The owner of a plant that exploded and burned in January faces $20,500 in penalties levied by the federal Occupational Safety and Health Administration. The Detco Industries Incorporated plant made industrial chemicals and aerosol products, such as cleaners and disinfectants. On January sixth, the plant exploded and caught fire. Residents and businesses around the plant were evacuated and two Detco workers were injured. Detco officials said a valve leaking propane gas apparently was the ignition point for the fire. Violations alleged by OSHA range included improper training of employees who work around hazardous chemicals, failure to mark exits or establish fire-prevention and evacuation plans and other offenses. The company, which didn`t return calls for comment, has until July 19th to contest the violations.