T.Y. Lin International (TYLI), a globally recognized, full-service infrastructure consulting firm, announces the completion of the Highway 4 Widening - Segment 3 Project (Segment 3) in Contra Costa County, California. Serving as Prime Consultant for the Contra Costa Transportation Authority (CCTA), working in cooperation with the California Department of Transportation (Caltrans) and the Cities of Pittsburg and Antioch, TYLI was responsible for project management, environmental coordination, community outreach, design development, agency coordination and interface, utility coordination and relocation, and right-of-way engineering and acquisition support. The Highway 4 Widening Projects represent CCTA’s “Promises Made, Promises Kept” commitment to deliver critical transportation infrastructure projects to Contra Costa County communities. A ribbon-cutting ceremony was held on July 20, 2016 to mark the completion of the project.
Segment 3 widened six miles of the heavily trafficked state route from four lanes to eight lanes beginning between Contra Loma Boulevard and Lone Tree Way and terminating at the State Route 160 connector. Staged construction successfully maintained two open lanes in each direction at all times to minimize disruptions to the highway’s 130,000 daily users. The eight-lane highway carries one high occupancy vehicle (HOV) lane and three mixed flow lanes in each direction, with auxiliary lanes added between interchanges. Multi-modal bridges were also constructed in the median to accommodate mass transit.
TYLI also oversaw design and construction services that widened an overcrossing at Hillcrest Avenue, replaced Highway 4 undercrossings at “A” Street and Cavallo Road and a pedestrian undercrossing at Roosevelt Lane, added new eBART underpasses at “A” Street and Cavallo Road, and constructed 22 retaining walls and 15 sound walls. Other work consisted of the planning and design for new traffic signals, signal modifications, temporary signals, emergency vehicle preemption, portable changeable message signs, traffic operation system, street and safety lighting, and pedestrian undercrossing lighting.
Extensive coordination was required with CCTA, Caltrans, the City of Antioch, and other agencies to deliver the major corridor improvement project, which crossed three jurisdictional boundaries. TYLI delivered a plans, specifications, and estimates (PS&E) package that blended the requirements and design standards of Caltrans and the affected cities and public agencies while maintaining the project scope, schedule, and budget.
“T.Y. Lin International came to this critically important transportation project with extensive experience in managing corridor projects and fully committed to the success of our project partners. We are honored to have served as Prime Consultant on Segment 3 of the Highway 4 Widening Project for the Contra Costa Transportation Authority,” said Michael F. Pyrz, P.E., Northern California District Director.
During the design phase, TYLI participated in proactive community meetings and provided CCTA with strategic decision-making assistance for risk identification and management. Internal constructability reviews were also performed and coordinated with CCTA, Caltrans, and design teams on two adjacent segments undergoing improvements. In addition, the TYLI team utilized value engineering strategies in order to expedite all design milestones through local agencies and Caltrans. These strategies significantly reduced construction cost estimates at each milestone and underscored the firm’s capabilities in developing realistic project cost estimates and identifying cost-savings measures.
Nov 21, 2019
Jul 1, 2019