Pacific Gas and Electric may have erred on inspections SACRAMENTO, Oct. 23 (UPI) -- California utility company Pacific Gas and Electric Co. said it may have erred in stating sections of its state gas lines went through an inspection process. The company said about 4.5 miles of natural gas pipelines in the state were declared safe. It was later discovered, however, that the lines "may not have undergone proper integrity management assessments," the San Francisco Chronicle reports. The newspaper notes that the company said those sections of pipeline were considered at risk of corrosion failures but cited faulty record-keeping for the testing oversight. "PG&E took steps to ensure that this issue does not exist elsewhere in the system or occur again," a company statement read. PG&E believes this issue does not exist elsewhere in the system. The National Transportation Safety Board said PG&E didn't know what kind of pipe was beneath San Bruno. A defective weld seam on the pipeline was blamed for the explosion.