8.2. SR 11-07-2016 - Laserfiche WebLink

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Vehicle related air emissions include carbon monoxide, hydrocarbons, NOX, particulate matter and sulfur dioxide from employee automobiles, trucks, and excavation equipment such as loaders and back hoes. The Site is not expected to have an adverse impact on air quality. c. Dust and odors - Describe sources, characteristics, duration, quantities, and intensity of dust and odors generated during project construction and operation. (Fugitive dust may be discussed under item 16a). Discuss the effect of dust and odors in the vicinity of the project including nearby sensitive receptors and quality of life. Identify measures that will be taken to minimize or mitigate the effects of dust and odors. Fugitive dust is discussed under item 16a. The proposed mining and processing operations will not create odors. 17. Noise Describe sources, characteristics, duration, quantities, and intensity of noise generated during project construction and operation. Discuss the effect of noise in the vicinity of the project including 1) existing noise levels/sources in the area, 2) nearby sensitive receptors, 3) conformance to state noise standards, and 4) quality of life. Identify measures that will be taken to minimize or mitigate the effects of noise. The operation of equipment associated with stripping topsoil and extraction, crushing and transport of aggregate will generate noise. Site operations will be subject to the Minnesota state noise standards. State standards have been established for daytime hours, defined as 7:00 a.m. to 10:00 p.m. and night time hours defined as 10:00 p.m. to 7:00 a.m. Nighttime standards are more restrictive than daytime standards. The project is proposing 24 hour operations and will therefore be subject to both daytime and nighttime standards. Noise standards are applicable at the receptor location and depend upon the type of receptor. Residential receptors are classified as NAC1 which includes farmsteads and rural residential land uses. NAC1 is the most restrictive noise area classification. Very generally, NAC2, NAC3 and NAC 4 are applicable to commercial, industrial and undeveloped land respectively. The rules establish acceptable noise levels for both the L50, the sound level that must not be exceeded for more than 50% of any given hour (30 minutes) and the L10, the sound level that must not be exceeded for more than 10% of any given hour (6 minutes) at the receptor location. Noise levels are expressed in decibels A-weighted (dBA). This is a measure of the relative loudness of sounds in air that are weighted to account for human perception of sound at various frequencies. Table 24-1 presents the applicable state noise standards. Environmental Assessment Worksheet Page 24 Elk River Sand and Gravel Mines:Tiller Corporation and Max Steininger, Inc.