01-06-25 - Council Work Session Agenda

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Ms. Katie Larsen 12/04/2024 Page 2 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. Based on the water supply capacity and well trigger analysis completed in April 2024, excluding Well No. 2 due to poor water quality, if the City is able to add Well No. 7 then the system could serve approximately 7,300 households (about 1,400 households more than the existing 5,900 households) before Well No. 8 is needed. The final number of available households will need to be determined as the project progresses. 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. Water infrastructure for the Peltier Ponds Addition has not yet been designed and will need to be submitted for preliminary plat by the applicant. It is anticipated that the existing 12" DIP trunk main on Watermark Way will need to be extended west through the development northern boundary similar to what is shown in the City's 2040 Comprehensive Plan. A 12" stub will need to be extended to the north towards Rehbein's Peltier View. Otherwise, the development will include a water system with predominately 8- inch diameter ductile iron pipe (DIP) water main with 1-inch Type K copper services being extended to each lot. Water supply will need to be evaluated in conjunction with current pending DNR water appropriation approvals. Additional water stubs will be extended to the south. The south portion of the development is in the City's Drinking Water Study Management Area and would be subject to those requirements. • Sanitary Sewer Sanitary sewer collection for the Peltier Ponds Development has not yet been proposed and will need to be submitted for preliminary plat by the applicant. It is anticipated that the existing 10- inch diameter poly -vinyl chloride (PVC) trunk main on Watermark Way will be extended west to serve the proposed addition. The remainder of the addition will need to be evaluated by the applicant as to whether a lift station as shown in the City's 2040 Comprehensive Plan is necessary. If necessary, the lift station will need to be oversized to accommodate the remaining sanitary sewer district 3H. Oversizing costs for the lift station will be credited by the City. The site will otherwise be served by 8- inch diameter main along with 4-inch Schedule 40 PVC service pipe to each lot. Additional sanitary sewer stubs will be extended to the north and south. Peltier Ponds Development - Engineering Review