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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 4 of 4 <br /> <br />Table 2 – Sound Level Measurements <br />Measurement Location LAeq <br />(1) At dryers inside carwash 104 dBA <br />(2) Near exit inside carwash (32’ from dryers) 102 dBA <br />(3) Directly outside carwash (5’ from carwash exit) 94 dBA <br />(4) 50’ from dryers outside carwash 90 dBA <br />(5) At property line (48’ from carwash exit) 81 dBA <br />(6) At property line (115’ from carwash exit) 73 dBA <br />(7) At property line (77’ from carwash exit) 67 dBA <br /> <br />Table 3 – Sound Level Measurements with Dryers Off vs Dryers On <br />Measurement Location LAeq (Dryers Off) LAeq (Dryers On) <br />(3) Directly outside carwash (5’ from carwash exit) 73 dBA 94 dBA <br />(6) At property line (115’ from carwash exit) 68 dBA 73 dBA <br /> <br />Conclusion <br />Noise levels generated by an existing Rocket Car Wash were measured in order to estimate noise levels at a <br />proposed location in Grimes, IA. Please reach out if you have any questions or concerns regarding the results in <br />this report. <br /> <br />JME <br />