Identify one key aspect of controlling a HazMat scene.

Establishing a command post and maintaining clear communications is a crucial aspect of controlling a HazMat scene. A well-defined command post allows for organized incident management, ensuring that all responding personnel understand their roles and responsibilities. Clear communication is vital during a HazMat incident, as it helps coordinate the efforts of different agencies, relay important information regarding the hazards present, and keep all personnel safe by sharing real-time updates on the evolving situation.

This aspect underlines the importance of structured leadership and collaboration, which are essential in the complex environment of a HazMat incident. In contrast, limiting personnel to only firefighters can restrict necessary support from specialized teams. Automatically initiating evacuation without assessment might leave behind individuals who could be safely managed on-site. Additionally, using water to extinguish visible fires may not be appropriate for all HazMat situations, as introducing water could react adversely with certain hazardous materials, potentially causing further complications.