Agenda - Council - 09/22/2020 - Laserfiche WebLink

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I. Project Description Platinum Land, LLC is proposing a residential development in Ramsey, Minnesota. The proposed project location includes multifamily residences on lot locations adjacent to Nowthen Boulevard NW near its intersection with 146th Avenue. The proposed project location and layout is shown in Figure 1. The areas for outdoor use for this proposed development are on the south side of the proposed buildings. As such the proposed buildings act as barriers and mitigate noise impacts to these areas. Because of the potential noise impacts from Nowthen Boulevard NW traffic, the City of Ramsey has requested a noise study to evaluate the proposed project relative to Minnesota Noise Standards. 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 Lio L50 L10 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.