First tunnel underneath San Francisco Bay closer to carrying water for area

A dull hum in the 9-foot-wide pipeline Thursday was the result of a fan blowing in fresh air for workers 5 miles across San Francisco Bay, who were busy pumping concrete into a void around the metal to make it strong enough to withstand a major earthquake.

The tunnel through which the water pipeline runs is the first to be bored underneath the floor of the Bay. Other pipes and tunnels, including BART’s Transbay Tube, run in trenches along the top of the Bay floor.

The $286 million San Francisco Public Utilities Commission water pipeline project is part of the larger $4.6 billion Water System Improvement Project. The single pipeline, which runs about 125 feet underground, emerging in Menlo Park on the west and Newark on the east, will replace two aging pipelines.

Workers are currently working from the eastern side of the tunnel and pumping concrete into the gap between the outer and inner layers, enabling the pipeline to withstand a major temblor on either the San Andreas or Hayward faults, SFPUC officials said, The project is expected to be completed in late 2014.Bay Area NewsBay TunnelMenlo ParkSan Francisco Public Utilities Commission

If you find our journalism valuable and relevant, please consider joining our Examiner membership program.
Find out more at www.sfexaminer.com/join/

Just Posted

Nicole Canedo looks at her City-issued Medical Reimbursement Account page on her computer outside her Berkeley apartment on Tuesday, Nov. 24, 2020. Canedo has worked numerous retail jobs in The City and the MRA has helped her with health costs. (Kevin N. Hume/S.F. Examiner)
Millions left sitting in medical reimbursement accounts by city workers

Health officials looking at how to improve access, outreach as untapped funds reach $409M

Dr. Grant Colfax, director of the San Francisco Department of Public Health. (Kevin N. Hume/S.F. Examiner)
SF moves into purple tier, triggering curfew and business shutdowns

San Francisco moved into the state’s purple COVID-19 tier Saturday, requiring The… Continue reading

Indecline, an art activist collective in San Francisco, transformed a billboard into an editorial with a message blasting immigration policies of Donald Trump’s administration. (Screenshot, Indecline website)
Has immigration fallen off the administration’s radar? Not a chance

Enforced as executive orders, Trump’s hardline policies are proceeding, against will of the people

University of San Francisco head coach Todd Golden coaches his team on defense during a 2019 gameat War Memorial Gymnasium on the campus of the University of San Francisco. (Ryan Gorcey / S.F. Examiner)
Stunner in Bubbleville: USF upsets fourth-ranked Virginia

Less than 48 hours removed from a loss to a feeble UMass… Continue reading

A dinner at three Michelin Stars restaurant The French Laundry in Yountville, Napa Valley has highlighted Gov. Gavin Newsom’s relationship with a well-known lobbyist. (Leonard Zhukovsky/Shutterstock)
The lobbyist who led Gavin Newsom to the French Laundry has a history of controversy

Lara Korte and Sophia Bollag The Sacramento Bee When photos circulated earlier… Continue reading

Most Read