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WSB Engineering Carwash Noise Impact Assessment David Braslau Associates, Inc. List of Figures Figure 2-1 Proposed Carwash Site Plan ................................................................................. 3 Figure 2-2 Aerial Photo with Superimposed Site Plan ......................................................... 4 Figure 3-1 One-Minute Time History Levels ......................................................................... 6 Figure 3-2 Spot Statistical Sound Spectral Reading ............................................................. 7 Figure 4-1 Assumed Sound Source Spectra for Model Predictions ..................................... 9 Figure 4-2 Sound Level Modeling Geometry ....................................................................... 10 Figure 5-1 Contributing Sound Sources at Receptor A1 .................................................... 12 Figure 6-1 Carwash Spectra at A5 Compared with Background ...................................... 14 Figure 6-2 Carwash Spectrum at A1 with Shielded and Lower Traffic Noise ................. 15 Figure 7-1 A1 Spectrum with Open and Closed Entry Door vs Background .................. 17 Figure 7-2 A1 Vacuum Only Sources with Shielded Background ..................................... 18 Figure 7-3 City Recommended Changes to the Proposed Plan .......................................... 19 Figure 7-4 Limitations of City Proposal ............................................................................... 20 Figure 7-5 Possible Alternative for Shielding Vacuum Noise ............................................ 21 List of Tables Table 1-1 Minnesota Noise Standards (Mn. Rules 7070.0040) ............................................ 1 Table 5-1 Sound Level Model Predictions .......................................................................... 11 66