Thursday, October 16, 2014

Sunol Valley: Getting Prepared – Seismic Upgrade Work Continues

Much has already been done as mentioned in our last post, but more important work lies ahead in Sunol Valley.  Our teams continue critical work to seismically upgrade our infrastructure. As we remember the Loma Prieta earthquake this week, here are some highlights on our ongoing projects:

New Irvington Tunnel Project
The new tunnel will provide a seismically upgraded connection between water supplies from the Sierra Nevada Mountains and the Alameda Watershed to Bay Area customers. It will extend 3.5 miles and have an internal diameter of approximately 8.5 feet. Final completion is expected in mid-2015.



Calaveras Dam Replacement Project
Work continues to build a replacement dam that will be seismically safe and restore the Calaveras reservoir to its historic capacity. The reservoir provides half of the Hetch Hetchy Regional Water System’s local Bay Area water storage. To date, over 5 million cubic yards of materials have been excavated and major work is being done on the new spillway. 
Final completion is expected end of 2018. 



San Antonio Backup Pipeline Project
The San Antonio Backup Pipeline (SABPL) project will include several new facilities and improvements in the Sunol Valley to help provide for the reliable movement of Hetch Hetchy water for planned and emergency discharges under future conditions. Completion is expected in March 2015.


We are extremely proud of our hard working teams in Sunol Valley, helping all of us become better prepared for the next earthquake. For more info, please contact us at our 24 hour answer line 866-973-1476.


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