Tens of thousands have evacuated as emergency crews try to secure a tank loaded with 7,000 gallons of methyl methacrylate at an aerospace plastics facility in Orange County.

The military aerospace giant at the enter of a looming toxic chemical disaster in Southern California previously paid nearly $910,000 to settle environmental violations tied to the same facility where officials fear an overheated tank could explode as early as Monday morning.

The exact nature of the damage, and what contingencies are in place to deal with it, have not been made clear.

Disneyland has said it is monitoring a dangerous chemical tank that is threatening to explode in nearby Garden Grove. The entertainment giant released a statement as fears mounted across Orange County over a pressurized container at a GKN Aerospace plant that could rupture or explode,

Emergency crews launch overnight mission to neutralize a volatile chemical tank at a Southern California aerospace facility in Garden Grove as Gov. Gavin Newsom declares state of emergency.

The South Coast Air Quality Management District and U.S. Environmental Protection Agency are monitoring the air. At around 8 a.m. on Sunday, a fire official said they had no changes to report.

If the failing chemical tank in Orange County does explode, the aerospace plant where it sits and dozens of homes surrounding it could suffer severe damage, according to a map released by authorities Saturday.