If the ISO determines that response activities pose an imminent threat, what action must be taken?

When the Incident Safety Officer (ISO) identifies that response activities present an imminent threat, the appropriate action is to halt or suspend the response operation and notify the Incident Commander (IC). This decision is critical because the primary responsibility of the ISO is to ensure the safety of all personnel involved in the response activities. If an imminent threat is confirmed, immediate action is necessary to prevent harm to responders and potentially avoid escalating the situation.

By suspending operations, the ISO effectively prioritizes safety over ongoing activities, which could otherwise lead to injuries or fatalities. Notifying the IC is essential to ensure that leadership is aware of the situation and can make informed decisions about how to proceed, including reevaluating the risks and implementing response adjustments or additional safety measures. This sequence of action demonstrates a proactive approach to incident management, reinforcing the importance of safety protocols in high-risk situations.