2007-09-12 CC Packet - Laserfiche WebLink

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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? --1L Y es _No If yes, identify water resource affected and give the DNR Public Waters Inventory number(s) if the water resources affected are on the PWI: None. Describe alternatives considered and proposed mitigation measures to minimize impacts. A wetland determination study was completed for the redevelopment area. One wetland was found to be present near the eastern boundary of the project area, generally south of the Sorel Street alignment (see Figure 5). The actual road does not extend to the wetland area. Current plans for the redevelopment project show a stormwater treatment pond in the location of the wetland. The developer will need to work with the Rice Creek Watershed District to determine if this use of the wetland is acceptable. If not, the developer will be required to find a new location for the storm pond or design a two-cell treatment system where stormwater receives primary treatment in the first cell and then discharges to the wetland for secondary treatment. The wetland will be delineated in the future. Any impacts to the wetland will be subject to the Wetland Conservation Act Replacement requirement of 2: 1 mitigation. While no direct impacts as listed above are proposed, there are public waters adjacent to or partially within the site which warrant discussion. Centerville Lake (2-6P) is a 455- acre lake located on the west side of the project area. Clearwater Creek (aka AnokalWashington County Judicial Ditch 3) flows from the east toward the project area and then turns north and crosses through the northeast corner of the project area (Figure 5). The creek is planned to be realigned in this section starting in 2007 as part of the CSAH 14 reconstruction project by Anoka County. The CSAH 14 project and associated creek realignment was not initiated by the proposed redevelopment. Direct impacts to Centerville Lake or Clearwater Creek are not proposed by the downtown redevelopment project. 13.Water use Will the project involve installation or abandonment of any water wells, connection to or changes in any public water supply or appropriation of any ground or surface water (including dewatering)? -X- Y es _No If yes, as applicable, give location and purpose of any new wells; public supply affected, changes to be made, and water quantities to be used; the source, duration, quantity and purpose of any appropriations; and unique well numbers and DNR appropriation permit numbers, if known. Identify any existing and new wells on the site map. If there are no wells known on site, explain methodology used to determine. 9