California ICC UST Inspector Practice Exam

Which option is NOT an approved overfill protection device for a UST system with vent or tank riser piping that has secondary containment?

1. Alert the operator when the tank is 90% full by restricting the flow into the tank.

2. Provide positive shut-off of flow to the tank when it is filled to 95% capacity.

3. Restrict delivery of flow to the tank at least 30 minutes before overfilling.

4. Alert the transfer operator when the tank is 98% full by activating an alarm.

The correct answer is: Alert the transfer operator when the tank is 98% full by activating an alarm.

The correct answer is based on understanding the requirements for overfill protection devices in underground storage tank (UST) systems. Overfill protection is crucial for preventing spills and ensuring safe operation during tank filling. Option D does not align with the approved practices because it only activates an alarm when the tank reaches 98% capacity. While alarming is a component of safety measures, simply alerting at this high fill level does not facilitate an active preventive measure to avoid overfilling. The best practices advocate for systems that take action before the tank reaches such a critical point. In contrast, the other options describe proactive measures that are part of the accepted overfill protection guidelines. They either restrict the flow into the tank or provide a mechanism for shutting off the flow before reaching a dangerous capacity, ensuring that overfilling is actively mitigated before it happens. Understanding these nuances is essential for effective compliance and safety in UST management.