In a developing situation in southern California, a damaged chemical tank at an aerospace facility has cracked, offering hope that the risk of a catastrophic explosion is diminishing. Approximately 50,000 residents of Garden Grove, a city of about 170,000 located some 40 miles south of downtown Los Angeles, have been evacuated and are anxiously awaiting a resolution.
The tank, which overheated on Thursday and began venting vapors, has prompted a coordinated response from local and state officials to avert a worst-case scenario at the GKN Aerospace Transparency Systems site. No injuries have been reported so far.
Fire officials planned to deploy a team overnight to assess whether the pressure has been relieved, which would significantly reduce the likelihood of an explosion, according to TJ McGovern, interim chief of the Orange County Fire Authority. In a video posted late Sunday to the agency's X account, McGovern noted that atmospheric modeling indicated an active leak from the tank as of Sunday evening.
Firefighters have been repeatedly spraying the tank with water in an effort to cool the chemical inside, methyl methacrylate, a substance used in the production of plastic parts. The tank's interior temperature reached 100 degrees Fahrenheit (37.8 degrees Celsius) on Sunday, a rise of 10 degrees Fahrenheit (5.5 degrees Celsius) since Saturday. Over the weekend, officials discovered a crack in the tank, which has lowered the potential for a devastating blast.
The tank at GKN Aerospace, which manufactures components for commercial and military aircraft, holds between 6,000 and 7,000 gallons (22,700 to 26,500 liters) of methyl methacrylate. Monitoring tests have found that air pollution around the evacuation zone remains within normal limits, and specialized equipment is being used to prevent gas releases, state and federal environmental officials confirmed on Saturday.
Response and Safety Measures
The primary objective for firefighters is to cool the chemical inside the tank to prevent a leak or explosion. Drones are monitoring temperatures at 10-minute intervals to detect any spikes. Containment barriers have been erected to prevent the chemical from entering storm drains, creeks, or the nearby ocean in case of a spill, as stated by Orange County Fire Authority Division Chief Craig Covey on social media.
As the internal temperature rises, methyl methacrylate transitions from liquid to gas, increasing pressure. Andrew Whelton, a Purdue University engineering professor, explained that the crack could allow product or pressure to escape, reducing the explosion risk. "Think of a soda can. If you leave it in a hot car it can explode," Whelton said. "But if you put a hole in the can, the product is released and the can itself doesn't explode."
Community Impact and Legal Action
Aerial photos from the Associated Press showed empty streets in the area on Sunday, while several evacuation shelters remain open. At a high school in neighboring La Palma, displaced residents slept in cars or on mats and sleeping bags on the asphalt. Garden Grove is adjacent to Anaheim, home to Disneyland's two theme parks, which are not under evacuation orders. Park officials stated they are monitoring the situation.
Exposure to methyl methacrylate can cause serious respiratory issues, neurological problems, and irritation to the skin, eyes, and throat, according to chemical fact sheets. On Saturday, some Garden Grove residents filed a class-action federal lawsuit against GKN Aerospace Transparency Systems, the operator of the facility. Lawyers for the residents argue that regardless of the outcome, property values in the surrounding community will be adversely affected.
GKN Aerospace did not comment on the lawsuit but has apologized to residents and businesses forced to evacuate. In a statement on Sunday, the company said it is "working around the clock to mitigate the risk of a leak." The situation remains fluid, with officials continuing to monitor the tank and air quality as the community awaits the all-clear.
