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<br />Arden Hills 55+ Senior Housing Complex Traffic Noise Assessment <br />David Braslau Associates, Inc. Page 11 <br /> <br />3.0 TRAFFIC NOISE MODEL AND PREDICTIONS <br />3.1. Traffic Noise Model <br /> <br />The MinnNoise traffic noise model, which has shown very good agreement with monitored levels, has <br />been used to predict noise levels associated with vehicle traffic. The traffic noise model geometry with <br />assumed noise receptor sites along the building faces is shown in Figure 3.1. Since the building will <br />provide shielding of noise from the other direction, an assumed barrier in the center of the building <br />ensures that noise from the opposite is shielded. <br /> <br />Also shown in Figure 3.1 are homes to the southwest across Hwy 10 that have raised concerns about the <br />new building increasing traffic noise due to reflections off the building. This issue is addressed in Section <br />4.0 of this report. <br /> <br />Hourly traffic volumes on Highway 10 were based on data from ATR (Automatic Traffic Recorder) <br />10919 which is on Hwy 10 some miles north of the project. The most recent data at this station are from <br />the years 2022 and 2023 and provide realistic traffic volumes for this noise assessment. Increases in <br />traffic of less than 10 percent will have negligible impact on traffic noise levels. <br /> <br />The assumed vehicle mix by direction was based on similar traffic noise studies in the Twin Cities <br />Metropolitan Area - 95% automobiles, 2% medium trucks and 3% heavy trucks. Initially a posted traffic <br />speed of 55 mph was used on both Hwy 10 and TH 96. However, based on sound level monitoring, it <br />was apparent that a traffic speed of 65 mph was more appropriate for traffic noise predictions on Hwy 10. <br />Assumed vehicle mix and hourly volumes are shown in Table 2.1. “MT” are medium (two-axle trucks) <br />while “HT” are heavy (multi-axle trucks). <br /> <br />Table 3.1 Assumed Hourly Volume and Vehicle Mix <br /> <br />TH10 ADT EB WB EB WB <br />Auto 3040 2727 3968 3769 <br />MT 64 57 84 79 <br />HT 96 86 125 119 <br />CR96 ADT EB WB EB WB <br />Auto 1122 1007 1465 1392 <br />MT 23 21 31 29 <br />HT 23 21 31 29 <br />AM PM <br /> <br /> <br /> <br />