A yearlong federal probe into the San Bruno natural gas disaster hasn’t determined where the ruptured pipe segment came from or who is responsible for its numerous welding defects, a critical problem that means PG&E and state regulators can’t say if similar segments were installed in the Bay Area.

Deborah Hersman, chairwoman of the National Transportation Safety Board, on Monday said PG&E’s poor record-keeping prevented investigators from finding the pipe’s origin, and experts said that could increase the danger for the public.

Read more: Mercury News, August 29, 2011

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