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Arden Hills 55+ Senior Housing Complex Traffic Noise Assessment <br />David Braslau Associates, Inc. Page 6 <br /> <br />2.0 TRAFFIC NOISE MONITORING <br /> <br />Traffic noise levels were monitored during the PM Peak period (4-5 pm) on Wednesday, September 4, <br />2024 and during the AM “peak nighttime” period from 6-7 am on Thursday, September 5, 2024. Monitor <br />locations are shown on Figure 2.1. The purpose for monitoring at these sites was to capture noise from <br />free-flowing traffic at a known distance from the nearest travel lane for calibration of the noise prediction <br />model used to evaluate levels at the proposed new building. <br /> <br />Peak hour traffic volume on major roadways is normally measured during the 4 to 5 pm hour with free- <br />flowing traffic. However, during the monitoring period there were considerable variations in traffic speed <br />due to the interchanges of Hwy 10 with Interstate 35 to the northwest and Interstate 494 to the southeast. <br />This caused considerable congestion, with highly varying sound level as can be seen in Figure 2.2. <br />However, for purpose of modeling free-flow noise, an assumed free flowing traffic sound level of 74 dBA <br />at the monitor has been assumed for calibrating the noise prediction model for the PM period. <br /> <br />Traffic noise levels along TH 96 appeared to flow more smoothly without significant changes in speed. <br /> <br />Monitored hourly statistical sound levels along Hwy 10 and TH 96 are presented in Table 2.1. <br /> <br />