When should the HMTU establish a rescuer decontamination area?

The correct answer indicates that the HMTU (Hazardous Materials Tactical Unit) should establish a rescuer decontamination area prior to entry to the hazardous zone. This is crucial for ensuring the safety of responders. By setting up a decontamination area beforehand, the HMTU ensures that there is a controlled environment ready for decontamination processes as soon as responders leave the contaminated zone.

This proactive approach minimizes the risk of cross-contamination and protects not only the responders but also the civilians and the environment from hazardous materials. Proper planning allows for immediate and effective decontamination, which is essential during emergencies involving hazardous substances. Establishing the area before entry also helps in streamlining the response efforts, as responders know the exact procedures and locations for decontamination once they complete their tasks.

In contrast, establishing the area after the incident is resolved would delay the necessary safety measures and could result in contamination spread. Only creating the area if there are multiple victims overlooks the potential hazards faced by any rescuer. Waiting until after exiting the site adds unnecessary risks, as contaminants could spread during the time it takes to set up the decontamination area.