On August 24, 2010 Caltrans, the Contra Costa Transportation
Authority (CCTA) and other project partners marked an historic moment for the Caldecott
Fourth Bore Project.
Standing next to a monolithic custom-designed,
electric-powered road header, dignitaries gathered at the tunnel’s eastern
portal in Orinda to mark the beginning of a
project that had been years in coming.
Three years to the day that tunneling began; the Lafayette
Historical Society will mark a significant anniversary of the Caldecott Fourth
Bore Project. Senior Geological Engineer
Chris Risden and Fourth Bore Public Information Officer Ivy Morrison will use
dramatic tunnel photos and geological specimens from the Fourth Bore to provide
a behind-the-scenes overview of tunnel history, geology and excavation, as well
as recent footage capturing the tunnel’s progress, as it nears completion.
