Agenda - Planning Commission - 08/02/2018

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My& MINNESOTA POLLUTION CONTROL AGENCY 520 Lafayette Road North I St. Paul, Minnesota 55155-4194 I 651-296-6300 800-657-3864 I Use your preferred relay service I info.pca@state.mn.us I Equal Opportunity Employer December 12, 2017 Tina Goodroad City of Dayton 12260 South Diamond Lake Road Dayton, MN 55327 Re: North Dayton Development Scoping Environmental Assessment Worksheet Dear Tina Goodroad: Thank you for the opportunity to review and comment on the Scoping Environmental Assessment Worksheet (SEAW) for the North Dayton Development project (Project) in Dayton, Hennepin County, Minnesota. The Project consists of development of 560 acres of mixed use development and the SEAW is prepared to inform the Alternative Urban Areawide Review (AUAR). Regarding matters for which the Minnesota Pollution Control Agency (MPCA) has regulatory responsibility or other interests, the MPCA staff has the following comments for your consideration. Cover Types (Item 71 The table of cover types in this section is lacking entries in the "After" column so it is not possible to determine the changes in cover types as a result of the Project. The MPCA recommends column A be completed in the AUAR. Water Resources (Item 111 • The process to avoid, minimize, and mitigate wetlands is required and specific in -water best management practices must be included in the AUAR. • Also, if a U.S. Army Corps of Engineers 404/MPCA 401 Certification are required, an antidegradation assessment, (Minn. R. 7050.0250 to 7050.0335) may now be needed for the Project. For questions regarding 401 Certification, please contact Bill Wilde at 651-757-2825. The SEAW focuses primarily on post development stormwater controls to be utilized by the project and does not address the temporary stormwater sediment controls as specified in Item 11. ii. required to prevent impacts to area surface waters during construction. Questions regarding Construction Stormwater Permit requirements should be directed to Roberta Getman at 507-206-2629. The following should be included in the AUAR based on the site description and as required in MPCA's National Pollutant Discharge Elimination System/State Disposal System (NPDES/SDS) General Construction Stormwater permit (CSW Permit): 1. Ensure down gradient sediment controls are specifically designed for the steep slopes at the Project site to provide adequate runoff protection during construction. 2. Minimize the duration of exposed soils by phasing construction of the Project.