Agenda - Public Works Committee - 03/19/2024

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&M,Nop[a.Real Solutii ll. . 126 (,'1 3) 1 Fa 1,7 11,2 ,M Biol,ton Me,ri June 25, 2019 RE: Technical Memorandum 2019 Municipal Plaza and Center Street Concept Stormwater Reuse City of Ramsey, MN Bolton&Menk. Inc has completed a preliminary study that analyzes the feasibility of integrating stormwater reuse for irrigation of the proposed Municipal Plaza in conjunction with Center Street Improvements. The reuse system envisioned will include best management practices to collect and treat runoff, storage tanks to store the runoff, and a pump station and piping to convey the reuse water to the irrigation areas. The pump station will include pumps, a control system to monitor flow and pressure, and a treatment unit and self-flushing filter to protect the public from potential pathogens in the stormwater. The site analyzed for the stormwater reuse system includes Center Street Northwest from East Ramsey Parkway to Sunwood Drive Northwest. Current Conditions The COR Area of Ramsey is under active development. Since its inception,regional stormwater management has been constructed to maintain stormwater discharge rates to the undeveloped condition and provide water quality and volume control to meet state and local standards. Therefore, the development area surrounding Center Street was planned to discharge into a trunk storm sewer system, sized for the 100-year storm (7.1"in 24 hours)to the regional collection system. The area surrounding Center Street NW is largely undeveloped, but is proposed to include commercial businesses including the Affinity at Ramsey building,which is currently under construction near the Southwest quadrant of Center Street NW and E Ramsey Parkway. Affinity at Ramsey is responsible for their own stormwater requirements and none of their site was considered for collection in the stormwater reuse system. Additional multi-family residential and mixed-use facilities will also be constructed adjacent to the corridor, also assumed to discharge into the Center Street trunk storm sewer independent of the proposed Center Street treatment and stormwater reuse system. Center Street NW is currently paved with concrete curb and gutter on each side. Each side of the road includes a driving lane and a parking lane. A 10' path runs along the west side of the road. Drainage patterns run from north to south and stormwater runoff is currently captured by catch basins that route the water offsite to the south. Proposed Conditions Municipal Plaza is a proposed 1.7-acre green space accessible to the public. Municipal Plaza will be located on the west side of Center Street NW from E Ramsey Parkway to Sunwood Drive NW. The east side of Center Street NW is proposed commercial/residential buildings. The site resides in the City's moderate vulnerability Drinking Water Supply Management Area(DWSMA) and the emergency response area. Therefore, traditional infiltration practices are prohibited.