Authorities in Orange county say tank holding methyl methacrylate ‘actively in crisis’ and urge residents to leave Authorities in Orange county say tank holding methyl methacrylate ‘actively in crisis’ and urge residents to leave Authorities in Orange county, California have ordered the evacuation of 40,000 people over concerns about a chemical leak that threatened to spill or explode. The problem arose on Thursday at a facility owned by GKN Aerospace in the town of Garden Grove, where a