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Project Title & Location
I-90 - Snoqualmie Pass East - Hyak to Keechelus Dam
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Project Description
This project will improve I-90 to provide a safer, more efficient six-lane freeway from Hyak to Keechelus Dam. This project is the first of several projects that will address concerns along I-90 from Hyak to Easton. Avalanche closures and hazards due to rockfall will be minimized. Aging pavement will be replaced to provide a smoother ride. Expanded bridges and culverts will minimize wildlife collisions by providing safer crossings.
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Contractor/Consultant
General Engineering Consultant: URS Corporation - Headquartered in San Francisco, CA
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Recent Progress
Geotechnical exploration resumed in early May with additional data being collected for the design of stormwater facilities, bridges, and structural walls along Keechelus Lake. The Wetland and Aquatic Resources Mitigation Plan has been developed. A schedule for phasing multiple construction contracts has been developed, with design and permitting on track for advertisement of the first contract in early 2009. The second contract is expected to be ready for advertisement in late 2009.
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Design Construction Impacts
Bedrock along Keechelus Lake is deeper than expected in several areas. Structural walls may not be feasible at key locations and redesign is occurring. Additional geotechnical data is being gathered for the final design of modified walls and bridges.
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Environmental Impacts / Compliance
Environmental is on track to deliver the Preliminary Final Environmental Impact Statement in mid summer. The Phase 1A JARPA and Draft Mitigation Plan are expected for submittal in July.
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Impacts to Traffic
Lane closures for the next quarter are not anticipated . Rolling slowdowns are planned to occur regularly on weekday mornings July through September 2008 for helicopter support of drilling operations above the highway.
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