California ICC UST Inspector Practice Exam

What is the primary purpose of interstitial monitoring?

1. Detect leaks in the UDCs

2. Monitor tank volume

3. Detect a breach in the primary and/or secondary containment

4. Regulate fuel flow to the dispenser

The correct answer is: Detect a breach in the primary and/or secondary containment

The primary purpose of interstitial monitoring is to detect a breach in the primary and/or secondary containment. In underground storage tank (UST) systems, interstitial monitoring involves the use of a monitoring space that exists between the primary tank and the secondary containment structure. This gap can be filled with fluid or air, and any changes in pressure or the presence of liquid can indicate that a leak has occurred in the primary tank or that there is a failure in the containment system. This method is critical for environmental protection, as it allows for early detection of leaks before they can escape into the surrounding soil or groundwater. Timely identification of such breaches is vital in preventing contamination and adhering to regulatory compliance standards. Monitoring the integrity of both the primary and secondary containment is essential for the safe operation of UST systems, ensuring that risk to public health and the environment is minimized.