Which activity is not required on a monthly basis at a UST facility?

Reviewing fuel delivery records is not a monthly requirement at a UST facility. This activity is typically done less frequently, such as on an annual basis or as needed, primarily to ensure compliance with operational standards and to track inventory.

In contrast, the other activities listed are critical for maintaining the safety and functionality of the underground storage tanks. Inspecting tank linings is essential to prevent corrosion and leaks, which pose environmental hazards. Checking leak detection systems regularly ensures that any potential leaks are identified promptly, mitigating risks to groundwater and human health. Testing for groundwater monitoring is crucial to detect any contaminant migration and to ensure that the surrounding environment remains protected from potential contamination due to UST operations.

Thus, while all activities mentioned are important for effective UST management, only reviewing fuel delivery records does not need to happen on a monthly basis.