What action must dispatch take after being notified of an emergency evacuation?

In the context of emergency evacuation procedures, dispatch plays a critical role in ensuring clear communication and effective coordination among all responding units and stakeholders. Toning all frequencies for 5 seconds serves as a vital alert mechanism to reach all personnel involved in emergency response. This action helps to quickly notify and mobilize first responders across various channels, allowing them to be aware of the situation and take necessary actions.

Using this method of broadcasting ensures that the message reaches a wide audience, including units that may be on different frequencies or operating in various areas. This rapid communication is essential during an emergency evacuation, where time is of the essence and timely updates can significantly affect response strategies and outcomes.

In comparison, sending additional units to the scene, notifying the Fire Chief, or initiating a city-wide alert, while valuable actions in certain contexts, do not specifically address the immediate need to quickly convey the urgency of the evacuation to all necessary personnel. Each of these may occur in tandem depending on the situation, but the immediate priority is to ensure that all units are informed simultaneously to facilitate an effective response.