Here are some neat photographs that were provided to me by the Contra Costa Transportation Authority on the work being done in East County. The photos below show the Lean Concrete Base being poured at Sand Creek. The LCB is part of the roadway structural section and lies below the asphalt concrete which will placed on top of it.
About the Project:
The Sand Creek Road Interchange Project will widen SR4 from 2 to 4 lanes (2 in each direction) from Lone Tree Way to Sand Creek Road. The project also includes the construction of the Sand Creek Road Interchange and will provide a median wide enough to accommodate mass transit.
These improvements will result in much needed congestion relief and improve mobility for the residents of East Contra Costa County.
Contractor: Bay Cities/Myers, Joint Venture
Timeline: Construction began in June 2012. Estimated date of completion is Spring 2014.
For more information, here is the project page from the CCTA website