09-08-25 - City Council Agenda - Laserfiche WebLink

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Ms. Katie Larsen 08/06/2025 Page 5 Nature Refuge North Addition Engineering Review WSB (5/23/2025) Multiple stretches of 12” pipe are shown in the provided storm design sheet, such as those coming from CBs 402A, 404, 415, etc. that must be upsized to 15”. Carlson (6/6/2025) Revised. WSB (6/25/2025) Complete 12. Inlet spread and run calculations, especially at sag points, will be needed to confirm public roads are designed in accordance with City standards of maintaining an 8’ drivable lane during the 3-year storm event. Carlson (4/25/2025) Spread calcs added – based on 3-year event. WSB (5/23/2025) Complete 13. Erosion control blankets must be shown on slopes 4:1 and steeper, such as around proposed basins. Carlson (4/25/2025) Erosion control blanket added where necessary. WSB (5/23/2025) Erosion control blanket is shown in some locations but is missing at other 4:1 slopes. See plan markups. Carlson (6/6/2025) Added. WSB (6/25/2025) Complete 14. WSB (5/23/2025) If overflows exist between wetlands in HydroCAD modeling, they should be identical in both directions. For example, the overflow from W25-B to W25- A is at 905.0, but vice versa the overflow is at 904.7. Carlson (6/6/2025) Revised to 905.0 both directions. Note that this does change flow and HWL very slightly. Numbers updated in all plans. Everything will remain within tolerances. WSB (6/25/2025) Complete 15. WSB (5/23/2025) The outlet pipe for Lake 300 will need a trash guard to minimize the likelihood of clogging the 4” orifice. Carlson (6/6/2025) Trash guards will be added with final plans. See attached draft. (final to be submitted shortly) WSB (6/25/2025) Complete • Water Supply The City’s water supply system well firm capacity should meet or exceed its maximum day demand. This criteria is currently constrained by poor water quality in some wells, the White Bear Lake court orders and ongoing litigation, and annual variability in water use due to drought and other factors. The City’s existing firm capacity (excluding Well No. 2 due to poor water quality) is 4.38 million gallons per day (MGD). The City’s maximum day demand from 2015 to 2024 was 3.87 MGD. Near-term development within the City is projected to increase the maximum day demand by 0.42 MGD, bringing it to 4.29 MGD. The City is actively pursuing Well No. 7 to increase firm capacity, but it will likely not be in service until the fall of 2026. Based on the wide annual variability in maximum day demand and its susceptibility to drought conditions, the City will continue to monitor water demands and reserves the right to impose water restrictions and to reevaluate water supply capacity. The City has begun conversations with the Minnesota Department of Natural Resources (DNR) about permitting Well No. 7 and is awaiting confirmation whether it can be constructed at this time given the ongoing White Bear Lake litigation. Page 111 of 168