08/26/2020 EB Packet - Laserfiche WebLink

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3 Storm Water Management, Erosion and Sediment Control Storm water on the site heads south to Amelia Lake through private ditches. Storm water management plan will have to be submitted. Given the soil types and location in a highly vulnerable section of the Drinking Water Supply Management Area (DWSMA), infiltration will probably not be feasible. Stormwater Pollution Prevention Plan (SWPPP) The project will require an NPDES permit and SWPPP. Flood Plain Site falls within the flood management zone. Flood zone should not encroach into lots if feasible. Wetlands Per the Sambatek concept layout, there are 34.61 acres of wetlands on site. A wetland delineation will be required. Vadnais Lake Area Water Management Organization (VLAWMO) is the Local Government Unit (LGU) responsible for administering the Wetland Conservation Act (WCA). VLAWMO will provide decisions regarding any wetland impacts that are proposed to occur during the course of the development. The wetlands are considered high priority in the Resource Management Plan. This project should include wetland buffers of 50 feet on average with a 25 foot minimum. There may be opportunities to restore hydrology on the site by minimizing runoff to the private ditch. Restoration of native plant communities could be conducted in conjunction with restoration of hydrology. Alternative Urban Areawide Review (AUAR) Considerations The northeast portion of the site containing the senior housing building falls within the AUAR boundary. This area was planned for residential in all three land use scenarios described in the 2020 AUAR update. Drinking Water Protection The site is within the Drinking Water Supply Management Area (DWSMA) and is highly vulnerable. This will impact how storm water is managed on the site, particularly through limiting infiltration. Also, any existing private wells should be sealed and abandoned per Department of Health requirements.