(a) Within 48 hours after the occurrence of an employee accident that directly or indirectly involves chemical exposure or that involves asphyxiation, and that is fatal to one or more employees or results in the hospitalization of five or more employees, the employer of any of the employees so injured or killed shall report the accident either orally or in writing to the department.
(b) The report to the department shall relate the circumstances of the accident, the number of fatalities, and the extent of any injuries. If it is necessary to complete the investigation of an incident, the department may require additional reports in writing as necessary.