7.1. SR 02-21-2017 - Laserfiche WebLink

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The proposed action will not result in any increase in vehicle-related air emissions. Current truck traffic levels from the existing Tiller facility will continue at approximately the same daily volume and from the same location. Off road vehicles (front end loaders and other earth moving equipment) will operate on the site; however the small number of equipment (typically two loaders operating at the active face) will not generate enough pollutants to have any impact on air quality. The EIS from the Elk River Gravel Mining District addressed vehicle related air emissions. The EIS concluded that emissions of nitrogen oxides and carbon monoxide can result from truck traffic, but such emissions are limited and not considered a potential problem due to the size and the dispersion potential of the area. (Truck traffic movement and equipment operation on and about the facility site does generate PM10 emissions, see #24 below.) 23. Stationary source air emissions. Describe the type, sources, quantities and compositions of any emissions from stationary sources of air emissions such as boilers, exhaust stacks or fugitive dust sources. Include any hazardous air pollutants (consult EAW Guidelines for a listing) and any greenhouse gases (such as carbon dioxide, methane, nitrous oxide) and ozone-depleting chemicals (chloro-fluorocarbons, hydrofluorocarbons, perfluorocarbons or sulfur hexafluoride). Also describe any proposed pollution prevention techniques and proposed air pollution control devices. Describe the impacts on air quality. Vehicles operating within the site on internal haul roads are the primary source of dust generation. Additional dust may be generated at the mining face from loader operations, the primary crusher, and transporting material from the active mining face to the processing area. Mitigation measures include frequent road watering. A water truck is kept at the existing Tiller site and is readily available for dust control that includes watering internal haul roads on a daily basis. Conveyors will be used to transport the material from the active mine face to the processing area, reducing dust emissions associated with internal truck traffic. In addition, the entire entrance area into the processing and stockpile area, as well as the majority of the stockpile area, is paved. Maintaining existing trees within the mining setback areas also reduces overall dust emissions from the site. 24. Odors, noise and dust. Will the project generate odors, noise or dust during construction or during operation? _X_Yes __No If yes, describe sources, characteristics, duration, quantities or intensity and any proposed measures to mitigate adverse impacts. Also identify locations of nearby sensitive receptors and estimate impacts on them. Discuss potential impacts on human health or quality of life. (Note: fugitive dust generated by operations may be discussed at item 23 instead of here.) This project is not expected to generate any odors. Dust emissions are discussed in item #23 above. The operation of equipment associated with stripping topsoil and extraction, crushing and transport of aggregate will generate noise. Mining and processing will be subject to setbacks established by the City of Elk River Mining Ordinance and voluntary setbacks shown on the plan. The setbacks will help to minimize the impact of noise on nearby residents. The site will comply with the State of Minnesota Noise Standards. The standards establish allowable noise levels measured at nearby residences. The noise standards are given below: MINNESOTA NOISE STANDRADS FOR RESIDENTIAL AREAS Daytime Nighttime L50 L10 L50 L10 60 dBA 65 dBA 50 dBA 55 dBA The Minnesota Standards define daytime hours as 7:00 a.m. to 10:00 p.m. and nighttime hours from 10:00 p.m. to 7:00 a.m. Hours of operation for the site are proposed to be consistent with the existing