Authorities in Orange county say tank holding methyl methacrylate ‘actively in crisis’ and urge residents to leaveAuthorities 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 Thu rsday at a facility owned by GKN Aerospace in the town of Garden Grove, where a storage tank holding methyl methacrylate began off-gassing and threatened to fail. The chemical, which is highly flammable, is used to fabricate resins and plastics. Continue reading... ...read more read less