Evacuation Order in California Due to Chemical Tank Risk

Authorities are actively seeking a safe resolution following a danger at a Southern California aerospace facility. A compromised tank containing a hazardous chemical led to an evacuation order affecting over 50,000 residents. GKN Aerospace’s storage tank, holding approximately 6,000 to 7,000 gallons (22,713 to 26,498 liters) of methyl methacrylate, began venting vapors due to overheating. This incident occurred in Garden Grove, Orange County. Officials warned that a chemical leak or explosion could occur if the tank’s temperature rises further.

Emergency Measures

Firefighters have been using water to cool the tank to prevent overheating. An encouraging development was a crack in the tank over the weekend. It is expected to relieve pressure and reduce explosion risk. Despite these efforts, officials report no active leak and no chemicals have been released. So far, no injuries have occurred. However, the Memorial Day weekend saw an evacuation order for more than 50,000 residents.

Understanding the Chemical Hazard

Methyl methacrylate, the chemical involved, is a flammable, colorless liquid employed in manufacturing resins, plastics, and plastic dentures. The federal government categorizes it as a hazardous substance. The Environmental Protection Agency states that exposure can irritate the lungs, eyes, and skin. High doses may impair lung function and cause dizziness and memory issues. Prolonged exposure can lead to serious respiratory problems or unconsciousness. Despite these risks, air pollution levels in the evacuation zone remain normal.

Problems with the Storage Tank

The tank’s drainage valves are malfunctioning. Without proper measures, a major chemical spill or explosion is possible. Efforts are focused on maintaining the tank’s temperature below 85 degrees F (29.4 degrees C) to relieve internal pressure. According to EPA chief Lee Zeldin, a ‘low-volume release’ is the most plausible outcome. This would allow officials to ‘monitor, neutralize, and contain the threat.’

Potential Explosion Scenarios

If the tank’s temperature increases, pressure will build, converting methyl methacrylate from liquid to gas. This transition heightens the explosion risk, potentially igniting nearby tanks. Should an explosion occur, the chemical would disperse, forming hazardous vapors. Dr. Regina Chinsio-Kwong, Orange County’s top health officer, highlights the danger of inhaling these vapors. Photos reveal empty streets in the area. Several evacuation shelters have opened to support displaced residents.

Looking Forward

Officials noted the crack in the tank as a positive sign, suggesting decreased explosion risk. Captain Wayhowe Huang from the Orange County Fire Authority confirmed there’s no leak into the atmosphere. The Fire Authority planned ‘an all-night mission’ to assess pressure release. This operation aims to mitigate the worst-case explosion scenario, according to interim chief TJ McGovern. Zeldin added that managing a low-volume release would ease tank pressure. GKN Aerospace is cooperating with local authorities to resolve the issue.