Two companies working on the new Vikings U.S. Bank Stadium are facing over 173-thousand dollars in fines for safety violations in the death of one worker and injury to another last August. Mortenson Construction and subcontractor Berwald Roofing were cited after an investigation by the state Department of Labor’s Occupational Safety and Health Administration.(OSHA) The reports don’t provide an explanation of the accidents, but the most serious alleged violation accuses Berwald of willfully failing to have workers use proper fall protection gear.