Hazardous Materials Emergencies, Spills, and First Response
What this domain tests
This domain tests first response to hazmat emergencies: spills, leaks, fires, and unknown materials. The exam expects scene safety, correct notification, and use of the Emergency Response Guidebook before anyone tries to stop the leak.
Core rules
- Stop, secure the scene, and approach from upwind. Keep ignition sources away and do not walk into vapor, liquid, or smoke.
- Identify the material from the shipping paper, placard, label, or UN/NA number, then use the ERG guide. The ERG gives initial isolation and protective-action distances; those are starting points, not a cleanup plan.
- Use the level of PPE and training you actually have. Untrained drivers should not attempt rescue or containment.
- Notify 911, the carrier, and the National Response Center at 1-800-424-8802 when the release is reportable. Give location, material, quantity, injuries, and hazards.
- Do not use water on water-reactive materials, and do not mix clean-up materials unless the ERG or a qualified responder says to.
Worked example
A driver sees liquid dripping from a drum marked with a flammable liquid placard. The driver should park away from the leak, keep people back, eliminate ignition sources, check the shipping paper for the UN number and name, and use the ERG guide for initial isolation. The driver calls 911 and the carrier; if the release meets reporting criteria, the driver or carrier calls the NRC. The driver does not try to plug the drum with a rag or drive on.
Traps
A placard shows a hazard class, not necessarily the exact material. ERG distances are initial isolation, not the final evacuation zone. Do not re-enter a closed area to retrieve paperwork. Do not assume a small puddle is harmless.