Project–At–A–Glance

WSIP Region
Bay Division

Location
Fremont, Newark, Menlo Park, East Palo Alto, Redwood City

Construction Start
March, 2010

Construction Finish
September, 2012

Current Status
Design, Environmental

Project Cost
$273M

This project is provided in response to the Seismic Reliability, Delivery Reliability and Water Supply level of service goals.

A critical component of the upgrade to the Bay Division transmission system is the addition of Bay Division Pipeline No. 5 (BDPL No. 5).  This new large-diameter pipeline would be built parallel to BDPL Nos. 1 and 2 and would provide redundancy and improve seismic reliability to the transmission system. The BDPL No. 5 would include two segments: one in the East Bay and one on the Peninsula, with a proposed new tunnel linking the two pipeline segments.

Description
The project primarily consists of:

• In the East Bay, 7 miles of 72-inch-diameter pipe would be constructed between the Irvington Portal and the Newark Portal of the new Bay Tunnel. On the Peninsula, 9 miles of 60-inch-diameter pipe would be constructed between the Ravenswood Portal of the new Bay Tunnel and the portal of the Pulgas Tunnel.
• A seismically resistant crossing of the Hayward Fault would be constructed. The crossing would include a new crossover valve vault on either side of the fault. The valves would be hydraulically actuated and include emergency batteries. The pipe between the vaults would be higher strength and installed on a special foundation or trench section.
• Isolation valves and an interconnecting pipe manifold would be constructed at each portal of the new Bay Tunnel. The facilities would include new or rehabilitated control buildings with new emergency generators.
• New crossover valves between BDPL Nos. 2 and 5 would be installed at a location in Redwood City. The crossover facility would include a new or rehabilitated control building and connections for a portable emergency generator.
• A new throttling valve would also be added on BDPL No. 5 at the Pulgas Valve Lot. The throttling valve would include a new or rehabilitated control building.
• The project originally included underground concrete vaults for crossover facilities at Newark, Ravenswood, and Redwood City Valve Lots.  The current project eliminates the concrete vaults and directly buries the valves with full access to valve actuators at these facilities.

Note: Schedule and cost information shown may vary from the 2007 Approved WSIP Schedule and Budget. The information shown reflects the current forecast information published in the latest WSIP Quarterly Report.