The company identifies the man as 54-year-old Robert Gill who has been with the company for 15 years.
According to authorities, the accident happened while a crew was cleaning up debris from a Highway 17 mudslide where a dump truck backed over Gill by accident.
Another worker was injured and has been identified as Stephen Whitmire. His status is currently unknown.
Graniterock Construction posted a picture of Gill along with condolences to the family.
Gill leaves behind a wife and two kids.
Stay with Action News for more on this developing story.