California begins hazardous cleanup at aerospace facility
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California authorities are launching a multi‑day hazardous materials cleanup at the GKN Aerospace facility in Garden Grove following a major chemical emergency involving methyl methacrylate (MMA). The operation, scheduled from Monday, June 29, 2026, through Thursday, will remove and dispose of thousands of gallons of neutralized MMA under a unified command structure. The crisis began on May 21, 2026, when a cooling system valve failure caused temperature and pressure to spike in a 7,000‑gallon MMA storage tank, threatening a Boiling Liquid Expanding Vapor Explosion. A crack later relieved pressure, and evacuation orders for about 50,000 residents were lifted on May 26.
Timeline
- May 21, 2026 Tank cooling valve fails, pressure rises
- May 21, 2026 Secondary safety systems also fail
- May 21, 2026 Authorities warn of potential BLEVE
- May 21, 2026 Newsom declares Orange County emergency
- Late May 2026 Approximately 50,000 residents evacuated countywide
- May 26, 2026 Tank crack relieves internal pressure
- May 26, 2026 Evacuation orders lifted after assessment
- June 29, 2026 Multi‑day hazmat cleanup operation begins
Sources
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