07-14-25 - City Council Agenda - Laserfiche WebLink

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Mr. Michael Grochala June 12, 2025 Page 2 locations should be taken into consideration when reviewing development proposals involving potential contaminant sources such as fuel storage tanks, in which case spill prevention plans should be considered. The municipal water supply system has a DNR water appropriation permit. The water distribution system exists in the southern portion of the study area and currently extends north of Main Street on either side of 1-35E. The system will continue to be extended as development progresses. The southern portion of the study area overlaps with moderate vulnerability portions of the City of Lino Lakes and City of Centerville Drinking Water Supply Management Areas (DWSMAs)that are delineated in their respective Wellhead Protection Plans, and the moderate vulnerability classification should be considered when reviewing land use applications within those areas. The geology of the City's existing wells is consistent with other communities in the Twin Cities Metro Area. The Paleozoic sedimentary rocks around the Twin Cities Metro area have three primary aquifers (in descending order): Prairie du Chien—Jordan, Tunnel City-Wonewoc(formerly the Franconian-Ironton-Galesville (FIG)), and Mt. Simon-Hinckley. Each of these are separated by a confining layer that essentially separates the aquifers. The Prairie du Chien—Jordan aquifer is the highest yielding aquifer in the Metro Area. Although these two formations have different names and are geologically different, the two units have been shown to be hydraulically connected. All of the City's existing production wells are located in the Prairie du Chien—Jordan aquifer, and all future wells are anticipated to be as well. The City will continue to follow the typical DNR well permit process for new municipal production wells, including aquifer test pumping when necessary to evaluate aquifer sustainability and interference. Existing and future water demands for the entire City are detailed in the City's 2040 Comprehensive Water Supply Plan (Plan). Future infrastructure needs for the City, encompassing the AUAR study area, were developed in the Plan. A future well field was preliminarily located within the study area. If future wells are ultimately pursued in this area, they will require updates to the Emergency Response Area and DWSMA and associated land use considerations. The water system currently has six wells and three water towers, although Well No. 2 has been taken out of service due to poor water quality. Tower No. 3 was constructed in 2021, and Well No. 7 is anticipated in 2026. Well capacities range from 600 gallons per minute (gpm)to 1,800 gpm. The existing system firm capacity(with the largest well out of service) is 3,650 gpm excluding Well No. 2 due to poor water quality. From 2020-2024, the City averaged a total water demand of 99 gallons per capita per day and a maximum day to average day ratio (peaking factor)of 2.5. For the existing population served of approximately 18,000, this results in an average day demand of 1.78 million gallons per day (MGD) and a maximum day demand of 4.45 MGD. The DNR water appropriation permit for the City of Lino Lakes includes several restrictions imposed by the Ramsey County District Court Order from litigation related to the White Bear Lake water level. The restrictions are intended to protect the White Bear Lake water level and connected groundwater aquifers. The DNR North and East Metro Groundwater Management Area and Metropolitan Council are preparing a White Bear Lake Area Comprehensive Plan to study water supply alternatives for the Northeast Metro of the Twin Cities that both allow for growth and sustain the area's surface water and groundwater resources. The City will continue to work with regional partners like the Rice Creek Watershed District (RCWD)to evaluate and pursue alternative water supply projects like stormwater reuse for irrigation. The new residential development(Watermark)within the study area has incorporated stormwater reuse for irrigation. MA027919-000Wdmin\Docs\Water Wastewater\MEMO Water 2025-06-02.docx Page 83 of 240