Worker fell at Grafton High construction site.
A representative of the agency was sent out to the scene to investigate, said Kim Castillon, assistant area director of the Springfield office of the Occupational Safety and Health Administration.
The worker fell from a second-story landing Tuesday morning and was transported to the trauma unit at the University of Massachusetts Medical Center in Worcester.
The investigator will conduct interviews and look at the evidence on site to determine if there were any violations, Castillon said.
The findings will determine whether citations would be issued, she said.