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Project Title & Location
Springbrook Wetland and Habitat Mitigation Bank (Nickel)
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Project Description
This project is a partnership with the City of Renton to create a wetland bank. This wetland bank establishes compensatory mitigation in advance of unavoidable impacts to wetlands and other aquatic resources for future projects within the wetland bank’s service area (portions of WRIAs 8 and 9), including I-405. The wetland bank consists of five units, totaling 130 acres. As specified performance standards are met, incremental credits from the wetland bank become available for use.
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Contractor/Consultant
HNTB Corporation is the lead consultant of the General Engineering Consultant Team.
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Recent Progress
This project establishes compensatory mitigation in advance of unavoidable impacts to wetlands and other aquatic resources for future projects within portions of two watersheds: Water Resource Inventory Areas (WRIA's) 8 and 9, the Cedar-Sammamish Watershed and the Green-Duwamish Watershed. The bank consists of five units, totaling 130 acres. This design-bid-build project was advertised on August 14, 2006, bids were opened on October 16, and the construction contract was awarded in November. Also, note that reported project costs are based on the Legislature's Final 2006 Transportation Supplemental Budget.
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Design Construction Impacts
There are no roadway construction impacts. Impacts will be on property owned by the City of Renton and will involve the following: increasing the wetland areas; improving hydrologic, water quality and habitat functions; increasing fish refuge/rearing habitat; and promoting environmental education.
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Environmental Impacts / Compliance
A corridor wide Record of Decision for the programmatic Final Environmental Impact Statement (FEIS) was received in October 2002. Project-level environmental documentation was completed on January 10, 2006.
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Impacts to Traffic
No roadway closures are expected, but public roadways will be used for removing earthwork materials from and delivery construction materials to the project site.
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