Report: PG&E still missing key documents


National Transportation Safety Board investigators have been hampered by a lack of information about the section of substandard pipe where the blast occurred at a flawed weld.

Investigators say PG&E has relied on faulty or non-existent data to vouch for the safety of much of the rest of the Milpitas-San Francisco pipeline, according to a report by the San Francisco Chronicle.

Investigators have found PG&E does not know the thickness of the pipe's walls for 21 miles and doesn't know who manufactured the line or how deeply the pipe is buried.

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