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K:\017658-000\Admin\Docs\Memo - JMessner - GHG Analysis - DRAFT.docx540 GATEWAY BLVD | BURNSVILLE, MN | 55337 | 952.737.4660 | WSBENG.COMMemorandum To: Justin Messner, WSB From: Alison Harwood, WSB Date: March 1, 2021 Re: Boulevard Auto Car Wash – Greenhouse Gas Analysis WSB Project No. 17658-000 On behalf of the City of Saint Anthony Village, WSB conducted a qualitative analysis of greenhouse gas (GHG) emission potential from the proposed Boulevard Auto Car Wash. The proposed project is located in Hennepin County (Major Watershed 20), an area that has seen a general increase in both average temperature (0.23° F/decade) and rainfall (0.30”/decade) over the past century. The proposed project would result in approximately 3,760 square feet of impervious surface. No trees are present on the site, so tree removal will not occur, but the project will convert the existing turfgrass vegetation to impervious surface. City storm and sanitary sewer systems will provide stormwater and wastewater management, respectively, for the project. Construction of the project is anticipated to begin in Summer 2021. Upon construction, the car wash will operate between 8:30 am – 5:00 pm. In terms of GHGs, the types of emissions likely to be of concern include those produced by mobile source fossil fuels (i.e., gasoline). The sum of GHG emissions for gasoline is reported in carbon dioxide equivalents (CO2-e). Based on data gathered from the US Department of Energy, the typical passenger vehicle burns between 0.16 and 0.84 gallons of gasoline/hour. The US Environmental Protection Agency (EPA) estimates that 1 gallon of gas creates 19.6 pounds of CO2-e. During operation, we assume 450 vehicles/day on average will utilize the car wash. Based on that, the potential fuel consumption output would be approximately 72 – 378 gal/day. This equates to approximately 0.7 – 3.7 tons of CO2-e/day (256 – 1351 tons CO2-e/year). This assumes that the car wash is operating every day of the year, which is unlikely. If a proposed project is expected to produce less than 100,000 tons CO2-e/year of GHGs, the Minnesota Pollution Control Agency views the GHG emissions as not significant. Because this project falls well below that threshold, the environmental impact to air quality is expected to be insignificant. To reduce GHG emissions, the following recommendations are provided: Require vehicles using the vacuums turn off their engines Require vehicles inside the car wash turn off their engines Post signage recommending vehicles waiting to enter the wash turn off their engines If you have any questions related to this analysis, please contact me at aharwood@wsbeng.com or 763-231-4847. 89