SAN FRANCISCO (KCBS) – Pacific Gas and Electric considers 239 of its natural gas transmission lines to be at risk of failing – in a fashion similar to the line that exploded in San Bruno almost two years ago.

According to a company assessment obtained by the San Francisco Chronicle, PG&E has identified more than 500 trouble spots on those lines. Those spots range from a few feet in length to more than a mile. They include pipe seam welds susceptible to failing because they are old or because the company pressurized the pipes beyond legal limits without testing them afterward for possible problems.

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The pipes include several lines running along the Peninsula, including the one that exploded in San Bruno and one in the East Bay between Sunol and Livermore.

PG&E plans to replace some lines and and test others.

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According to the Chronicle, the company reached its conclusion after commissioning a study of its 1,000 mile network of gas transmission lines in urban areas. Engineers with PG&E and its consulting company, Kiefner & Associates, reviewed inspection histories and pipeline records.

KCBS’ Tim Ryan Reports:

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