Hazardous Materials Awareness and Operations
Hazardous Materials Awareness and Operations tests recognition, isolation, notification, and defensive control at a release. You are not expected to be a technician; you are expected to recognize the hazard, protect people, and call for the right resources.
Core rules and concepts
- DOT hazard classes: 1 explosives, 2 gases, 3 flammable liquids, 4 flammable solids, 5 oxidizers, 6 toxic, 7 radioactive, 8 corrosive, 9 miscellaneous.
- Use the ERG: identify the UN number or placard, find the guide page, then apply Table 1 isolation and protective clothing recommendations. Unknown materials get an initial isolation and upwind approach.
- Establish hot, warm, and cold zones. Only trained and equipped personnel enter the hot zone; operations-level responders work defensively from the warm zone.
- Structural firefighting PPE is not chemical protective clothing. Match Level A, B, C, or D to the ERG and hazard.
- Notify dispatch, hazmat, CHEMTREC, and environmental authorities. Control ignition sources and prevent runoff from entering drains.
- Defensive actions include diking, damming, absorbing, and shutting off remote valves if trained; do not contact the product.
Worked example
A tanker rolls over and leaks a liquid toward a storm drain; the placard reads 1203. Approach uphill and upwind, park at a safe distance, and identify gasoline from the ERG. Establish initial isolation per the guide, eliminate ignition sources, notify hazmat, and dike with absorbent from the warm zone. Do not flush the product into the drain. Reasoning: gasoline is a flammable liquid with vapor explosion risk; isolation protects civilians, and diking prevents water pollution. Water spray may disperse vapors but must not spread product.
Traps that cost marks
- Walking up to read a placard before isolating.
- Using water on an unknown material.
- Entering the hot zone in turnout gear.
- Ignoring wind direction or drainage.
- Assuming a missing placard means no hazard.