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North Dayton Development AUAR <br />Use Building Unit Number Gallon Average Peaking Peak Peak <br />SF of units per unit Daily Factor GPD GPM <br />per use per day demand <br />(GPD) <br />Residential NA Each 1500 100 150,000 3.0 450,000 417 <br />Residential NA Each 1700 100 170,000 3.0 510,000 472 <br />Dewatering may be necessary for installation of underground utilities. Dewatering volumes of less <br />than 50 million gallons will be permitted under the Department of Natural Resources "General Permit <br />for Temporary Water Appropriations." Volumes over 50 million gallons will require an individual <br />permit from the MnDNR. Dewatering volumes will be discharged on site. <br />iv. Surface Waters <br />1) Wetlands - Describe any anticipated physical effects or alterations to wetland features such as <br />draining, filling, permanent inundation, dredging and vegetative removal. Discuss direct and <br />indirect environmental effects from physical modification of wetlands, including the anticipated <br />effects that any proposed wetland alterations may have to the host watershed. Identify measures <br />to avoid (e.g., available alternatives that were considered), minimize, or mitigate environmental <br />effects to wetlands. Discuss whether any required compensatory wetland mitigation for <br />unavoidable wetland impacts will occur in the same minor or major watershed, and identify those <br />probable locations. <br />Several wetlands are located within the AUAR study area including the following Unnamed DNR <br />Wetlands; 27-104, 27-215, 27-216, 27-217, and 27-124 (also listed as a natural environment <br />lake).Wetland areas will be preserved in most areas. However, there may be some impacts from <br />new roadways and structures that may require mitigation. Any wetlands used for stormwater <br />treatment must undergo the wetland mitigation process. All wetland impacts would need to be <br />permitted through local, state, and federal agencies as needed at an anticipated replacement ration <br />of 2:1. In accordance with Hennepin County all wetland mitigation will be completed on -site or <br />purchased from an approved wetland bank within Hennepin County. Mitigation measures to <br />reduce wetland impacts may include silt fence, silt curtain, and buffers in addition to permanent <br />stormwater management practices such as sedimentation basins and infiltration basins. <br />2) Other surface waters- Describe any anticipated physical effects or alterations to surface water <br />features (lakes, streams, ponds, intermittent channels, county/judicial ditches) such as draining, <br />filling, permanent inundation, dredging, diking, stream diversion, impoundment, aquatic plant <br />removal and riparian alteration. Discuss direct and indirect environmental effects from physical <br />modification of water features. Identify measures to avoid, minimize, or mitigate environmental <br />effects to surface water features, including in -water Best Management Practices that are proposed <br />to avoid or minimize turbidity/sedimentation while physically altering the water features. Discuss <br />how the project will change the number or type of watercraft on any water body, including <br />current and projected watercraft usage. <br />24 <br />