Agenda - Council - 10/10/1989 - Laserfiche WebLink

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E. Ground Water Temporary dewatering for roadbed construction and peat excavation may be required in the wetlands. The EAW states that groundwater varies from 0.5 minimum to 12 feet on the average. Once the project is complete, ground water levels will return to normal. Ground water quality should not be affected by this project since all peat excavations will be replaced with clean fill (EAW). Shorelands, Floodplains, Wetlands and Rivers The proposed road alignment crosses two protected wetlands 657W and l14P. The total areas of wetland impacted by this alignment is approximately 2.3 acres. A permit to alter the wetlands will be obtained from the DNR prior to the construction of the project. As part of the permit, the City will have to create new wetlands to mitigate the loss of the wetlands. The contractor will be required to comply with an erosion and sediment control plan to minimize disturbance of the adjoining wetland areas. Also, the contractor will be required to adhere to a least damage schedule minimizing impacts on wildlife during the nesting season (EAW and DNR). Surface Water Quality Surface water runoff from the project will flow into wetlands 656W, 657W and l14P. The wetlands will serve as a storm water holding pond. both wetlands 656W and l14P will drain to the Rum River. Wetland 656W drain northeasterly into County Ditch 66 and 3 and wetland l14P drains southeasterly into County Ditch 43. Erosion control measures will be adhered to during construction and all disturbed areas will be landscaped and vegetative cover will be maintained to prevent subsequent erosion. (EAW) Air Pollution, Dust and Noise Dust, air and noise impacts will occur during construction. Dust control measures will be used when needed and hours of construction operation will be limited through contract requirements to minimize noise impacts. The long term impacts on air quality should be positive since the road alignment will reduce travel time on City streets. Noise levels associated with 40mph traffic are within acceptable levels. (EAW)