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178 E 9TH STREET | SUITE 200 | SAINT PAUL, MN | 55101 | 651.286.8450 | WSBENG.COMMemorandum <br />To: Charlie Yunker – St. Anthony Village City Manager <br />From: Justin Messner, PE – St. Anthony Village City Engineer <br />Cc: Steve Grittman – St. Anthony Village City Planner <br />Nicole Miller – St. Antony Village City Clerk <br />Date: March 1, 2021 <br />Re: Boulevard Autoworks Carwash – Environmental Review <br />WSB Project No. 017658-000 <br />Attached for your review are three memos detailing our review and analysis of the proposed <br />Boulevard Autoworks Carwash facility specifically the environmental impact of water resource <br />(surface water runoff), noise, and air quality. The following is summary of the review and findings <br />found in each of the memos. <br />Water Resource <br />As with any proposed development in the City; rate control, flood control, volume control, and <br />water quality standards will need to conform to the rules and regulations set forth by the City’s <br />Water Resource Plan (WRMP), the Mississippi Watershed Management Organization (MWMO), <br />and the Minnesota Pollution Control Agency (MPCA). <br />Rate Control: The preliminary grading plan prepared by Alliant Engineering dated 11/20/20 <br />indicates a proposed filtration rain garden to be constructed at the NE corner of the site. The <br />filtration rain garden appears to provide a location for the necessary rate control however the <br />applicant will be required to submit storm sewer design calculations for review prior to final <br />approval. <br />Flood Control: The proposed building elevation meets the freeboard requirements set by the <br />WRMP. <br />Volume Control: The project site is 0.81 acres and so the total disturbed area is not <br />anticipated to exceed 1 acre, therefore, no permanent stormwater management is required <br />per MWMO’s rules and therefore no volume control or alternative sequencing is required. <br />Water Quality: The above-mentioned filtration rain garden appears to provide a location for <br />the necessary pretreatment of runoff leaving the site however the applicant will be required to <br />submit water quality design calculations for review prior to final approval. <br />Noise <br />A noise impact analysis was conducted by David Braslau Associates, Inc to review the potential <br />sound levels associated with the proposed project and its impact on adjacent residential property. <br />Sound monitoring was performed at an existing carwash of similar design to capture <br />representative sound levels. <br />59