Project–At–A–Glance

WSIP Region
Sunol Valley

Location
Unincorporated Alameda County

Construction Start
November, 2011

Construction Finish
June, 2013

Current Status
Design, Environmental

Project Cost
$39M

The proposed San Antonio Backup Pipeline project would construct the necessary facilities to allow the SFPUC to discharge up to 315 million gallons of Hetch Hetchy water a day to San Antonio Creek or San Antonio Reservoir in the event of water quality emergency or Hetch Hetchy outages. The proposed backup pipeline, parallel to the existing San Antonio Pipeline in the Alameda Watershed, would make it possible for the SFPUC to discharge Hetch Hetchy flow while at the same time, deliver water to the Sunol Valley Water Treatment Plant (SVWTP) from San Antonio Reservoir in the opposite direction through the existing San Antonio Pipeline.  This project would enable the SVWTP to treat the 160 million gallons of water a day to water customers during an unplanned outage of Hetch Hetchy supply. The project is provided in response to both the Water Quality and Delivery Reliability level of service goals.

Description
The proposed San Antonio Backup Pipeline Project would consist of 11,300 feet of 66-inch-diameter, mortar-lined steel pipe and extends from the Alameda Siphons at the San Antonio Pump Station to a point on San Antonio Creek just downstream of the San Antonio Dam. The alignment of the Backup Pipeline is parallel to that of the existing San Antonio Pipeline. The project includes new chemical storage, feed and water quality monitoring facilities for dechlorination and pH adjustment of any discharges as well as security-related site improvements at the existing Alameda East Portal.

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.