The company identifies the man as 54-year-old Robert Gill who has been with the company for 15 years.
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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.
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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.