What is the required action to ensure safety at the entrance of a hazardous materials incident?

To ensure safety at the entrance of a hazardous materials incident, isolating the perimeter and restricting access is a critical action. This approach effectively controls who enters and exits the area, preventing unauthorized personnel from potentially exposing themselves to hazardous materials. Establishing a controlled perimeter helps to minimize the risk of further contamination and danger to responders and the public. It allows for a safe working area for emergency responders to manage the situation without additional exposure risks.

While providing medical aid, setting up decontamination equipment, or establishing training areas are indeed important actions in the overall management of a hazardous materials incident, they come after ensuring that the perimeter is secure. Without proper isolation of the area, these actions cannot be conducted safely. Thus, establishing a perimeter not only protects the public and responders but also sets the foundation for effective incident management and response.