03-03-25 - Council Work Session Agenda

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Ms. Katie Larsen 02/05/2025 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. All proposed units are required to be on the municipal water supply. Water infrastructure for the Burque Estates Addition has not yet been designed and will need to be submitted for preliminary plat by the applicant. There is an existing 16-inch diameter trunk watermain within Cypress St that will need to be looped to the existing 16- inch diameter trunk watermain at Birch St. A 12-inch diameter watermain will need to be extended south through the property or along 20th Avenue. It should then loop back to the existing 8-inch diameter watermain within Chestnut St. 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. An additional 12" water stub will need to be extended to the south for future development. The development is in the City's Drinking Water Study Management Area and has high vulnerability and would be subject to those requirements. Sanitary Sewer Sanitary sewer collection for the Burque Estates development has not yet been proposed and will need to be submitted for preliminary plat by the applicant. It is anticipated that the existing 8-inch polyvinyl chloride (PVC) sanitary sewer within Cypress St that will need to be extended south to serve the south portion of the site. The sanitary sewer at Chestnut St is not deep enough to serve the south portion site. We recommend that the City consider project phasing such that the utilities are extended to the south with the first phase. The addition will need to be evaluated by the applicant as to whether the existing lift station will need to be oversized to accommodate the proposed development and the remaining sanitary sewer district 3C. Oversizing costs for the remaining sanitary sewer district 3C will be credited by the City. The site will otherwise be served by 8- inch Burque Estates Concept Plan Submittal - Engineering Review