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Tuesday, April 22, 2014

Alaskan Way Viaduct Replacement Program



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Subject: Alaskan Way Viaduct Replacement Program
Date: Mon, 21 Apr 2014 19:06:51 -0500
To: guyperea@live.com
From: wsdot@service.govdelivery.com

Alaskan Way Viaduct Replacement Program View Online Version
Alaskan Way Viaduct Program Banner
This program is led by the Washington State Department of Transportation in partnership with the Federal Highway Administration, King County, City of Seattle and the Port of Seattle.

Alaskan Way Viaduct Replacement Program News

April 21, 2014

In this issue:

  • SR 99 tunneling machine to resume digging in March 2015
  • Alaskan Way Viaduct repair work and lane closures
  • Construction work on Dexter
  • New photo feature: Before and After
SR 99 tunneling machine to resume digging in March 2015
Today, Seattle Tunnel Partners, our design-build contractor for the tunnel project, released a new schedule that shows the SR 99 tunneling machine will resume digging by the end of March 2015.

Construction will begin late next month on the pit STP will use to access and repair damage to the machine, which stopped tunneling in December. Building the pit (pdf 715 kb) is the first of several steps STP has laid out to resume tunneling:
  • Late May: Begin building the access pit's underground walls.
  • Late July through September: Excavate the pit.
  • October: Remove the machine's cutterhead and begin repairing damage to the seal system and main bearing.
  • February 2015: Test machine to ensure it is ready to tunnel beneath downtown.
  • Late March 2015: Resume tunneling.
These construction activities will be addressed in accordance with the SR 99 tunnel contract. The updated construction timeline delays tunnel boring by up to 16 months, but STP hopes to recover as much as four months of schedule to meet the November 2016 tunnel opening date we established in our 2010 request for proposals. STP had proposed opening the tunnel in late 2015, 11 months earlier than our original requirement.
STP has informed us that crews will replace the machine's main bearing and install a more robust seal system, which could include strengthening the seals, installing redundant systems, and adding monitoring equipment. Additional details will be included in a plan to be submitted to us for review by June 16.
The repair schedule will include additional time to accommodate potential improvements to the machine that STP or the machine's manufacturer, Hitachi Zosen Corp., might choose to make after the cutterhead is removed and crews are able to perform a full inspection. We will work with our strategic technical advisory team, made up of international and national tunneling experts, as well as consultants, to review the plan.
We're disappointed by this delay, but believe the schedule is moving in the right direction. We're also focused on the bigger picture, which includes more than $750 million worth of work at the tunnel portals and elsewhere along the SR 99 corridor. That construction is not affected by the tunneling stoppage and continues full speed ahead.
West of Seattle's stadiums, crews are building the future connection between the tunnel and the new section of SR 99 that was completed in 2012 after the viaduct's southern mile was demolished. Crews are also making progress on the south portal operations building, which will house lighting, ventilation, emergency systems and other vital components needed to operate the tunnel.
Meanwhile, at the tunnel's future north portal, crews are building the connection between the tunnel and Aurora Avenue North, the north portal operations building and the 80-foot-deep pit where the tunneling machine will emerge at the end of its journey beneath downtown.
Work is also ongoing in Frederickson, Wash., where crews have manufactured 72 percent of the concrete segments that are pieced together to form the tunnel's exterior walls.  
Alaskan Way Viaduct repair work and lane closures
As you may recall, we recently completed a follow-up inspection of the Alaskan Way Viaduct. The purpose of the inspection was to seek additional information about new cracks and the expansion of existing cracks on columns and girders near Spring and Seneca streets, which crews discovered during the viaduct's regularly scheduled inspection on March 1.

During the follow-up inspection, bridge engineers conducted an in-depth evaluation of the area and determined that the cracks do not present a safety hazard. They also installed additional equipment to closely monitor any new changes that may occur over time.

This week, maintenance crews will use epoxy to fill and stabilize the cracks. These repairs will take place Tuesday, April 22 through Thursday, April 24 from 9 a.m. to 3 p.m. daily. To accommodate this work, we will close one southbound lane on the lower deck of the viaduct between Seneca and Madison streets. The shared-use path below this section of the viaduct will also be closed during this work. Bicyclists and pedestrians will be detoured to the sidewalk on the west side of Alaskan Way.
Later this year, additional work may be needed to repair the expansion joint between the viaduct's mainline and the Seneca Street off-ramp. While the expansion joint is not a safety hazard, it may have contributed to the cracking at this location. We will keep you updated as our plans progress for this piece of work.
In addition to routine maintenance and safety inspections to ensure the viaduct remains safe for drivers, we will continue to closely analyze data from the monitoring devices we recently installed.
Construction work on Dexter
Crews building new on- and off-ramps at the SR 99 tunnel's future north portal are preparing to relocate utilities along Dexter Avenue North, and Harrison and Republican streets.  

During this work, which will begin this spring and continue through the summer, Dexter will be reduced to one lane in each direction between Thomas and Mercer streets. A separate bicycle lane will be maintained on Dexter during peak commute times. Depending on the work activity, signs may direct bicyclists to merge with traffic during off-peak hours.
Harrison Street will be closed between SR 99/Aurora Avenue North and Eighth Avenue North. Later this summer, crews will reopen Harrison Street and then close Republican Street.
Please visit our traffic page for up-to-date closure information.  
New photo feature: Before and After
We do our best to tell you about the progress we're making as we work to replace the viaduct. But the best way to appreciate it is to see it in photographs.
For example, it wasn't too long ago that the viaduct was nearly twice as long as it is today. Then, in 2011, crews demolished the southern mile of the double-deck highway, replacing it with a new side-by-side section of SR 99 near the stadiums. Also new to the neighborhood is the South Atlantic Street overpass, which opened earlier this year. The new overpass dramatically shortens trips between the freeways and the Port of Seattle's busiest freight terminal by allowing trucks and other traffic to bypass train blockages on South Atlantic Street. These images show the transformation.
To help you see more of the progress we're making, we've launched a new photo set on Flickr. The tunneling machine may not be moving forward at the moment, but other work is. And it's a striking story in photos. Let us show you.
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