07-01-2024 Council Work Session Packet

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Ms. Katie Larsen 06/06/2024 Page 3 Madinah Lakes – Concept Plan - Engineering Review 3.The City anticipates that a stormwater reuse system will need to be installed as part of the project which will require a water balance study be included with the next submittal. •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. The existing properties are identified as a Stage 1A and 1B Planned Service Areas in the 2040 Comprehensive Plan. The City will need to evaluate the timing of expansion particularly into service area 1B. There is existing 12-inch diameter ductile iron pipe (DIP) water main along Robinson Drive and Century Trail south of the site and a 8-inch DIP water main on Carl Street (west cul-de-sac). There is a 10-inch DIP water stub for the Robinson Property off of Cardinal Way and two 12-inch diameter DIP water main stubs at the intersection of Robinson Drive and Century Trail. Applicant to verify water pressure is adequate for all locations within the development including commercial and multifamily locations. The watermain will need to be looped through the site, and the watermain will need to include a 12-inch diameter trunk watermain as identified in the Comprehensive Plan. All proposed units are required to be on the municipal water supply. Comments: 1.Provide development utility plan meeting City requirements with preliminary plat submittal •Sanitary Sewer The 2040 Comprehensive Plan identifies future 10-inch diameter and 15-inch diameter trunk lines within the site. The 2040 Comprehensive Plan also identifies future forcemain along Sunset Avenue (CSAH 53) to the west of the site and future 10-inch and 12-inch trunk lines along Main Street (CSAH 14) north of the site. The existing properties are identified as a Stage 1A and 1B Planned Service Areas in the 2040 Comprehensive Plan and they are located in the 2I sanitary sub-district. There is existing 12-inch diameter polyvinyl chloride (PVC) sanitary sewer along Robinson Drive and 15-inch diameter PVC sanitary sewer along Century Trail. A sewer stub extends to the north from the manhole at the intersection of Robinson Drive and Century Trail with an invert of 879.78. There is a sanitary manhole at the north end of Cardinal Way with an