California ICC UST Inspector Practice Exam

At what percentage of tank volume must the monitor alert when an in-tank probe is used for overfill prevention?

1. 85%

2. 90%

3. 95%

4. 100%

The correct answer is: 90%

The monitor must alert at a level of 90% of the tank volume when using an in-tank probe for overfill prevention. This standard is in place to provide an adequate safety buffer before the tank reaches full capacity. When the tank approaches 90% full, the in-tank probe signals an alert to allow operators enough time to take measures to prevent an overfill situation. This level is strategically chosen because it helps to minimize the risk of spills and environmental contamination while ensuring that there is sufficient time to respond accurately to the alert. Keeping the threshold at this percentage ensures compliance with regulations and safety standards, thus protecting both the facility and surrounding areas from potential hazards associated with overfilling tanks. Reaching the 90% alert level allows for operational safety measures to be implemented before the tank hits critical limits, offering a proactive approach to managing fuel levels.