N. California bridge bolt trouble noted years ago

... long, could increase the probability of internal micro-cracks, which wouldn't necessarily be caught by standard construction industry testing. -- Mistakes in heat-treating, which was repeated due to inadequate paperwork, could have introduced ...

http://www.salina.com/news/a0626-BC-US-BayBridge-BrokenR-1stLd-Writethru-04-18-1442-clone