California ICC UST Inspector Practice Exam

Which of the following is a method for leak detection in tanks?

1. Regular tank cleaning

2. Primary containment inspection

3. Statistical inventory reconciliation

4. Manual gauging

The correct answer is: Statistical inventory reconciliation

Statistical inventory reconciliation is a recognized method for leak detection in tanks, particularly in the context of underground storage tanks (USTs). This method involves comparing the amount of product put into the tank with the amount of product withdrawn over a specific time period. By applying statistical techniques, operators can identify discrepancies that may indicate leaks. This process gathers data on product levels and sales while accounting for variables such as deliveries and fluctuations in inventory levels. If the statistical analysis reveals an unusual pattern or discrepancy, it suggests a potential leak that necessitates further investigation. Regular tank cleaning, primary containment inspection, and manual gauging, while valuable practices in their own right, do not serve as formalized statistical methods for leak detection. Regular tank cleaning is more about maintenance than leak detection. Primary containment inspection focuses on the physical integrity of the outer tank structure but doesn't quantify potential losses due to leaks. Manual gauging, while providing a snapshot of liquid levels, lacks the statistical rigor needed to reliably detect leaks over time. Thus, statistical inventory reconciliation stands out as the most effective and methodical approach to identifying leaks in tank systems.