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Project Title & Location
15th St. SW to S. 180th St. Stage 3: HOV Lanes--Auburn to Renton
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Project Description
This project reduces congestion by adding a northbound high occupancy vehicle lane and adding ramp meters and high occupancy vehicle bypass lanes at several interchanges.
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Contractor/Consultant
Project is not yet advertised or awarded.
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Recent Progress
Redesign of stormwater facilities has been underway. A meeting with Muti Agency Permitting representatives from the Department of Ecology and Fish & Wildlife was held in late December 2003. After reviewing the original design, the representatives determined that additional stormwater detention and treatment will be required. This will impact the budget and schedule. Additional requirements for mitigation of flood plain impacts could have further cost and schedule implications. New water treatment methods have made it possible to reduce wetland impacts by 60%. Permit application preparation is nearing completion.
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Design Construction Impacts
Recent advances in methods to treat and detain storm water runoff made the old design obsolete. The storm water system is being redesigned to meet the higher-level environmental requirements.
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Environmental Impacts / Compliance
Five-year-old permits obtained for the old design have expired. We must reapply after the storm water system is redesigned.
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Impacts to Traffic
The project will improve the efficiency of the general purpose and HOV lanes. Construction will require lane closures at times during non peak hours. Public outreach will be conducted.
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