Went down to the Newhall Yard and West Portal to check out the progress on the launch station.
Some of the work being done:
- During operation, the West Portal itself, also known as the TBM shaft, will also remove excavated soil out of the tunnel so that tunnel lining segments will be brought into the tunnel and installed
- The tunnel lining factory and tunnel lining storage is where tunnel lining segments will be fabricated and stored. The lining segments will be placed in the tunnel as soil is removed to create a structurally sound tube underground. One ring of the tunnel is comprised of nine segments; up to six rings per day will be installed
- The Grout Plant is also integral to the lining of the tunnel. Grout will be used to seal the tunnel lining segments in place as the TBM advances
- The Excavated Materials Bin is where the excavated soils from the tunnel will be stored until hauled offsite to be repurposed or disposed of
- A noise curtain will be constructed along the west side of the site to reduce noise from construction activities. The contractor will determine the exact length of the curtain to ensure they meet the noise mitigation requirements