During a delivery, what must be monitored to prevent overfilling?

Monitoring the maximum allowable delivery volume during a fuel delivery is critical in preventing overfilling of underground storage tanks (USTs). This volume is established based on the tank's capacity and regulatory requirements. Each UST must have a predetermined safe operational limit, and exceeding this limit can lead to spills, environmental contamination, and regulatory penalties.

By keeping a close eye on the maximum allowable delivery volume, designated operators can ensure that no more fuel is transferred into the tank than it can safely accommodate. This helps maintain safety and compliance with environmental standards, preventing issues that could arise from overfilling, such as leaks or hazardous spills.

While other factors, such as tank vacuum pressure, fuel temperature, and the delivery truck's fuel gauge, may be relevant in certain contexts, they do not directly address the specific concern of managing the delivery volume to prevent overfilling. The primary focus should always be on adhering to the established volume limits for each tank during delivery operations.