Pipelines in the Alameda County Water District are nearing the end of their useful lives and need replacement. There are also portions of the conveyance system that will be upsized to better provide water service to customers and reduce transmission inefficiencies. West Yost is designing more than seven thousand feet of new water mains, which includes a crossing of Mission Creek, and will provide bid support and construction services. Construction is scheduled to begin in April 2021.
Because continuous water service must be provided to customers, West Yost is minimizing service shutdowns and maintaining system performance by careful project phasing. Significant agency and project coordination is required to maintain this phasing because the Driscoll main will cross pipelines from three additional agencies, encroach into the Caltrans right-of-way, and service a local school. The mains follow a major roadway (Driscoll Road) and traffic considerations are important.
The City of Fremont is a dense metropolitan area with utilities often crowded together. In addition, the project spans two pressure zones. The connections to existing structures include different pipe sizes in both steel and asbestos cement pipes. After the improvements are installed, some of the existing asbestos cement pipes will be removed.