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Springbrook Creek Wetland and Habitat Mitigation Bank: Overview

Springbrook Creek Wetland and Habitat Mitigation Bank: Overview. Early Action Site Selection Proposal Benefits. Purpose: I-405/SR 167 Early Environmental Demonstration. Pilot EEI to be used by corridor program Establish site selection criteria

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Springbrook Creek Wetland and Habitat Mitigation Bank: Overview

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  1. Springbrook Creek Wetland and Habitat Mitigation Bank: Overview • Early Action • Site Selection • Proposal • Benefits

  2. Purpose: I-405/SR 167 Early Environmental Demonstration • Pilot EEI to be used by corridor program • Establish site selection criteria • Focus on aquatic resources, fish, wetlands, water quantity, floodplains • Provide refinements/improvements for corridor EEI

  3. Early Environmental Demonstration: Methodology • Evaluate Impacts • Compile Project List • Fatal Flaw • Second-level Criteria • “Short List” Top scoring sites

  4. Results to Implementation • Short-list “disappeared” during hold on projects • Continued talks with COR evolved from Springbrook Creek specific work to Wetland Mitigation Bank • Pitched idea to BOC • Nelson Side Channel—too close to impacts as design evolved

  5. Rationale for Site Selection • Limiting factors in watershed • Great opportunity in urban setting • NMFS: riparian not properly functioning • Juvenile survival • No LWD • Erosion/sedimentation • Degraded water quality • Lack of diversity, complexity • Non-native species • Loss of habitat in migratory corridor

  6. Existing Conditions(approx 2001) 1936 B A C E D

  7. Existing Conditions

  8. General Concept • WSDOT takes credit for road improvements • Renton uses credit for city projects, development • Permitted and Constructed as Separate Project

  9. General Concept • Re-establish 18 acres wetland • Rehabilitate 52 acres wetland • Enhance: 32.5 acres wetland and buffer • Coordinate/Integrate with surrounding land use • Make trail connection

  10. How will functions be improved? • 135,517 native plants will be planted • 50.5 acres invasive plants to be removed/monitored • 186 habitat structures

  11. Design Elements: Trail as part of Urban Banking List elements (water control, excavation, etc.) Insert zoomed in picture of C and E.

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