05/29/2001 Council Packet - Laserfiche WebLink

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• • • Noise A noise impact analysis was completed as part of the Indirect Source Permit (ISP) application for this project. The ISP is provided in Exhibit H. The project has the potential to generate noise from four types of sources: 1. construction activities, 2. additional traffic generated by the project, 3. loading dock trucks, and 4. roof -top fans. 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: NAC -1 (Residential) NAC -2 (Commercial) NAC -3 (Industrial) 7:00 AM to 10:00 PM 10:00 PM to 7:00 AM L10 L50 65 60 70 65 80 75 L10 Lso 55 50 70 65 80 75 L10 means the sound level which is exceeded for 10 percent of the time for a one -hour period. Lso 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. Minnesota Statutes, Section 116.07, Subd. 2a, exempt noise from most local and county roads from the requirements of these noise rules unless full control of access to the road has been acquired. Construction Noise Construction noise will be controlled by ensuring that all equipment has proper noise reduction devices. In addition, construction activities will occur only during daytime hours, as required by City of Lino Lakes Ordinance 04 -96 that specifies hour of operation from lam to 8pm (weekdays) and gam to 7pm (weekends and holidays). Traffic Noise - I -35W Noise The small relative amount of traffic increase on I -35W due to this project will not result in a measurable change in noise generated from the highway. Homes along 77th Street where I -35W is the major noise source, will see some reduction in noise levels from the interstate due to the barrier effect of the project buildings. SBP used the traffic -noise model Minnoise to determine the potential effect of these buildings on noise levels along 77th Street. The analysis predicted a 1 -2 dBA reduction in I -35W traffic noise at residential locations near 77th Street due to the barrier effect of the project buildings. The following table shows the results of the Minnoise modeling for the two modeled 77th Street receptors: Receptor R1 R2 Modeled Noise Levels for 77`" Street Receptors Without Development L10 Lso 59.5 dBA 57.3 dBA 58.0 dBA 55.9 dBA With Development L10 L50 58.0 dBA 55.7 dBA 56.9 dBA 54.7 dBA Difference due to Development L10 L50 -1.5 dBA -1.6 dBA -1.1 dBA -1.2 dBA Page 23 of 28 Draft EAW Lino Lakes Marketplace May 11, 2001