The ERT must, at minimum, respond in which manner to hazardous substance releases?

The Emergency Response Team (ERT) must respond defensively to hazardous substance releases to ensure safety and minimize risks. A defensive response involves taking actions that protect the team and the public from exposure to hazardous materials, often through containment and control measures rather than direct confrontation. This approach helps to stabilize the situation while mitigating the potential impact of the release.

In contrast to proactive, passive, or indirect responses, a defensive stance is critical during the initial stages of a hazardous incident where conditions might still be unstable. The team's focus is on assessing the situation, maintaining safe distances, implementing control measures, and coordinating with other emergency responders to address the incident effectively. This method emphasizes the importance of safety for both responders and the surrounding community while managing the hazard.