What are the three modes of operations in a hazardous materials incident?

The three modes of operations in a hazardous materials incident are offensive, defensive, and non-intervention. In the offensive mode, responders actively engage in mitigating the hazard and controlling the situation. The defensive mode focuses on protecting people, property, and the environment from the hazardous materials without direct intervention. Non-intervention entails evacuating the area and allowing the situation to stabilize on its own, typically used when the risk to responders is too high.