Agenda - Council - 06/13/2017 - Laserfiche WebLink

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I. Project Description Riverstone Development, LLC is proposing a residential development in Ramsey, Minnesota. The proposed project location is bordered on the south by Minnesota Highway 10 (TH 10) and a Burlington Northern railroad track. The proposed project location and layout is shown in Figure 1. Because of the potential noise impacts from TH 10 traffic, the City of Ramsey has requested a noise study to evaluate the proposed project relative to Minnesota Noise Standards. The project is proposing a berm between the residential area and the highway and railroad. II. Minnesota Noise Standards Minnesota Rules Chapter 7030 provide the Minnesota standards for noise. These standards describe the limiting levels of sound established on the basis of present knowledge for the preservation of health and welfare. These standards are designed to be consistent with sleep, speech, annoyance, and hearing conservation requirements for receivers within areas grouped according to land use activities. The Minnesota standards are as follows: 7:00 AM to 10:00 PM 10:00 PM to 7:00 AM L i o L50 L 10 L50 NAC-1 (Residential) 65 60 55 50 NAC-2 (Commercial) 70 65 70 65 NAC-3 (Industrial) 80 75 80 75 Lio means the sound level which is exceeded for 10 percent of the time for a one -hour period. L50 means the sound level which is exceeded 50 percent of the time for a one -hour period. Sound levels are expressed in dBA. A dBA is a unit of sound level expressed in decibels and weighted for the purpose of determining the human response to sound. The nighttime NAC-1 standards are designed to prevent sleep interference for people sleeping in bedrooms with partially open windows. NAC-2 nighttime standards apply to NAC-1 locations if the building is constructed in such a way that the exterior to interior sound level attenuation is at least 30 dBA and the building has year-round climate control. Buildings meeting the State building code requirements typically meet the 30 dBA exterior to interior sound level attenuation requirement. The NAC-1 daytime standards are designed to prevent speech interference in areas for outdoor activities. Areas for outdoor activities are not allowed if these noise levels are exceeded.