David Lucas Provencher was flown by medical helicopter to Brigham and Women's Hospital in Boston for treatment of burns and a head injury.
Provencher, whose address was not available, had been in fair condition Wednesday night, but was allowed to go home yesterday, according to a hospital spokesman.
The barrel that exploded contained discarded oil and other fluids from vehicles, firefighters said.
Firefighters responded to the waste management company about 1:30 p.m. on Wednesday, when a flash explosion injured Provencher while cutting open the 55-gallon barrel with an acetylene torch.
Salem's fire inspector, Jeff Emanuelson, said yesterday that Provencher was instructed by his supervisor to slice open the barrel. The company, at 53 Pelham Road, was aware of what was stored in the barrel, he said.
"From what we understand, it was used to store waste oil and waste fluids from their mechanical division," Emanuelson said. "That's where they would put waste oil and antifreeze from their fleet of vehicles."
Emanuelson said he could not discuss the matter further because the incident is being investigated by police and the Occupational Safety and Health Administration. An OSHA spokesman could not be reached for comment yesterday.
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