Rising Costs and Delays in Seattle Area Wastewater Plant and Tunnels

The Washington Department of Natural Resources (DNR) has released a new study regarding the tsunami impacts that would affect Metro Seattle in the event of an earthquake on the Seattle Fault. The last known earthquake […]

The “breakthrough” media event for CALTRANS’ Devil’s Slide Tunnel project was this past Friday.  A large crowd of politicians, news crews and locals were on hand as a road-header broke through a shotcrete face in a ceremony to mark the completion of the excavation portion of the first of two tunnels.  It will still be over a year until the tunnels are opened to traffic.  The second tunnel is expected to breakthrough as early as this week. (Photo by SFGate.com)

Caltrans tunnel punch-through from Barry Parr on Vimeo.

The Video came from the Coastsider, the page also has comments from the videographer, Barry Parr, which offer a good perspective on the event.

Click on through for more links etc.

[…]

This is a great video showing the application of ground freezing to deep excavations in unstable soil and high groundwater table.  It’s also a nice overview of the reason the Hetch Hetchy project was undertaken, […]