08-04-25 - City Council Work Session Agenda

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According to the Natural Resources Conservation Service (NRCS) Web Soil Survey, the area is comprised of eight different soil types (see Table 6 and Figure 12). The erosion hazard rating included in Table 6 indicates the hazard of soil loss from off -road areas after disturbance activities that expose the soil surface. Within the study area, the soils are almost entirely mapped as a slight hazard, meaning that erosion is unlikely under ordinary climate conditions. The remaining 0.1 % of the study area is mapped as cut and fill land which is not rated for soil erosion hazard. A previous Geotechnical Evaluation Report was conducted for a portion of the study area in 2021 for another proposed development that did not advance. Soil borings were conducted and noted topsoil in the area was mostly black and brown soils consisting of peat with lesser amounts of clay and silty sand. Topsoil in the area was found to be generally moist in nature. Discovered below the topsoil was a layer generally consisting of sand, with some silt or sand -silt mixtures also recorded. This report only covers a portion of the AUAR study area, south of Main Street to Robinson Drive. It is anticipated that future developers will complete a geotechnical report that would provide recommendations for structural and foundation design based on the soil types in the study area. Topography within the study area varies from 892 to 912 feet above mean sea level in elevation. The study area generally drains south via agricultural ditches located throughout the study area. Scenario 1 and 2 Under Scenarios 1 and 2, grading activities would be designed to preserve the current drainage patterns and protect the sensitive areas. Grading is expected to be done in phases as the individual developments are approved and will need to follow the overall drainage patterns of the area. Building pads will be constructed to meet the floodplain separation criteria and water quality features and will be graded into the terrain throughout the AUAR area. Impacts to sensitive areas and natural features will be taken into account when developing the grading plans for the development and will follow all local, state and federal guidelines for any impacts to these sensitive areas. Floodplain fill will most likely occur on the site, and areas of floodplain mitigation will be developed as part of the grading plans for each development based on their specific impacts. It is unclear on how much fill will be needed for each development until they are specifically refined and approved by the local jurisdictions, but in general it is anticipated that earthmoving within the study area will consist of developing several water feature areas (i.e. stormwater ponds) and using onsite materials to elevate the building and road areas throughout this area. Some import material may be required for the specific developments and this material will need to meet the standards for clean fill as set by the Minnesota Pollution Control Agency (MPCA) for residential and commercial developments. Where appropriate, slope stabilization will be provided by means of vegetation establishment, erosion control blankets, or other standard methods of erosion and sediment control. The proposed development within the AUAR study area will comply with the City of Lino Lakes erosion and sediment control standards." A National Pollutant Discharge Elimination System Construction Stormwater Permit (NPDES) and Stormwater Pollution Prevention Program (SWPPP) will be obtained prior to any earthwork or grading activities within the AUAR study area. To the extent possible, existing soils will be used for future development. Based on the NRCS soil map, the site will likely require typical subgrade preparation. 17 Source: Ordinance: �1007.050 DRAINAGE Lino Lakes Main Street - AUAR 32 July 2025 Page 40 of 617