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

SF Police Commission votes to expand use-of-force policy

Decision to bypass union negotiations could set stage for litigation

City Attorney seeks to recoup ‘illegal profits’ gained by Walter Wong through city contracts

San Francisco will seek to recover “illegal profits” gained by well-known permit… Continue reading

Free Muni for Youth program expansion halted by SFMTA budget crisis

Low- and moderate-income kids can still travel for free

Newsom orders multiple counties to shut down bars, indoor restaurants as COVID-19 cases rise

As confirmed cases of COVID-19 rise in California, Gov. Gavin Newsom on… Continue reading

Most Read