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Memorandum To: Ashley Morello, St. Anthony Village Assistant City Manager From: Bill Alms, PE, Water Resources Project Manager Katie Koscielak, Municipal Project Manager Henry Meeker, Water Resources Graduate Engineer Date: April 3, 2025 Re: Impervious Cover Variance – Able View Assisted Living – 0 Foss Rd WSB has reviewed Land Use Application #9555 for the Able View Assisted Living site dated February 2, 2025. The existing site is undeveloped, with the majority of runoff flowing northeast to an existing regional pond. There are existing City storm sewer pipes running west to east across the north end of the site and south to north across the east end of the site. The proposed site includes a two-story building, parking lot, and biofiltration basin. Due to the unique nature of the site, a variance to the City impervious cover limits appears to be justified. The narrow parcel, further encumbered by existing storm sewer, limits possible site layouts. The proposed site maximizes tributary flows into a BMP to provide water quality treatment and rate control. Beyond stormwater management, this biofiltration basin will provide aesthetic enhancements and habitat improvements to the site. The proposed native seeding mix will provide an important landscape space for pollinators and other wildlife in a region of the City otherwise dominated by turfgrass. With the proposed additional imperious, the developer must continue to demonstrate that water quality treatment and rate control is provided in accordance with City and Rice Creek Watershed District requirements; it is likely that the proposed biofiltration basin will require some redesign to accommodate more impervious surface. Additionally, it is recommended that the developer maximize native landscaping across the site and propose trees above the required minimum to help offset the loss of natural space with increased impervious. 131