2007-11-28 CC Packet - Laserfiche WebLink

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6. Water Resources. 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. 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. 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. 7. Water Use. The project will require connection to a public water supply and installation of new 12-inch water main along Main Street and individual water connections. The city's water supply, storage and distribution system has been designed to accommodate projected growth within the City as outlined in the Comprehensive Plan. As the City develops and redevelops, additional water supply wells will be necessary. Due to the shallow depth of groundwater in some areas, dewatering may be necessary in some areas during construction. A temporary water appropriations permit will be obtained from the DNR if volumes to be dewatered are such that a permit is required. A search through the records of the County Well Index (CWI) indicated that there are 25 known wells located within the project area. All of these wells are domestic use (residential) wells. None of the identified wells appear to pump large enough quantities of water as to require a DNR appropriations permit. The majority of the wells are completed in the drift aquifer and are less than 100 feet in depth. Three bedrock-aquifer wells are completed at depths ranging from 92-106 feet. Centerville Downtown Redevelopment Page 20