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2. In order to protect nest sites of sensitive avian species the applicant will <br />10 survey proposed development sites located in forest habitats for snags. If <br />snags are located, the location of surface disturbance will be modified as <br />necessary to avoid the loss of snags. <br />3. In order to maintain habitat effectiveness for big game, the applicant will limit <br />road construction. Necessary roads will be designed to minimize disturbance <br />to topsoil and vegetation and located to promote effective road closure. New <br />roads on Forest Service land will be authorized by a special use permit. <br />New temporary roads will be reclaimed as soon as practicable. The roads <br />will be obliterated using all or a combination of recontouring, discing or <br />ripping, placing 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 no net <br />increase in accessibility to motorized traffic. <br />Regarding the Hubbard Creek ventilation fan: <br />Noise - The applicant purchased the Hubbard Creek Fan from Spendrup <br />Fan Co. Spendrup estimates the fan will produce a sound pressure level <br />of 97 dBA at a distance of 20 feet. Spendrup further estimates the sound <br />level can be reduced to about 82 dBA by installing an outlet silencer and <br />insulating the sides of the fan diffuser. The applicant will install both of the <br />sound mitigation 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 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 />(2)(b & c) <br />No response required. <br />• <br />PR -12 2.05-99 06/10 <br />A PPRoV EP <br />IIII ell O <br />