Dangers from damaged California chemical tank persist. Here what to know - MyNorthwest.com

A hazardous methyl methacrylate tank at a Southern California aerospace facility prompted a large evacuation of Garden Grove residents over the Memorial Day weekend. The tank holds about 6,000 to 7,000 gallons and began leaking vapors as overheating raised pressure. Firefighters have kept the temperature below 85 degrees Fahrenheit (29.4 C) to mitigate an explosion risk, while the valves draining the tank remain nonfunctional. The EPA head described a likely low-volume release that would allow authorities to monitor, neutralize, and contain the threat. No injuries have been reported, and the evacuation zone lies west of Anaheim, with Disneyland not affected.

Environmental and health officials warn that inhaling vapor can irritate eyes, nose, and lungs and may cause dizziness or memory problems at higher exposure. The incident underscores the hazardous nature of methyl methacrylate, a flammable chemical used in resins and plastics, and the ongoing challenge of safely cooling and draining the tank.