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Parks Packet 06.21.23
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Parks Packet 06.21.23
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Commissions
Meeting Date
6/21/2023
Document Type
Agenda/Packets
Commission Name
Parks
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<br />K:\020552-000\Admin\Docs\3. Phase 4_Cost Estimating\Hugo North Start Cost Estimating 052223.docx 178 E 9TH STREET | SUITE 200 | SAINT PAUL, MN | 55101 | 651.286.8450 | WSBENG.COM Memorandum <br /> <br />To: Shayla Denaway, City of Hugo <br /> <br />From: Roxy Robertson, WSB <br /> <br />Cc: Tony Havranek <br /> Mark Erichson <br /> <br />Date: May 22, 2023 <br /> <br />Re: North Star Wetland Bank Development Cost Estimate <br /> WSB Project No. 020552-000 <br /> <br /> <br />Introduction <br /> <br />The City of Hugo is interested in creating a wetland bank along the west side of Hwy 61 at the <br />North Star Elementary School. The wetland banking process generally consists of the following <br />application steps prior to approval from regulating agencies (Board of Water and Soil Resources <br />(BWSR), Wetland Conservation Act (WCA), and Army Corps of Engineers (USACE)). <br /> <br />1. Draft Prospectus (Scoping Document) <br />2. Prospectus (Concept Plan) <br />3. Draft Mitigation Banking Instrument (MBI)/Final MBI (Full Application) <br /> <br />Initial assessment phases of this project resulted in the completion of the existing vegetation <br />surveys, 2022 hydrology monitoring, a draft prospectus application, and coordination with the <br />Technical Evaluation Panel (TEP) and interagency review team (IRT). The draft prospectus <br />included a proposal to restore approximately 19 acres of wetland, rehabilitate approximately 98 <br />acres of wetland, and provide approximately 5 acres of upland buffer for a total wetland bank <br />area of 123 acres with a credit potential of around 70 credits. We removed the acres in the <br />northwest corner of the parcel to avoid the need for two conservation easements. At this point, <br />the city may move onto the Prospectus step of the application process for the wetland bank bu t <br />has requested that WSB evaluate the proposed costs for development and construction of the <br />wetland bank to determine cost and benefits of the project. <br /> <br />Wetland Bank Concept <br /> <br />WSB developed two concepts in the draft prospectus that utilize slightly different construction <br />methods to restore hydrology. <br /> <br />1. Option 1 <br /> <br />Wetland hydrology would be restored by construction of 2-3 ditch plugs in the western <br />and central north-south lateral ditches. Ditch plugs consist of clay core trenches <br />compacted with construction-grade clay topped with topsoil and vegetation. Ditch plugs <br />are keyed into the banks to prevent water from moving around them at high flows. One <br />ditch plug would be constructed at the intersection of the eastern lateral ditch and the <br />east-west main ditch channel. Two to three plugs would also be constructed in the <br />southern ditch. An outlet control structure (OCS) with a set elevation would be installed at <br />the southwestern edge of the parcel where the ditch connects to JD 3. <br />
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