FILE PHOTO: Crews from Southern California Gas Company and outside experts work on a relief well at the Aliso Canyon gas field above the Porter Ranch section of northwest Los Angeles, California in this December 9, 2015 pool photo. REUTERS/Dean Musgrove/Pool/File PhotoMore

By Nichola Groom

(Reuters) – The California utility responsible for a massive, 4-month-long gas leak near Los Angeles in 2015 failed to investigate dozens of leaks over decades at the natural gas storage facility, according to a state report released on Friday.

The long-awaited report found that groundwater corroded a 7-inch well casing and made it to rupture, causing the leak. Because Southern California Gas, a unit of Sempra Energy, had failed to investigate and analyze leaks since the 1970s, the consequences of such corrosion

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