More than 40,000 people in multiple Southern California cities are playing a dangerous game of wait-and-see on Friday after officials warned a leaking toxic chemical tank at an Orange County aerospace facility would inevitably fail and potentially explode. Orange County Fire Authority division chief Craig Covey said it was the most dangerous scenario he’s ever faced in his more than 30 years of service. Officials say the industrial tank at the Garden Grove facility is estimated to contain 7,000 gallons of methyl methacrylate, a “highly volatile” and “highly flammable” toxic substance used in the production of plastics.