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Lino Lakes Local Water Management Plan 30 November 2018 – WSB Project No. 02988-500 Intercommunity Flows The City of Lino Lakes is surrounded by several neighboring communities and receives watershed runoff from Blaine, Centerville, Columbus, Hugo, Shoreview, and White Bear Township. RCWD has completed watershed-wide hydrologic and hydraulic models that includes the City of Lino Lakes as part of their District-wide Modeling Program. These models include SWMM models for public drainage systems into Rice Creek, direct drainage into Rice Creek, water quality models, Future Conditions Modeling, and a HEC-RAS model of Rice Creek. RCWD has estimated the flows to its jurisdictional reaches and, as such, downstream communities like Lino Lakes are required to include their allocated flows in their future planning studies to limit adverse impacts to their downstream neighbors of Centerville, Hugo and Circle Pines. The City is pursuing an alternate outlet for build-out conditions using RCWD’s Comprehensive Stormwater Management Plan (CSMP) provisions under RCWD Rule C.5(f). Existing intercommunity flows and modeled peak flow rates as provided by RCWD district wide modeling are shown below (Table 2-19). The City intends to either maintain or reduce intercommunity flow rates relative to the established benchmarks through its goals and policies as well as deference to RCWD rules. The City incorporates by reference the RCWD hydraulic and hydrologic model and Watershed Management Plan for stormwater runoff volumes and rates for the City’s subwatersheds. The City will regularly coordinate with the RCWD to data-share any updated component of the models, and will continue working with RCWD on future management of model input data to ensure Lino Lakes and RCWD have consistent information for future projects. Table 2-19. Benchmark Intercommunity Flow Rates Receiving City Watercourse Peak Flows [cfs] 2-Year 24-Hour Rainfall 10-Year 24-Hour Rainfall 100-Year 24-Hour Rainfall 100-Year 10-Day Snowmelt Centerville JD 3 Main Trunk 157 291 544 388 Circle Pines RCD 8 Main Trunk 9 21 39 36 Circle Pines Rice Creek 119 292 698 1214 Hugo JD 3 Branch 4 34 67 163 64 Hugo JD 3 Branch 1 15 17 53 8 Centerville ACD 55 Main Trunk 7 15 108 31 2.7 Groundwater Resources Various agencies are responsible for groundwater management and protection. The MnDNR regulates groundwater usage rate and volume as part of its charge to conserve and use the waters of the State. The MDH is the official state agency responsible for addressing all environmental health matters, including groundwater protection, the well abandonment program, and regulation of the installation of new wells. The MPCA administers and enforces laws relating to the pollution of groundwater. The Minnesota Geological Survey provides a complete account of the state’s groundwater resources. The RCWD serves in an advisory and educational role in cooperating and assisting the DNR, MDH, and the MPCA in their groundwater protection efforts. The City promotes infiltration and groundwater recharge, but follows guidance from the Minnesota Stormwater Manual and RCWD for limiting infiltration in potential stormwater hotspots and Drinking Water Supply Management Areas (DWSMA). The City is located over the Prairie du Chien-Jordan and the Mt. Simon-Hinckley aquifers, as well as glacial sand and gravel. Groundwater is at or near the surface in most of Lino Lakes (Figure 2-9). Groundwater flow generally follows the surface topography and flows towards the Rice Creek Chain of Lakes (Berg 2016) and ultimately towards the Mississippi River (Palen 1993). Groundwater has been known to seep out of natural artesian wells in the Chain of Lakes, especially near the capped St. Paul Water Authority wells in Centerville Lake. The Metropolitan Council has reviewed the surface water and groundwater interactions for Lino Lakes (Figure 2-10), which supports these observations and documents the aquifer recharge areas within Lino Lakes. Groundwater studies which include the City of Lino Lakes were completed, or were in the process of being completed during the time this plan was written. Those studies include the following: § Lino Lakes Wellhead Protection Plan § North & East Metro Groundwater Management Area Plan § Anoka County Geologic Atlas, Part B § Anoka Sand Plain Regional Hydrogeologic Assessment § Minnesota DNR Draft Groundwater Management Plan The City of Lino Lakes currently operates six active water supply wells, which draw from groundwater from the Prairie du Chien and Jordan aquifers. The total annual volume appropriated to the City’s water supply system by the DNR is 900 million gallons. Locations of the wells are identified in Figure 2-9, all six wells are located in a highly sensitive aquifer area, and the vulnerability of the City’s wells and groundwater source varies. Areas closer to Wells No. 1, 3, 4, and 5 contain a lack of low permeability material above the Prairie du Chien and Jordan buried sand, while areas closer to Well No. 2 are considered less vulnerable due to the low permeability of the surficial soils. There