FILE - This Jan. 12, 2017, file photo shows gas gathering plant on a hilltop at the Southern California Gas Company's Aliso Canyon storage facility near the Porter Ranch neighborhood of Los Angeles. An investigation into the cause of the largest-known release of methane in the U.S. faults a California utility for the way it maintained its natural gas storage field before the massive 2015 blowout. The report released Friday, May 17, 2019, by the California Public Utilities Commission says Southern California Gas Co. did not assess its wells for disaster potential and did not investigate previous ruptures. (AP Photo/Jae C. Hong, File)
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