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Page 13 <br /> <br /> <br />Table 13. Floodway Data <br />Flooding <br />Source Floodway 1% Annual Chance Flood Water Surface <br />Elevation Cross Section Distance Width <br />(ft.) <br />Section <br />Area <br />(sqft.) <br />Mean <br />Velocity <br />(ft. per <br />second) <br />Regulatory <br />(ft. NAVD) <br />Without <br />Floodway <br />(ft. <br />NAVD) <br />With <br />Floodway <br />(ft. <br />NAVD) Increase (ft.) F 12,600 380/778 10,585 6.3 860.0 860.0 860.2 0.2 <br />G 14,800 1,080/ <br />1,366 14,335 4.6 861.0 861.0 861.2 0.2 <br /> <br />The Minnesota Pollution Control Agency’s (MPCA) 2024 impaired list was approved by the <br />U.S. Environmental Protection Agency (EPA) in April 2024. The portion of the Mississippi <br />River adjacent to the project area is designated as impaired. No other impaired waterbodies are <br />within one mile of the project area (Table 14). The TMDL study listed in Table 14 is in <br />reference to Minnesota’s statewide mercury TMDL study. Per the MPCA, “mercury emitted into <br />the atmosphere moves with wind and weather and may deposit anywhere, on land or water. <br />Mercury pollution from outside the state affects Minnesota, and mercury concentrations in fish <br />haven't significantly declined despite emissions reductions in North America” (56). The <br />development’s anticipated contribution to mercury is estimated to be similar to other residential <br />sites and consist of primarily consumer products (appliances, batteries, electronics, light bulbs, <br />thermometers, etc.). The TMDL Implementation Plan recommends increasing the participation <br />in existing household hazardous waste (HHW) collection programs. Sherburne County holds <br />collection events for HHW and there is a HHW facility located in Waite Park, Minnesota. <br /> <br />Table 14. Impaired Water Within One Mile of the Project Area <br />Water <br />Body Name <br />and Type <br />Assessment <br />Unit Identified <br />(AUID) <br />Year <br />Added <br />to List <br />Affected <br />Designated <br />Use <br />Pollutant <br />or Stressor <br />Total Maximum <br />Daily Load <br />(TMDL) Status <br />Mississippi <br />River <br />(Stream) <br />07010203-729 <br />2002 Aquatic <br />Recreation <br />Fecal <br />Coliform Not Listed <br />1998 Aquatic <br />Consumption <br />PCBs in <br />Fish Tissue Not Listed <br />1998 Aquatic <br />Consumption <br />Mercury in <br />Fish Tissue <br />Approved 2007 <br />TMDL ID: <br />PRJ07770-001 <br />1 TMDL Studies were not prepared or required as part of the Oakwater Ridge development. <br /> <br />There are no county/judicial ditches within the project limits. <br /> <br />ii) Groundwater – aquifers, springs, seeps. Include: 1) depth to groundwater; 2) if project <br />is within a MDH wellhead protection area; 3) identification of any onsite and/or <br />nearby wells, including unique numbers and well logs if available. If there are no <br />wells known on site or nearby, explain the methodology used to determine this. <br /> <br />Four groundwater seep locations were observed along the base of the hillslope in the lower