East Link Extension – E335
Stacy and Witbeck/Atkinson, a Joint Venture (SWI/Atkinson) was awarded the first of 12 separate Sound Transit East Link Extension projects. This is also the first-ever GC/CM contract under the new Washington State Heavy Civil GC/CM legislation, which allows heavy civil general contractors to negotiate to self-perform up to 50 percent of the Maximum Allowable Construction Cost (MACC) and bid an additional 20 percent, requiring GC/CM's to subcontract a minimum of 30 percent of the MACC.
The E335 project includes 1.9 miles of the new rail alignment through downtown Bellevue including at-grade track, track within a tunnel, elevated track guideway, retained cut/fill segments, and a major cast-in-place segmental bridge over I-405. The four stations are at East Main Street, NE 6th Street (Bellevue Transit Center), Hospital Station, and 120th Street Station. The project also constructs the north tunnel portal, utilities, civil systems infrastructure, and 0.4 miles of storage track in the abandoned BNSF right-of-way.
The E335 project interfaces with five other Sound Transit East Link projects (E320, E330, E340, E750, and a potential Operations and Maintenance Facility), as well as private and public projects along the alignment. During the preconstruction phase, SWI/Atkinson reviewed these interfaces to identify efficiencies and modifications to reduce risk and ensure seamless project interface while supporting Sound Transit's designer in completing the final design.