During a hazardous materials incident, which of the following actions is not typically associated with the incident commander's responsibilities?

Answer: D — Overseeing financial expenditures

The role of the incident commander in a hazardous materials incident primarily includes responsibilities focused on the immediate management and operation of the response to ensure safety and effectiveness. Establishing the command structure, managing public relations, and directing on-scene operations fall squarely within the scope of the incident commander's duties. They are essential for coordinating resources, communicating effectively with the public and other stakeholders, and overseeing the tactical response to the incident. Overseeing financial expenditures, however, does not typically align with the incident commander's responsibilities during a hazardous materials event. Financial oversight is more likely to be handled by administrative personnel or financial officers within the organization’s overall response plans. This functional distinction is critical, as the incident commander needs to focus on real-time incident management rather than budgetary concerns, which can be addressed at a later stage or by a different team altogether.