Agenda - Environmental Policy Board - 10/15/2018

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12. Physical Impacts on Water Resources Will the project involve the physical or hydrologic alteration (dredging, filling, stream diversion, outfall structure, diking, and impoundment) of any surface waters such as a lake, pond, wetland, stream or drainage ditch? X Yes No If yes, identify water resource affected and give the DNR Protected Waters Inventory number(s) if the water resources affected are on the PWI. Describe alternatives considered and proposed mitigation measures to minimize impacts. For an AUAR, 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 "worst case scenario" or else prevent impacts through the provisions of the mitigation plan. Surface Water Hydrology The Ramsey Town Center site lies within the Lower Rum River Watershed Management Organization (LRRWMO) boundaries, but actually discharges south to the Mississippi River. The RTC lies within a watershed that extends from Lake Itasca, southeast to the Mississippi River. Figure 12.1 shows the sub -watersheds within this drainage area, as well as the water resource features within this watershed. Soils on site are illustrated in Figure 12.2, and are discussed in Items 19 and 25. The following analysis describes direct and indirect impacts to water resources associated with the RTC. A detailed description of watershed hydrology and the stormwater conveyance system is contained in Item 17. Description of Water Resources and Related Impacts A wetland delineation was performed in October 2002 by North American Wetland Engineering (NAWE) and reported in November 2002. The results of this delineation were revised on March 14, 2003 after discussion with the WCA Technical Evaluation Panel (TEP) convened to review the delineation. Figure 10.1 shows the location of delineated wetlands located wholly or partially within the RTC project area. Note that wetlands within the project area are denoted by an identifying letter (from A-E). The complete NAWE Wetland Delineation Report is contained in Appendix A. Figure 10.3 showed the location of DNR Public Waters within the RTC drainage area. Figures 12.3 and 12.4 show the location of all wetlands within the RTC project area with respect to wetland impacts. A description of each water resource is provided in Table 12.1 and a discussion of each of these water resources with respect to potential impacts follows. 12-1