The front door area at Solus Industrial Innovations in Rancho Santa Margarita sustained damage in the deadly explosion. Arson investigators are looking for the cause of the late-night blast. (Mark Boster / Los Angeles Times)
Plant Manager Carl E. Richardson, center, talks with two representatives from Cal/OSHA after the deadly blast at the Solus Industrial Innovations plant in Rancho Santa Margarita. (Mark Boster / Los Angeles Times)
A chunk of concrete and other debris lie on the pavement at the Solus plant in Rancho Santa Margarita, where an industrial-sized electric water heater exploded Thursday night. The blast not only sent the water heater flying through the factorys roof but also damaged the wall. (Mark Boster / Los Angeles Times)
