Evacuation Orders Lifted for 50,000 Residents After Chemical Incident at California Aerospace Plant

<p>Evacuation orders related to a hazardous materials incident at a Southern California aerospace facility were lifted on Tuesday night, allowing approximately 50,000 residents to return home. The final evacuation order for residents in Garden Grove near a damaged chemical tank at GKN Aerospace Transparency Systems was rescinded after the tank's temperature stabilized.</p><p>Authorities had ordered evacuations after a tank containing highly flammable methyl methacrylate (MMA) overheated and became compromised. A crack formed in the tank over Memorial Day weekend, which relieved pressure and helped prevent a potential explosion.</p><p>Orange County Fire Authority Division Chief Craig Covey confirmed that all residents were cleared to return home. Crews had been spraying water on the tank to lower its temperature, which had decreased from 100 degrees to 92 degrees.</p><p>Health officials reported that monitoring had not detected hazardous levels of contamination or fumes, but they will continue to monitor air quality, sewer systems, and storm drains for several months. Exposure to MMA can cause respiratory problems and irritation to the skin, eyes, and throat, according to the Environmental Protection Agency.</p><p>Garden Grove Mayor Stephanie Klopfenstein indicated plans to hold the company accountable for the incident. GKN Aerospace stated that it is working closely with authorities and prioritizing community safety.</p><p>Governor Gavin Newsom declared a state of emergency on Saturday as crews transitioned from containment to offensive measures to prevent an explosion. The incident was likely caused by a failure in the cooling system designed to regulate the temperature inside the chemical tanks, according to Orange County Fire Authority Chief TJ McGovern.</p>