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11-10-14-WS
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11-10-14-WS
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<br /> <br />Memorandum <br /> <br />Date: November 10, 2014 <br />To: Terry Maurer, Public Works Director <br />From: Beth Kunkel, Kimley‐Horn <br /> Pamela Massaro, Wenck <br />Subject: TCAAP Natural Resource (Green) Corridor Design Update <br /> <br />The purpose of this memo is to provide Council with an update on the progress made on the design of <br />the stormwater/wetland management plans for the TCAAP site since the July 2014 work session. <br /> <br />Regulatory Requirements <br />There are a number of federal, state and local water resource regulations that need to be met on the <br />TCAAP site. Given the complexity and potential conflicts between these regulations, we have been <br />meeting with the respective agencies to confirm requirements. The four key agencies and their <br />respective approvals required are listed below: <br /> MnDOT has jurisdiction over wetland and drainage within MnDOT right‐of‐way, including the <br />interchange areas of CR H and CR I. Wetland and drainage permits will be required from MnDOT <br />for modifications to these interchanges that impact wetlands and surface water runoff. <br /> MN DNR has jurisdiction over Rice Creek (within the top of banks of the Rice Creek channel) <br />including any changes to the creek alignment, new crossings and floodplain impacts. A public <br />waters permit and floodplain review will be required for the creek realignment, crossing and <br />floodplain impacts adjacent to Rice Creek. <br /> U.S. Army Corps of Engineers has jurisdiction over waters of the US which includes certain <br />wetlands and streams. A Clean Water Act Section 404 permit will be required for wetland and <br />creek impacts. <br /> Rice Creek Watershed District has jurisdiction over TCAAP site storm water runoff, erosion <br />control, floodplains, wetlands, and creek crossings. RCWD approval is required in each of these <br />areas via a comprehensive permit. <br /> <br />Design Parameters <br />Given the overlap and complexity of these various requirements, design priorities were established to <br />meet as many of these requirements within the natural resource corridor as possible, with the following <br />priorities in this order: <br />1. Accommodate all wetland replacement for infrastructure impacts (Spine/Thumb Roads and <br />utilities, stormwater ponds, associated site grading, maintenance access, CR I/Thumb Road <br />access) <br />2. Accommodate all required stormwater rate control and infiltration for Spine/Thumb Roads <br />3. Accommodate stormwater rate control for TCAAP site development
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