March 29, 2024
Cause of Aliso Canyon gas leak pinpointed
ALISO CANYON – (INT) – The cause of the 2015 gas leak that sickened many people and forced others from their homes was announced Friday.

The California Public Utilities Commission (CPUC) determined:

• The leak’s direct cause was a rupture of the outer 7-inch well casing due to microbial corrosion from the outside resulting from contact with groundwater.

• SoCalGas did not conduct detailed follow-up inspections or analyses after previous leaks. More than 60 casing leaks at Aliso Canyon were suspected before the October 2015 incident going back to the 1970s, but no failure investigations were conducted by SoCalGas.

• SoCalGas lacked any form of risk assessment focused on well integrity management and lacked systematic practices of external corrosion protection and a real-time, continuous pressure monitoring system for well surveillance.

The CPUC will hold a public meeting in Southern California in June or July to present and discuss the report with the public.
Story Date: May 22, 2019
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