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Table 12.1 — Water Resources Potentially Impacted <br />Basin Name/ID <br />PWI <br />Within <br />Project <br />Area* <br />A NA T <br />B NA T <br />C NA T <br />D 670W P <br />E NA T <br />Lake Itasca 110P 0 <br />Unnamed 671W 0 <br />Wetland <br />Mississippi NA 0 <br />River <br />TOTAL ACRES IMPACTED <br />* T Totally within project area <br />P Partially within project area <br />0 Outside project area <br />Wetland <br />Impact <br />(acres) <br />0.72 <br />0 <br />0 <br />0 <br />6.22 <br />0 <br />0 <br />0 <br />6.94 <br />Type of Impact <br />Fill <br />Indirect - Stormwater Discharges <br />Indirect - Stormwater Discharges <br />Indirect - Stormwater Discharges <br />Fill/Conversion to Stormwater Pond <br />Potential Outlet <br />Potential Outlet <br />Outfall Structure <br />Wetland A: Wetland A is expected to be completely filled as part of the project. A total <br />of 0.72 acres of Type 2 and Type 3 wetland will require mitigation. <br />Wetland B: Wetland B is a 1.18 acre Type 4 wetland. This wetland was constructed in <br />1997 for mitigation of the Anoka County Road 116 road construction project. The <br />mitigation site has a permanent conservation easement that encompasses both the wetland <br />and an upland buffer area. Stormwater from the RTC has the potential to indirectly <br />impact this wetland by altering the wetland hydroperiod and increasing the discharge of <br />sediments, nutrients and other pollutants. No direct impacts are anticipated to this <br />wetland. <br />Wetland C: Wetland C is a 0.20 acre Type 2 and Type 3 wetland. Stormwater from the <br />RTC has the potential to indirectly impact this wetland by altering the wetland <br />hydroperiod and increasing the discharge of sediments, nutrients and other pollutants. No <br />direct impacts are expected to this wetland. <br />Wetland D: Wetland D lies partially within the RTC project and is the only public waters <br />wetland (670W) located within the project area. This wetland is landlocked and does not <br />outlet under existing conditions. The City of Ramsey has proposed installation of an <br />outlet from this wetland, south into the RTC stormwater conveyance system. Any outlet <br />installed for this wetland will be above the DNR ordinary high water (OHW) elevation. <br />Since a key strategy for stormwater management is to maintain or provide on -site storage <br />where possible, this outlet will consist of an emergency overflow located at or above the <br />100-year flood elevation of 868.0 feet. No OHW is established for this wetland, nor are <br />wetland impacts expected from placement of this outlet pipe. <br />12-2 <br />