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<br />Sound Study Results <br />Rocket Car Wash – Grimes, IA <br />April 2022 <br /> <br /> <br />IPDG No. 2022 9275 Page 3 of 4 <br /> <br />Figure 2 – Car Wash Dryers <br /> <br /> <br />Measurement Results <br />Measurements were taken at 2:15pm on a Wednesday afternoon. The weather was cloudy with an air <br />temperature of 78° and 14 MPH winds. A number of vehicles were observed going through the car wash at this <br />time. The type of vehicle did not have any impact on level of sound or spectra of the sound coming from the <br />dryers. Sound level measurement results are reported in Table 2 below. Table 3 shows ambient noise level <br />measurements with dryers off versus sound level measurements with dryers on. <br /> <br /> <br /> <br />