Washington Boulevard

Washington Boulevard Overhead and Paseo Padre Parkway Underpass, Fremont, CA

Project Dates: 2001-2009

Client: Bay Area Rapid Transit (BART) and the City of Fremont

Cost: $111 Million

Project Description: The Washington Boulevard and Paseo Padre Parkway Project created new underpass and overhead structures across the alignment of Union Pacific Railroad and BART tracks.  The project included new embankments for the elevated profile grade along Washington Boulevard, realigned Osgood Road and Driscoll Road, and built Mechanically Stabilized Earth (MSE) walls for support.  The Paseo Padre Underpass included Deep Soil Mixture (DSM) walls and shoring systems that saved BART significant money. The project provided safe and uninterrupted traffic flow at railroad crossings, eliminated train horns, added bicycle and pedestrian circulation, improved the landscape, and added a pedestrian/bicycle bridge.

Services: PARIKH Consultants, Inc. provided Geotechnical engineering services including a geotechnical report combining the foundation recommendations for the bridge, retaining walls, and slope. The Paseo Padre Parkway underpass required a special design for Union Pacific Rail Road, BART, and pedestrian overcrossing structures. Below groundwater construction posed challenges in the design of retaining walls, pump stations, dewatering systems, and pavement designs. The proximity to the Hayward fault required geologic studies, including fault trenching for confirmation of the fault location. This resulted in the defining setbacks for Washington Boulevard Overhead structure foundations and the MSE walls. The firm provided construction support services for the project and helped mitigate challenges for the complex construction and staging. The project received the prestigious 2010 ACEC Engineering Excellence Award.

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