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WSB Engineering Carwash Noise Impact Assessment <br />David Braslau Associates, Inc. Page 18 <br /> <br />Figure 7-2 A1 Vacuum Only Sources with Shielded Background <br />0 <br />10 <br />20 <br />30 <br />40 <br />50 <br />60 <br />70 <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 />Vacuum Spectra at A1 vs Background <br />Vac1 <br />Vac4 <br />Vac7 <br />Background (L90) <br />Shielded L50 <br />3 vac <br />6 vac <br />84