California ICC UST Inspector Practice Exam

What is the primary function of interstitial monitoring in underground storage tanks?

1. To detect leaks in the under-dispenser containment

2. To detect the presence of liquid between the primary and secondary containment

3. To monitor tank volume

4. To regulate fuel flow to the dispenser

The correct answer is: To detect the presence of liquid between the primary and secondary containment

The primary function of interstitial monitoring in underground storage tanks is to detect the presence of liquid between the primary and secondary containment. This monitoring system serves as a critical safety feature to identify any leaks that could occur in the primary containment, which holds the hazardous materials, such as petroleum products. When liquid is detected in the interstitial space, it indicates that there may be a breach in the primary containment, allowing potentially hazardous substances to escape. By utilizing interstitial monitoring, operators can take timely action to address any leaks and prevent environmental contamination. This system enhances safety and compliance with regulatory requirements, making it an essential component of underground storage tank management. Other options relate to functions that are important in tank operation but do not specifically pertain to interstitial monitoring. For example, detecting leaks in under-dispenser containment focuses on a specific area of the system, while monitoring tank volume and regulating fuel flow pertain more to operational and functional aspects of fuel management rather than leak detection in containment.