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Soil properties such as moisture content and particle size dictate the amount of dust generated from top- <br /> soil salvage and replacement. In order to control dust in topsoil operations, haulage routes are watered <br /> as needed to reduce dust emissions from scraper travel. Topsoil removal and replacement is done at <br /> slow speeds further reducing dust emissions. Topsoil stockpiles are either seeded, or mulched and <br /> seeded in the fall following construction to reduce wind erosion and attendant emissions. <br /> Blasting is used to loosen overburden material and coal seams to facilitate removal of these materials. <br /> This operation causes dust to be rapidly entrained in the localized area of the blast. The sequential <br /> blasting practiced at the mine helps reduce the amounts of particulates released. <br /> Blast hole drilling also contributes to fugitive emissions. Water injected drill suppression systems are <br /> used on all overburden drills to control these emissions. <br /> Roadsides, dam sites, drill sites, and retopsoiled spoil are all seeded in the fall to control fugitive dust <br /> emissions. <br /> Road surfaces are watered frequently to reduce dust levels. Three water trucks are used for road <br /> watering to control emissions. The mine access road, office area and areas of the shop are paved which <br /> also helps reduce dust emisssons. Appropriate chemicals (MgCQ may be used to control dust in heavy <br /> traffic areas. <br /> Speed is restricted on all unpaved roads within the proposed mine plan area to no more than 40 miles per <br /> hour with the average speed being under 30 miles per hour. Only authorized vehicles are allowed access <br /> to roadways and a system of road closures has been imposed to prevent travel on roads that existed <br /> prior to active mine operations and are not needed to support mining activities. <br /> 4-171 <br />