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WSB Engineering Carwash Noise Impact Assessment <br />David Braslau Associates, Inc. <br /> <br /> <br />EXECUTIVE SUMMARY <br /> <br /> <br />The proposed Boulevard Autoworks carwash facility in St. Anthony, Minnesota, will be <br />located on Kenzie Terrace just east of the Kenzington Condominiums. The carwash <br />building will be oriented east west with the entrance on the west closest to Kenzington <br />and the exit on the east facing the roadway and commercial land uses. <br /> <br />This report addresses potential sound levels associated with the carwash and how these <br />could impact adjacent residential land uses. Sound levels are compared with Minnesota <br />state noise standards and found to exceed the daytime L50 noise standard for the adjacent <br />Kenzington residences and several homes along NE 27th Avenue. <br /> <br />Background and traffic sound levels were monitored on a Friday afternoon and found to <br />comply with state noise standards. Carwash sound levels were also compared with the <br />background and found to have a potential significant impact. <br /> <br />Mitigation to meet state noise standards is recommended to keep the entry and exit doors <br />closed when power washing and final drying of vehicles. This will bring carwash levels <br />below the state L50 daytime noise standard. <br /> <br />However, this would not address noise from vacuum units which are outside of the <br />building Mitigation of vacuum noise by shielding the area was recommended by the city <br />of St. Anthony but would likely not shield all Kenzington units from sound. An alternate <br />method to mitigate vacuum noise would enclose only the motors and leave hoses outside <br />of the enclosure. <br /> <br /> <br /> <br />64