What is one common indicator of a leak in an UST system?

A drop in the tank's product level that cannot be accounted for is a common indicator of a leak in an underground storage tank (UST) system because it signifies a loss of product that cannot be explained by normal usage or evaporation. When all usage data and delivery logs are reviewed, any unexplained decrease in the liquid level often suggests that the fuel is escaping from the tank, potentially into the surrounding soil or groundwater.

This situation is particularly concerning as it directly points to the risk of environmental contamination and underscores the importance of prompt investigation and remediation. Regular monitoring of fuel levels is essential in UST management to ensure that any discrepancies are identified and addressed quickly.

While the other options may indicate a problem, they do not serve as direct indicators of a potential leak in the same manner. Increased fuel pump efficiency, for example, might reflect a change in pumping dynamics due to other factors, and higher than normal product pressure could indicate operational issues unrelated to leakage. Similarly, an unusual smell around the tank might suggest issues, but it does not directly signify a measurable leak without further investigation.