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North Dayton Development AUAR <br />measures and the ability of the facility to handle the added water and waste loadings, including <br />any effects on, or required expansion of, municipal wastewater infrastructure. <br />2) If the wastewater discharge is to a subsurface sewage treatment systems (SSTS), describe the <br />system used, the design flow, and suitability of site conditions for such a system. <br />3) If the wastewater discharge is to surface water, identify the wastewater treatment methods and <br />identify discharge points and proposed effluent limitations to mitigate impacts. Discuss any <br />effects to surface or groundwater from wastewater discharges. <br />The project site is currently included within the 2030 MUSA Boundary. The study area is in the <br />NE Dayton service area and sewer flows from this site will be routed to the Metropolitan Council <br />Metro Wastewater Treatment Plant which is capable of treating all estimated flows produced by <br />this development (see Figure 14). Based on the location of the existing sanitary sewer lines, an <br />extension of the system will be necessary to bring service to the site. The City of Dayton <br />Comprehensive Plan includes proposed trunk sanitary sewer and force main coverage for this <br />project area (see Figure 15). Wastewater discharge from the development would be domestic <br />wastewater. The estimated volumes for the development shown below vary based on number of <br />residential homes. Volumes are estimated based on the Metropolitan Council Environmental <br />Services Service Availability Charge (SAC) Procedure Manual dated January 2017. One sac per <br />274 gallons per day. The receiving water body from the Metropolitan Wastewater Treatment <br />Plant is the Mississippi River. <br />Use Building SAC Unit <br />SF Equivalent <br />Rate SAC GPD GPM Peak Peak <br />(Unit/SAC) GPM CFS <br />Residential NA <br />Residential NA <br />1500 Each 1 <br />1700 Each 1 <br />1500 411,000 381 1142 2.54 <br />1700 465,800 431 1294 2.88 <br />Based on SAC guidelines, daily maximum wastewater generated by the proposed development <br />will vary between 411,000 and 465,800 gallons per day based on the number of residential <br />homes. At a peaking factor of 3, the proposed development is expected to generate a peak <br />wastewater flow of 1,233,000 to 1,397,400 gallons per day. <br />The Metropolitan Council's Metropolitan Wastewater Treatment Plant, located in St. Paul, has <br />experienced an average wet weather design flow of 314 mgd with an average daily influent of <br />131.35 mgd from November of 2016 to November of 2017. The facility is capable of treating the <br />volume and composition of wastewater projected to be generated by the development without <br />pretreatment or other plant facility improvements. The receiving waterbody from the <br />Metropolitan Wastewater Treatment Plant is the Mississippi River. <br />The southwest portion of the project area is outside the 2020 staging of the 2030 Comprehensive <br />Plan Update. The City of Dayton will need to revise the 2020 staging to include this portion of <br />the project either through a comprehensive plan amendment or incorporation within the 2040 <br />Comprehensive Plan Update. <br />21 <br />