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SFPUC reports 65-foot steel lining buckle on Overton Tunnel; repairs under way, 2–4 month delay estimated
Summary
SFPUC staff reported a 65-foot rupture of steel tunnel lining on the New/Overton Tunnel caused by high groundwater pressures; an independent investigation is under way, the damaged section has been removed and repairs could delay construction by an estimated two to four months.
The San Francisco Public Utilities Commission was briefed on a construction setback for the New/Overton Tunnel after staff reported that a 65-foot length of steel lining buckled during the overnight shift on Aug. 27.
Dan Wade, project director for the Water System Improvement Program, told the commission that the buckled segment was located about 8,200 feet downstream from the Alameda West Portal in one of the deepest portions of the alignment where high groundwater inflows and pressure were encountered. Wade said the left side of the steel lining "actually buckled into the tunnel several feet," and showed photos to the commission that staff said show a broken weld and…
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