07/09/2025 PZ Combined Packet - Laserfiche WebLink

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Ms. Katie Larsen 07/03/2025 Page 3 Peltier Ponds Development - Engineering Review Wetland 10 so undersized dead storage may contribute pollutant loading to the wetland. 10. Please include node summary sheets on future HydroCAD reports so total modeled areas can be confirmed in existing and proposed conditions. 11. The 4.1X and 4X existing conditions HydroCAD subcatchment areas do not match the drainage area map. 12. The culvert modeled as 2XP/2P is a 21” CMP, not 18” RCP. 13. The outlet for 41XP/41P should be modeled with a pipe outlet, not just an orifice. 14. BMP outlet slopes should match between HydroCAD modeling and utility plans (ignoring backsloped skimmer pipes). 15. Based on the modeled results, culvert 2P will overtop Peltier Lake Dr in all storm events. Potential pipe replacement should be explored to minimize road overtopping. 16. What is the purpose of the southern node of Pond 2.6? If it is proposed to be excavated for additional onsite fill, please label it separately as a lake to be consistent with other developments in the City. 17. What is the purpose of the eastern node of Pond 4.1? If it is proposed to be excavated for additional onsite fill, please label it separately as a lake to be consistent with other developments in the City. 18. All proposed pond overflows need riprap stabilization. 19. Erosion control blankets are needed on all slopes 4:1 and steeper, including pond slopes above the OLE. 20. Review tree planting against storm sewer plans to minimize overlap and reduce potential root intrusion on storm sewer. For example, trees near the pipe between CBMH-407 – STMH-406 and CBMH-251 – FES-250 should be shifted farther from the pipe alignment. 21. Tree plantings should be removed from the 60” trunkline easement boundary to avoid potential future maintenance concerns. • 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 prior to Peltier Phases 3 and 4. 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. Applicant to verify water pressure is adequate for all locations within the development. The watermain will need to be looped through the site and will need to include a 12-inch diameter trunk watermain stubbed to the north as identified in the Comprehensive Plan. All proposed units are required to be on the municipal water supply.