Construction on the fourth bore is expected to enter a new phase this week with assembly of the road header on the Orinda side in preparation to begin boring a hole in the mountain. Jeff Weiss, Caltrans spokesman said, “There’s still a lot of work to be done building the portal walls and retaining walls. Once that’s done we’re going to start boring and you’ll see dirt coming out of a new tunnel.”
Source:
• Caldecott Tunnel Construction in Phase Four- KCBS
