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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 2 of 4 <br /> <br />Measurement Procedure <br />Sound level measurements were taken at 7 locations in and around the Rocket Car Wash, including directly next <br />to the dryers, 50’ away and at three separate property line locations. See Figure 1 for measurement locations. <br />Two measurements were taken at each location and then averaged. The city of Grimes indicated concern with <br />the noise level of the dryers so measurements were taken while the dryers were in use. Photos of the dryers are <br />shown in Figure 2 below. The dryers operate only when a vehicle is going through the car wash and the drying <br />time is about 35 seconds. Ambient noise level measurements were also taken at two locations while the dryers <br />were not in use. <br />Figure 1 – Measurement Locations <br /> <br /> <br />