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September 22, 2017 Page 2 Minnesota Pollution Control Agency Comment 1: Permits and Approvals: The AUAR Update indicates that a Clean Water Act (CWA) Section 404 Permit from the U.S. Army Corps of Engineers (USACE) for project related wetland impacts may be necessary. Please be aware that if a USACE Section 404 Individual Permit is required for any project activity, then an MPCA CWA Section 401 Water Quality Certification or waiver must also be obtained as part of the permitting process. The Section 401 Water Quality Certification ensures that the activity will comply with the state water quality standards. Any conditions required within the MPCA 401 Certificate are then incorporated into the USACE 404 Permit. You can find additional information about the MPCA's 401 Certification process at https:/ /www.pca.state.mn.us/water/clean-water-act-section-401-water-quality- certifications. For further information about the 401 Water Quality Certification process, please contact Jim Brist at 651-757-2245 or Bill Wilde at 651-757-2825. Response 1: Comment noted. Project proposers will be responsible for obtaining all necessary permits. Comment 2: Permits and Approvals: For new development, it may be necessary to obtain a Sanitary Sewer Extension Permit from the MPCA prior to construction. The application form and additional information on this process can be found at http://www.pca.state.mn.us/water/permits/index.htmI#sanitarysewer. Questions on the sanitary sewer extension permit process should be directed to Corey Mathisen at 651-757- 2554. Response 2: As projects are proposed, the need for permits will be evaluated and the project proposer will be required to obtain necessary approvals. Comment 3: Stormwater: Any project that will result in over 50 acres of disturbed area and has a discharge point within one mile of a special or impaired water, such as Hardwood Creek, is required to submit their Stormwater Pollution Prevention Plan (SWPPP) to the MPCA for a review at least 30 days prior to the commencement of land disturbing activities. If the SWPPP is found to be out of compliance with the terms and conditions of the General Permit, further delay may occur. The MPCA encourages the Project proposer to meet with staff at preliminary points to avoid this situation. Questions regarding SWPPPs should be directed to Todd Smith at 651- 757-2732. Response 3: Comment noted. Project proposers will be responsible for obtaining all necessary permits. Comment 4: Contamination/Spills: In the event of a spill or if contamination is discovered during development activities, it must be reported immediately to the State Duty Officer at 651-649- 5451 or 800-422-0798. Response 4: Comment noted. Project proposers are required to follow local and state environmental and water quality. Comment 5: Low Impact Design: The MPCA advocates the use of Low Impact Design (LID) practices to aid in the minimization of stormwater impacts. LID is a stormwater management approach and site -design technique that emphasizes water infiltration, values water as a resource, and promotes the use of natural systems to treat water runoff. Examples include: • Special ditches, arranged in a series, that soak up more water • Vegetated filter strips at the edges of paved surfaces • Trees or swales between rows of cars • Residential or commercial rain gardens designed to capture and soak in stormwater • Porous pavers, concrete and asphalt for sidewalks and parking lots • Narrower streets • Rain barrels and cisterns • Green roofs K:\010373-000\Admin\Docs\Comment Letters\MEMO - 092217 - commentresponse VIA—