California ICC UST Service Technician Practice Exam

What is the minimum fill level during the previous month required for monthly leak detection testing?

1. 5%

2. 10%

3. 15%

4. 20%

The correct answer is: 10%

For monthly leak detection testing, the minimum fill level required during the previous month is 10%. This standard is crucial for ensuring accurate and reliable leak detection. When the fill level is maintained at 10% or higher, the equipment and monitoring systems can effectively identify potential leaks in the underground storage tank (UST) system. A lower fill level may not provide sufficient data or adequate conditions to detect small leaks, as fluctuations might easily fall below the detectable threshold. Maintaining a minimum fill level allows for consistent readings and reduces the risk of false negatives, ensuring that any potential leaks are identified and addressed promptly, thereby protecting the environment and public safety.