The East Link extension will add 14 miles and 10 stations to Sound Transit’s light rail system, carrying commuters between Bellevue and Seattle.
This is a conceptual drawing of the south portal site, where the light rail will enter the Bellevue Downtown Tunnel.
This is the actual south portal site, cleared, graded, and ready for excavation. A 20 foot sound wall has been built around the entire site.
GEO is monitoring the support of excavation for the south portal. The support system will consist of more than 850 linear feet of soil nail walls.
Installed high above the construction site, this solar-charged AMTS has clear line of sight to the monitoring prisms installed on the SOE.
Monitoring prisms (red) are installed on the SOE. Control prisms (green) are installed at stable locations and used to correct for changes in the position of the AMTS.
Three prisms are visible on the head wall. The painted marks are guides for placement of the pipe arch canopy.
The pipe arch canopy is now in place. Pipes are about 70 feet long.
GEO technicians installing another AMTS. This one will be used to monitor structures along the planned alignment of the tunnel.