"Federal requirements established by the Occupational Safety and Health Administration (OSHA) of the U.S. Department of Labor (DOL) in 29 Code of Federal Regulations (CFR) 1910.120 Hazardous Waste Operations and Emergency Response require that the individual in charge at a hazardous materials emergency must be able to identify, to the extent possible, all hazardous substances or conditions present and must address as appropriate site analysis, use of engineering controls, maximum exposure limits, and hazardous substance handling procedures. Furthermore, the IC [Incident Commander] is responsible for assuring that the personal protective equipment (PPE) worn is appropriate for the hazards to be encountered. To fulfill that obligation, the IC must implement a process commonly referred to as a hazard/risk assessment."
Coffee Break Training - Hazardous Materials Series No. HM-2012-1
United States Fire Administration: http://www.usfa.fema.gov/