The changes within WSDOT will strengthen the delivery team and construction oversight by:
- Relocating bridge design technical advisers for better design coordination.
- Adding additional contract management staff at the Aberdeen pontoon-construction site.
- Adding up to six new quality verification staff in Aberdeen.
- Engaging a short-term claims consultant to help WSDOT assess cost and schedule impacts.
“The good news is that, despite some challenges in constructing these first six of 77 pontoons, we can be confident the pontoons will meet our standards for quality and safety when completed,” Hammond said. “We won’t accept the pontoons from our contractor until we are satisfied they meet contract specification.”
Hammond said the department remains committed to transparency and accountability with taxpayer dollars, replacing SR 520 as quickly as possible, and treating its contractors fairly as responsibility and liability with pontoon design and construction are sorted out.
The remaining budget for the SR 520 projects includes funds to address potential risks during construction. No new funds will be requested from the Legislature.
The lower overall program costs are largely the result of a good bidding environment for the pontoon, Eastside, and floating bridge and landings projects, retired risk elements with the completion of the environmental review process, and advanced design on the westside project between Lake Washington and I-5. The updated estimated cost for the 12.8-mile corridor is $4.128 billion, compared with the legislative budget cap of $4.65 billion. With the new federal loan, the unfunded portion of the program is $1.4 billion, down from an estimated $2 billion in 2010.
This new cost estimate is based on the final environmental impact statement and does not reflect potential design modifications being discussed through the Seattle community design process. WSDOT will continue to refine cost estimates based on public feedback on design elements such as the Portage Bay Bridge.
“While bids are coming in lower, we are still accounting for risks so that we are prepared for unexpected issues that can arise during construction,” said SR 520 Program Director Julie Meredith. “We are on track to deliver a new floating bridge that will last 75 years or more. We look forward to finalizing the westside design and cost estimate in the coming year so we are ready to complete the project when funding becomes available.”
A new federal TIFIA loan (Transportation Infrastructure Finance and Innovation Act), secured today in Washington, D.C., will fund construction of the north side of the west approach bridge that connects the new floating bridge to land. This will avoid reliance on the existing west approach structure that could be damaged in the event of an earthquake. The new bridge will provide three travel lanes, including one HOV and transit lane and two general-purpose lanes, and connect the regional bicycle/pedestrian path to Montlake. Construction will begin in 2014 and is expected to be complete in 2016.
“With federal funding for state highway projects in short supply, WSDOT is pleased to secure this highly-competitive, low-interest federal loan,” Hammond said. “With this funding, we will continue to make progress on replacing the most vulnerable structures in the SR 520 corridor.”
Crews are implementing recommendations from the pontoon peer review panel, modifying their plans as show below:
Click the graphic below to open as a PDF (328 kb)
Other modifications include:
- Adding additional quality verification staff to the pontoon construction office.
- Increasing material testing of the cement and concrete mix.
- Implementing additional independent peer review of design.