08-04-25 - City Council Work Session Agenda

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12. Water Resources AUAR Guidance: The information called for on the EAW form should be supplied for any of the infrastructure associated with the AUAR development scenarios, and for any development expected to physically impact any water resources. Where it is uncertain whether water resources will be impacted depending on the exact design of future development, the AUAR should cover the possible impacts through a "worst case scenario" or else prevent impacts through the provisions of the mitigation plan. a. Describe surface water and groundwater features on or near the site below. Surface Water — lakes, streams, wetlands, intermittent channels, and county/judicial ditches. Include any special designations such as public waters, shoreland classification and floodplain/floodway, trout stream/lake, wildlife lakes, migratory waterfowl feeding/resting lake, and outstanding resource value water. Include the presence of aquatic invasive species and the water quality impairments or special designations listed on the current MPCA 303d Impaired Waters List that are within 1 mile of the project. Include DNR Public Waters Inventory number(s), if any. Kimley-Horn reviewed available background desktop data to identify potential surface water resources within the study area (see Figure 13). According to National Wetland Inventory (NWI)18, 156.4 acres of freshwater emergent, freshwater forested/shrub, and freshwater pond wetlands were identified within the AUAR study area, as well as 17.5 acres of riverine features. The Rice Creek Watershed District (RCWD) Comprehensive Wetland Protection Management Plan (CWPMP) establishes protections to the Wetland Management Corridors. High priority wetlands establish critical nodes and linkages for what will become the Wetland Management Corridors. Wetland quality was assessed by looking at the function of the wetland habitat, characteristic wetland hydrology and water quality, wetland role in downstream flooding, as well as plant species and community diversity. The northeastern and southern portions of the study area include wetlands that are designated as high priority status and are shown in Figure 13.Therefore, a Wetland Management Corridor is identified within the study area and development practices must abide by the guidelines identified in Rule F.6. of the CWPMC19. All aquatic resource data is based upon a desktop review and has not been field verified. The site generally drains through the existing public and private ditch systems which bisect the study area from the northwest to the south, with discharges to the onsite wetlands before flowing offsite to the southeast. The ditches mapped throughout the study area align with mapped National Hydrography Dataset (NHD) flowlines and NWI riverine features. These ditches are generally located between agricultural fields or adjacent to existing roadways and congregate in the southeastern portion of the study area before flowing offsite to the south. The public ditches located onsite are part of the Anoka County Ditch (ACD) system 10-22-32, denoted as the Public Drainage System on Figure 13. Three unnamed Minnesota Department of Natural Resources (DNR) public water wetlands are mapped in the northeast corner of the study area and generally align with NWI mapped wetlands. Multiple NWI wetlands and riverine features are mapped within one mile of the study area (see Figure 14). These features generally align with offsite high priority wetlands identified by the Lino Lakes Resource Management Plan. Additionally, multiple NHD flowlines and waterbodies are mapped within one mile of the study 18 Source: National Wetland Inventory for Minnesota (2019) 19 Source: Rice Creek Watershed District Comprehensive Wetland Protection Management Plan Rule F.6. Lino Lakes Main Street - AUAR 35 July 2025 Page 43 of 617