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WSB Engineering Carwash Noise Impact Assessment <br />David Braslau Associates, Inc. Page 1 <br />1.0 INTRODUCTION <br />1.1. Study Description <br />This Carwash Noise Impact Assessment presents results of sound level projections at residential <br />receptors adjacent to the proposed Boulevard Autoworks car wash facility in the City of <br />St. Anthony. The projected sound levels are compared with state noise standards for residential <br />land uses and general recommendations presented to bring levels down below the standards. The <br />site is located at 2701 Kenzie Terrace, immediately east of the Kenzington Condominiums. <br />1.2. Study Objectives <br /> <br />The objective of the study is to determine compliance of sound levels with the Minnesota Noise <br />Standards. These standards are presented Table 1.1. The Kenzington Condominiums are <br />adjacent to the site on the west. Walker Methodist housing is located south of the site and single- <br />family homes facing NE 27th Avenue are located north of the site. These all fall under the NAC-1 <br />classification that includes residential land uses. The standards are presented in Table 1.1. <br />Table 1-1 Minnesota Noise Standards (Mn. Rules 7070.0040) <br />Noise Area Classification Daytime Nighttime <br />Noise Metric L50 L10 L50 L10 <br />NAC-1 (residential and sensitive areas) 60 65 50 55 <br /> <br />The L50 refers to levels that occur more than 50% of an hour while the L10 refers to levels that <br />occur more than 10% of an hour. The daytime period includes hours between 7:00 am and 10:00 <br />pm. The nighttime period includes hours between 10:00 pm and 7:00 am. <br /> <br />67