PG&E involved in many gas line breaks in state
09/11/10 San Francisco Chronicle — Eleven of the incidents on PG&E pipelines in the last 10 years were caused by other people digging into buried lines they didn't know were there. "Someone's doing construction on a site, they may or may not have called PG&E, they're working with a backhoe, they snag the pipeline, and then all it takes is a little ignition source," said Kofi Inkabi, a postdoctoral researcher at UC Berkeley's Center for Catastrophic Risk Management.