A 41-year-old steelworker was flown to a Boston hospital after falling 30 feet at the site of the Rockland High School expansion project Monday afternoon.

As he awaited the arrival of personnel from the federal Occupational Safety Health Administration, Rockland Fire Chief Scott Duffey said firefighters went to the site after receiving a 911 call.

“He fell approximately 30 feet from the upper beam and, on his way down, he hit another steel beam, landing in the dirt below,” Duffey said.

The protocol for dealing with such a job-site accident calls for asking OSHA to perform a site inspection, according to Duffey.

He called the man’s injuries “potentially life-threatening.”

The man, a New Hampshire resident, was taken by Rockland medics and Abington ambulance to Reed Field. A medical hospital transported him from there to Brigham and Women’s Hospital at about 4 p.m.

The injured man, whose name was not released, was talking and conscious when he was taken from the accident scene, Duffey said.

Rockland High School is being renovated as part of an $86 million project that includes construction of a new middle school next door.