Less gas in the field means it would operate at lower pressure levels. That lower pressure translates into less stress on the gas field's aging, but recently overhauled, wells.
Aliso Canyon, the region's largest underground gas storage field, has been closed since a gas well disastrously blew out in October 2015. The leak drove 8,000 families from their homes and led to mass complaints of nosebleeds, nausea, headaches and other maladies.
At its peak, the leak doubled the methane emissions rate for the entire Los Angeles basin.
California regulators recorded video of the moment in February 2016 when the leak was sealed (the gas is invisible to the naked eye, but can be viewed on infrared camera):
A two-part meeting held by regulators will take public input on new conditions that could be imposed on field owner Southern California Gas Co.
The meeting will be from 5:30 p.m. to 9 p.m. on both Wednesday, Feb. 1, and Thursday, Feb. 2, at the Hilton Woodland Hills. The public may also submit comments about reopening and operating the gas field to Alisocomments@conservation.ca.gov.
The Public Utilities Commission will make a decision whether to reopen the field following analysis of public comment. That process could take weeks or months, officials have said.
SoCal Gas has been under orders to repair or improve aging wells at what is the largest natural gas storage facility in the West.
The state says less than a third of reworked wells now pass the rigorous tests required after the blowout.
The risk of the aging wells to rupturing in an earthquake on the nearby Santa Susanna Fault was an open question at the Aliso Canyon gas field, one that merited further study, according to a letter signed by six representatives of the Sandia, Lawrence Berkeley and Lawrence Livermore national labs.
They said that while it’s common for scientists to study how buildings and other structures hold up during earthquakes, little is known about the risk to wells like those at Aliso Canyon. The field has 114 wells that were sunk 9,000 feet into the earth in the 1940s. Of those wells, 34 have been overhauled to replace the inner tubing, and the rest have been temporarily plugged.
State Sen. Henry Stern introduced a bill Tuesday that would stop SoCal Gas from resuming gas injections until an independent state-ordered investigation into the root cause of the gas well blowout is completed.
"If we don’t know what went wrong, how can we prevent it from happening again?” the Canoga Park Democrat said in a statement.