(Mike Koozmin/S.F. Examiner)

(Mike Koozmin/S.F. Examiner)

BART directors to vote on $267 million earthquake retrofit of underwater Transbay Tube

BART is looking to retrofit its underwater Transbay Tube to withstand a major earthquake.

The BART Board of Directors is set to vote on the potential $267 million earthquake retrofit at its regular meeting Thursday.

The transit agency put out bids for the Transbay Tube Internal Retrofit as part of the BART Earthquake Safety Program. The program includes a host of already completed retrofits, from El Cerrito Plaza Station to San Francisco’s Church Street Station, from 2009 through today.

Yet-to-be completed earthquake retrofits, according to BART, include the Coliseum and Fruitvale BART stations in the East Bay, as well as the Transbay Tube itself, which sees more than 27,300 riders pass through it in each morning commute.

Deep in a 133-foot trench, the 3.6 mile long tunnel is composed of 57 binocular-shaped steel segments that was lowered into the San Francisco Bay by a barge, and opened for service in 1974. Only 15 years later, the tube withstood the magnitude-7.1 Loma Prieta earthquake.

But the tube as it stands now must be retrofitted “in anticipation of a future major earthquake in the San Francisco Bay Area,” according to a BART staff report, which includes installation of “internal lining” along portions of the tube and a new pumping system.

“Although the tube is structurally sound, in a very large, very rare earthquake event (greater than every 500 years), the outer shell and concrete liner are predicted to crack, causing leakage,” BART spokesperson James Allison wrote in an email to the San Francisco Examiner.

The inner steel liner BART is proposing to build “is designed to prevent or slow leakage,” he wrote.

The funding mostly comes from general obligation bonds issued by BART, according to the staff report, which were approved by San Francisco, Contra Costa and Alameda county voters in 2004.

The agency classified this as a “Security Sensitive Information Contract,” wherein BART restricts access of certain information regarding the contract to identified people among the prospective bidders.

BART sent notices to 94 prospective bidders, and advertised the bid to retrofit the tube in January, according to the staff report. Engineers estimated a base bid for the project at $229 million.

The top three bids selected by BART district staff are from Shimmick/CEC Joint Venture of Oakland for $267 million, Granite/American Bridge a Joint Venture from Rancho Cordova at $293 million, and Barnard Construction Company Incorporated from Bozeman, MT at $440 million. Transit

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

Cities including San Francisco, Oakland and Berkeley are calling for large grocery and drug store chains to pay employees hazard pay for working during the COVID-19 pandemic. (Shutterstock)
SF proposes $5 hazard pay law for grocery, drug store workers

San Francisco may soon join the growing number of cities requiring large… Continue reading

Hikers walk along a closed stretch of Twin Peaks Boulevard on Friday, Jan. 22, 2021. (Kevin N. Hume/S.F. Examiner)
SFMTA board to vote on future of Twin Peaks Boulevard

The proposal would keep Burnett Avenue gate closed to vehicles, open Portola Drive

Kindergarten teacher Jennifer Klein collects crayons from students in the classroom at Lupine Hill Elementary School on Monday, Nov. 9, 2020 in Calabasas, California. (Al Seib/Los Angeles Times/TNS)
Newsom, legislators strike deal to reopen California schools

Taryn Luna and John Myers Los Angeles Times Gov. Gavin Newsom and… Continue reading

A sign about proposed development of the bluff at Thornton State Beach in Daly City on Friday, Feb. 26, 2021. (Kevin N. Hume/S.F. Examiner)
Retreat center proposed at popular state beach

Daly City residents oppose construction on ocean bluffs

City supervisors are calling for an expansion of free summer programs for elementary age kids. (Kevin N. Hume/S.F. Examiner)
Supervisors urge city to provide free summer programs for all SFUSD students

San Francisco supervisors on Monday announced a proposal to expand summer programs… Continue reading

Most Read