When should relay pumper evolutions be shut down?

In relay pumper operations, shutting down the evolution should be conducted by the on-scene pumper first. This is crucial because the on-scene pumper is directly engaged in the firefighting efforts, assessing the situation and ensuring that adequate water supply and pressure are maintained for firefighting operations.

If the on-scene pumper were to shut down without confirming that water needs are met or that firefighting operations can safely continue, it could lead to critical issues such as water loss during a firefighting operation, risking the safety of both firefighters and civilians. Therefore, the on-scene pumper has the responsibility to evaluate the ongoing requirements before any other pumpers in the relay are instructed to cease operations.

Other options may suggest various conditions under which relay operations can be stopped, but they do not prioritize the safety and situational awareness that the on-scene pumper must maintain during fire suppression activities. This understanding reflects the importance of communication and awareness in fire service operations.