The Sand Creek interchange and widening project along State Route 4 in Antioch and Brentwood, California was designed to reduce traffic congestion and enhance the quality of life for residents of eastern Contra Costa County.
Since construction was completed last fall, the new roadway has delivered on its promise, and was recently honored with two construction awards:
“The teamwork and collaboration on this project was as good as I have ever seen,” says Bart Littell, project manager. “This resulted in the project being completed ahead of schedule and under budget. Winning these high-profile awards not only gains positive attention for our firm, but can cause paradigm shifts within the industry that will lead to more ‘beyond the norm’ partnering efforts.”
WSP USA served as construction manager for the $31.4 million project as part of a joint venture of Bay Cities Paving & Grading and C.C. Myers, Inc. and on behalf of the client, the Contra Costa Transportation Authority (CCTA), and the owner, Caltrans.
Work began in June 2012 and was completed in October 2014, more than $500,000 under budget and nearly two months ahead of schedule.
The project expanded State Route 4 from two lanes to four lanes from Lone Tree Way in Antioch to Sand Creek Road in Brentwood. The Sand Creek interchange now has ramps in all quadrants.
The project consisted of 3 miles of mainline freeway including 350,000 cubic yards of imported soil, the widening of one bridge and construction of five new bridges, the construction of four freeway ramps and improvements to Sand Creek Road.
By streamlining the road configurations, this entire project actually resulted in the elimination of 2.5 miles of two-lane highway and an at-grade intersection at Sand Creek Road and State Route 4.
The response from the community has been overwhelmingly positive, due to the reduced travel times and safer traveling conditions. From 2006 to 2013, the State Route 4/Sand Creek Road intersection had the highest incident rate in Brentwood. Since completion of the project, the incident rate at this intersection dropped 62 percent, and 15 minutes of congestion has been eliminated.
Although most of the partners met for the first time at the kick-off partnering workshop, it wasn’t long before everyone was operating as a united team with a singular goal in mind.
“From day one, the project team demonstrated their commitments to each other and delivered a project that improved the quality of life for the residents of east Contra Costa County,” says Eric Lilly, the resident engineer on the project. “A strong partnership of trust developed, fueled by an open, collaborative environment and strong communication. The Sand Creek interchange project exemplified the true meaning of teamwork.”
Even when the client requested the addition of a second phase to the project in August 2013, the partnership remained strong. The new phase included the design, approval and construction of one new bridge and one bridge widening, and a half-mile of new roadway alignment, which had still not been designed.
The project team coordinated weekly workshops with the designer and contractor to determine the most efficient way to construct the second phase, all while keeping the current work on schedule. By December 2013, the project team had coordinated the design and Caltrans approval, and successfully negotiated a change order to incorporate the second phase.
“Typically, it would take 18-24 months to have the designer and Caltrans complete a design of this size,” Lilly says of the second phase addition. “However, Caltrans expedited all internal reviews and comments.”
The project team not only delivered a showcase project to CCTA ahead of schedule, but managed to keep 130,000 vehicles per day moving through the area while major construction took place.
This project is part of an ongoing CCTA infrastructure plan that has invested $1.3 billion in the region to date.
“These latest improvements will greatly help in the economic growth of eastern Contra Costa County,” Lilly says. “The entire project team committed to partnering and the results show it.”