Inspectors missed lapse in building process that would have prevented cracks at SF Transbay center

By Michael Cabanatuan : sfchronicle – excerpt

Four levels of inspections and plans failed to prevent or uncover a construction flaw that resulted in the cracked girders that forced the closure of the Transbay Transit Center 5½ months ago, the agency’s executive director said Thursday.

Mark Zabaneh, head of the Transbay Joint Powers Authority, said three teams of quality-control inspectors working for contractors didn’t discover that a necessary grinding process, used to eliminate small cracks associated with holes that were cut into the girders, was not performed and that the authority’s own spot inspections also missed the oversight.

Those micro-cracks developed into larger cracks and, finally, a large fissure that ripped through two large steel girders that support the building. Similar girders over First Street have not cracked.

“The execution was not done properly, and that is something we are looking into,” Zabaneh said Thursday after an authority meeting. “It’s an area of great concern for us.”…(more)

There is your answer. It had to be design, execution or materials. Turns out execution is blame. Who pays for that error?

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