Which method is commonly used for leak detection in underground storage tanks (USTs)?

Automatic tank gauging is a widely accepted method for leak detection in underground storage tanks (USTs) due to its ability to continuously monitor the liquid levels in the tank. This technology utilizes sensors to measure the levels of product and water in the tank, allowing operators to detect discrepancies that may indicate a leak. The automated nature of this system enhances accuracy and timeliness in identifying potential leak scenarios, thus ensuring environmental safety and regulatory compliance.

In contrast, visual inspection can be subjective and may not detect underground leaks that are not evident on the surface. Manual inventory tracking is also less reliable since it relies on regular data entry and observations, which could lead to human errors or delays in detecting issues. Pressure testing, while effective in certain scenarios, is typically used in specific conditions and may not be as practical for ongoing leak monitoring as automatic tank gauging. The combination of precision and continuous monitoring makes automatic tank gauging the preferred method for leak detection in USTs.