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WSB Engineering Carwash Noise Impact Assessment <br />David Braslau Associates, Inc. Page 9 <br /> <br />Figure 4-1 Assumed Sound Source Spectra for Model Predictions <br /> <br />0 <br />10 <br />20 <br />30 <br />40 <br />50 <br />60 <br />70 <br />80 <br />90 <br />32 Hz 63 Hz 125 Hz 250 Hz 500 Hz 1k Hz 2k Hz 4k Hz 8k Hz 16k HzSound Level (dB)Frequency <br />Assumed Source Spectra (50 ft) <br />Entry <br />Washing <br />Exit Dryer <br />75