Project–At–A–Glance

WSIP Region
Peninsula

Location
Unincorporated
San Mateo County

Construction Start
December, 2008

Construction Finish
September, 2011

Current Status
Design, Environmental

Project Cost
$94M

The New Crystal Springs Bypass Tunnel is being constructed to provide redundancy to the existing Crystal Springs Bypass Pipeline. This pipeline is a critical link in transmitting all of the water from the Sierra and East Bay supplies to the Peninsula and City of San Francisco.
The tunnel project received certification of its environmental impact report (EIR) in June 2008, and subsequent approval by the SFPUC Commission in July.  Construction is anticipated to start in Winter 2008. The project is provided in response to the Seismic Reliability and Delivery Reliability level of service goals.

Description
The project consists of:
Constructing a 4,200-foot-long tunnel with an 8-foot-diameter welded steel liner.  Vertical shafts on each end of the tunnel will be built to accommodate the tunnel boring machine and future maintenance. 

• The southern shaft will include a connection to the existing Crystal Springs Bypass Pipeline near the north end of the existing Bypass Tunnel; as the existing pipeline has been determined to be seismically reliable in this area. 
• The northern shaft of the new tunnel will tie into the southern ends of both Crystal Springs Pipeline No. 2 and Sunset Supply Line. 
• Installing new isolation valves, valve vaults and standby power facility.
• The existing pipeline will remain in service to provide redundancy for inspection of the tunnel.

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.