Permanent Emergency Bypass Transmission Main on East Third Avenue (Fy 2025-2026) - WA-04 - City of Foster City

This project will improve water supply reliability and redundancy and minimize water service interruptions in a catastrophic seismic event. The District's 24-inch water transmission main pipeline is the sole source of potable water for the City and is attached to the Seal Slough Bridge. Seal Slough Bridge was built in the 1930's and is used as a pedway only. The bridge is aging and could fail in the event of an earthquake and with it, the District would lose its primary water supply. As part of CIP 636-Water System Improvements and Valve Replacements Project, two 12-inch emergency water bypass connections, with isolation valves and fittings were constructed on the transmission main beyond the ends of the bridge to provide a means of restoring water service quickly in the event of the bridge and pipeline failure. The project includes the purchase of 1,250 feet of 12-inch temporary bypass piping that would be stored at the District's Corporation Yard and assembled by staff quickly (within 1-2 days) in an emergency to restore flow until the transmission main could be repaired. This project is a continuation of CIP 636, as it provides for the construction of a permanent bypass pipe to be attached to the adjacent bridge on East Third Avenue and joined at the second bypass connection that was constructed as part of CIP 636. The permanent bypass pipe would provide a redundant water supply immediately and increase efficiency and speed of response during an emergency. This Project Is included in the City of Foster City's FY 2022 - 2023 Capital Improvement Plan (CIP). Per the owner, as of May 25, 2023, this project has been completed. Information regarding a design team or a general contractor has not been disclosed by the owner. *Project information has been obtained through a public capital improvement plan (CIP). A CIP is a financial schedule for short- and long-range projects which is updated regularly. Information listed in the CIP often evolves based on funding availability and the project details, including timeline and value, are subject to change. The content management team will continue to pursue additional details as they become available.

Division 33 -

Utilities, Instrumentation and Control for Utilities, Water Utilities, Water Utility Distribution Piping, Water Utility Distribution Equipment, Disinfecting of Water Utility Distribution, Water Utility Storage Tanks.