The Transbay Joint Powers Authority, after closing its recently dedicated Salesforce Transit Center, is investigating the cause of a cracked built-up plate girder supporting the roof garden of the nearly $2.3-billion transit hub in seismically active San Francisco. Upon inspection, investigators found another fissure in an adjacent girder in the ceiling of the third-level bus deck. Both are located in an area of the building that straddles Fremont Street, which was also closed. 

In a statement to the press on Sept. 26, which contains photos of the girder installation after erection and inspection and of the fissure, Mark Zabaneh, the TJPA's executive director, said: "We apologize for this inconvenience to the public and commuters, I would like to assure the public, this is a localized issue within the transit center and there is no impact to any adjacent properties. Additionally, our current analysis shows that this is contained within the Fremont Street area."

Click here to read the full story on ENR.com.