The Alameda County Transportation Committee hired GBI to be the general contractor to construct new auxiliary lanes on I-680, one of the Bay Area’s most congested commuter corridors.
GBI built new retaining walls, widened both the Calaveras Boulevard and Jacklin Road bridges, as well as three existing bridges on the southbound side. We repaved all southbound lanes between north of Scott Creek to Grimmer Boulevard. GBI was responsible for all structures, concrete, crack & seat, grinding, underground, electrical, guardrail, signage, and striping. Additionally, we converted the High Occupancy Vehicle (HOV) lane to an Express (High Occupancy Toll (HOT)/HOV) Lane.
The agency added significant additional scope during the course of the project, which GBI handled effectively and efficiently.
In the first year of operation, speeds averaged 10 miles per hour faster in the express lane during the morning commute.