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Arden Hills 55+ Senior Housing Complex Traffic Noise Assessment EXECUTIVE SUMMARY This Traffic Noise Assessment addresses expected noise levels at the proposed Arden Hills 55+ Senior Housing Complex in Arden Hills, Minnesota, and proposed measures to comply with Minnesota Noise Standards. The project is located between Minnesota Highway 10 (Hwy 10) on the south and Trunk Highway 96 (TH 96) on the north. The purpose of this study is to determine if the project is in compliance with Minnesota state noise standards, or if needed, to meet exceptions to the rules in the Minnesota Noise Standards. Traffic noise levels from Hwy 10 and TH 96 have been predicted for representative second floor receptor sites distributed around the project building for the morning peak hour (6-7 am) and afternoon peak hour (4-5 pm). Daily traffic volumes have been collected from the MnDOT Traffic Mapping Application and directional and hourly traffic volumes have been based on data from Automatic Traffic Recorder 10919 located on Hwy 10 north of the project. Vehicle type percentages have been based on similar studies in the Twin Cities Metropolitan Area. Under Minnesota noise rule definitions, the hour from 6 -7 AM falls under the nighttime category while the 4-5 PM hour falls under the daytime category. The MinnNoise computer model has been used to estimate nighttime (6-7 AM) and daytime (4-5 PM) sound levels at selected receptors sites distributed around the proposed building. Due to proximity of roadways, the predicted nighttime L10 and L50 levels at all receptor sites are above daytime and nighttime standards for residential land use but can be brought into compliance with state rules if appropriate STC rated windows are installed. Under exceptions to the rules, the STC rating needed for windows and doors with direct exposure to highway noise will depend upon the area percentages of exterior wall components. Depending on glazing area, STC28, STC29 and STC30 windows would be needed to comply with exceptions to the rules. If different glazing types would be difficult, STC30 glazing would be needed throughout. The final section of the study addresses potential increases in traffic noise level for homes to the southwest across TH 10 due to possible reflection from the new building. The latest FHWA traffic noise model (TNM 3.2) is now capable of evaluating traffic noise reflections from structures. While not publicly available, the consulting firm Bowlby Associates offered to perform an analysis. Results of the analysis show increases from zero to well below 1 dBA, that would not be easily detectable.