limestone, an inert material. It is placed on the <br />coal ribs and roof with a wet duster. Bulk dust is placed onto the <br />mine floor. Airborne coal dust is significantly reduced or eliminated <br />by coating the coal surfaces with rock dust. Therefore, very little, if <br />any, coal dust will be exhausted from the ventilation fan. Rock <br />dusting operations do put crushed limestone into the air circuit. At <br />times rock dust may be exhausted from the fan. The up-blast <br />deflector will widely disperse any of the inert rock dust that is <br />exhausted from the ventilation fan. <br />(2)(b & c) <br />No response required. <br />• <br />TR-62 2.05 - 66 06/09 <br />ppQavED <br />6/3o/o q