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<br />Noise and Air Quality Analysis <br />Centerville EA W <br /> <br />1.0 INTRODUCTION <br /> <br />This report evaluates the air quality and noise impacts related to the proposed <br />development of the downtown area in Centerville, Minnesota. New buildings will be a <br />mix of retail or commercial and multifamily housing. Retail and commercial space will <br />be available on the first floor of buildings along Main Street and Centerville Road with <br />condo style homes above. Surrounding blocks will be filled with townhomes. The <br />proposed redevelopment is shown in Figure 1. <br /> <br />2.0 NOISE IMPACT ANALYSIS <br /> <br />SBP has conducted a traffic noise monitoring and modeling analysis for the proposed <br />development. The modeling analysis used the MNDOT Minnoise computer model and <br />traffic predictions prepared by Bonestroo. Additionally, SBP conducted noise monitoring <br />at two locations near the project site. <br /> <br />2.1 Minnesota Noise Standards <br /> <br />Minnesota Rules Chapter 7030 provide the Minnesota standards for noise. These <br />standards describe the limiting levels of sound established on the basis of present <br />knowledge for the preservation of health and welfare. These standards are designed to be <br />consistent with sleep, speech, annoyance, and hearing conservation requirements for <br />receivers within areas grouped according to land use activities. The Minnesota standards <br />are as follows: <br /> <br /> 7 :00 AM to 10:00 PM 10:00 PM to 7:00 AM <br /> LIO Lso LIO Lso <br />NAC-l (Residential) 65 60 55 50 <br />NAC-2 (Commercial) 70 65 70 65 <br />NAC-3 (Industrial) 80 75 80 75 <br /> <br />LIO means the sound level which is exceeded for 10 percent of the time for a one-hour <br />period. Lso means the sound level that is exceeded 50 percent of the time for a one-hour <br />period. Sound levels are expressed in dBA. A dBA is a unit of sound level expressed in <br />decibels and weighted for the purpose of approximating the human response to sound. <br /> <br />Minnesota Statutes, Section 116.07, Subd. 2a, exempt noise from local and county roads <br />from the requirements of these noise rules unless full control of access to the road has <br /> <br />Page :2 <br />