04/29/2020 EB Packet - Laserfiche WebLink

Home Search

Mr. Michael Grochala April 8, 2020 Page 2 The southern portion of the study area overlaps with a moderate vulnerability portion of the City of Lino Lakes Drinking Water Supply Management Area (DWSMA) that is delineated in the City's Wellhead Protection Plan. 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. 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. The water system currently has six wells and two water towers. Tower No. 3 is currently under construction, and Well No. 7 is under investigation. 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 4,350 gpm. From 2014-2018, the City averaged a total water demand of 79 gallons per capita per day and a maximum day to average day ratio (peaking factor) of 2.8. For the existing population served of approximately 18,000, this results in an average day demand of 1.42 million gallons per day (MGD) and a maximum day demand of 3.98 MGD. Proposed Conditions Three possible development scenarios were considered. These were revised from the 2005 Original AUAR. The 2040 Comprehensive Plan corresponds to revised Scenario 1. Scenario 2 has also been revised. The third scenario considered is the 2030 Comprehensive Plan Scenario. Based on the planned land uses for each scenario, the projected water demand is summarized below. New development within the study area will connect to the municipal water system. KA015144-000\Admin\DOCSWUAR -Update 2020\Water Wastewater\MEMO - 040820-Water.docx