Which of the following is NOT included in annual tests for UST systems?

The correct answer identifies the spill bucket inspection as not being included in the annual tests for underground storage tank (UST) systems. While the spill bucket inspection is a critical maintenance procedure, it is typically conducted more frequently than annually, often as part of each delivery or refueling. This is to ensure that any spilled product is detected and managed promptly to prevent environmental contamination.

In contrast, line tightness testing, cathodic protection system annual tests, and automatic line leak detector operability tests are all part of the regulatory requirements that mandate annual testing to ensure the integrity and safety of UST systems. These tests help in detecting leaks and ensuring that the systems are functioning properly, adhering to safety standards, and meeting compliance requirements.

Therefore, in the context of routine maintenance and testing of UST systems, the spill bucket inspection is not part of the annual testing regimen, as its frequency and urgency stem from the need to respond immediately to potential issues during operations.