A typical plan of action is NOT based on which of the following?

A typical plan of action relies heavily on various elements crucial for effective response to hazardous materials incidents. The incident commander's knowledge of the hazardous materials behavior model is integral to developing a response strategy, as it informs how different substances behave in various environments and under certain conditions. Understanding this behavior allows for the prediction of potential risks and necessary safety measures, making it a foundational component of any response plan.

In contrast, the other elements listed are also essential but serve different roles. Knowledge of response team members can help in optimizing resource allocation and task management during an incident. The assessment of surroundings provides critical situational awareness that informs safety measures and operational decisions. Historical incident data can guide planners based on past occurrences, helping to anticipate challenges and refine strategies.

Therefore, while the incident commander's understanding of hazardous materials behavior is vital, the statement regarding it being not a basis for a typical plan of action misunderstands its core importance in shaping an effective and safe response plan.