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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 1 of 4 <br /> <br />Summary <br />The proposed project consists of the construction of a Rocket Car Wash located at 200 NE Destination Drive in <br />Grimes, Iowa. The City of Grimes requested a sound study be conducted to ensure noise levels do not <br />significantly impact surrounding properties. <br />IP Design Group conducted noise level measurements at an existing Rocket Car Wash in Elkhorn, NE on April 27, <br />2022. The results from these measurements are included in this report and will be used to estimate noise levels <br />of the proposed car wash. <br />Background <br />Noise is often described as unwanted sound and sound is defined as any pressure variation in air that is detected <br />by the human ear. Sound pressure level is measured in decibels (dB) which is the log squared ratio of the <br />pressure disturbance to a reference disturbance multiplied by ten. Table 1 shows common noise levels <br />associated with various sources. <br />Table 1 – Typical Sound Levels <br />Sound Pressure Level (dB) Common Indoor and Outdoor Noises <br />130 Threshold of pain <br />120 Near a jet aircraft at takeoff <br />110 Riveting machine <br />100 Construction Site <br />90 Boiler Room <br />80 Shouting at 3ft <br />70 Vacuum cleaner <br />60 Conversational speech at 3ft <br />50 Quiet urban area during daytime <br />40 Quiet urban area at night <br />30 Quiet suburban area at night <br />20 Quiet countryside <br />10 Human breathing <br />0 Threshold of audibility <br /> <br /> Attachment J