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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 EA W Guidelines for a listing) and any greenhouse gases (such as carbon dioxide, methane, nitrous oxide) and ozone-depleting chemicals (chloro-fluorocarbons, hydro fluorocarbons, per fluorocarbons or sulfur hexafluoride), Also describe any proposed pollution prevention techniques and proposed air pollution control devices. Describe the impacts on air quality. The project will involve installation of small, natural gas-fired space heating devices in new buildings. Natural gas-fired space heaters exhaust small amounts of PM, NOx, CO, and He. These space-heating devices are not expected to adversely affect air quality in the area, 24. Odors, noise and dust. Will the project generate odors, noise or dust during construction or during operation? OOYes DNo 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.) The project will not generate significant odors. The proposed development has the potential to generate noise from two types of sources: · Construction activities; · Additional traffic generated by the development. Significant noise impacts occur when: · Noise levels increase by 2: 3 decibels (dBA); · Noise levels exceed state standards. There are two descriptors for state noise standards: · L1 0 - the 90th percentile, in which noise levels are exceeded 10 percent ofthe time. · L50 - the 50th percentile, in which noise levels are exceeded 50 percent of the time. Minnesota noise standards are listed by time of day and land use in the following table. Minnesota Noise Standards Daytime 7 a,m.-l0 p.m, Nighttime 10 p.m.-7 a.m. Land use LIO (dBA) L50 (dBA) LIO (dBA) L50 (dBA) Residential 65 60 55 50 Commercial 70 65 70 65 Industrial 80 75 80 75 Noise impacts from construction of the development may exceed the state noise standards for a limited period oftime. Every effort will be made to reduce construction noise by ensuring that all equipment has proper noise reduction devices. In addition, construction activities will occur only during daytime hours. Environmental Assessment Worksheet Centre Pointe Business Park Page 23 of 29