California ICC UST Inspector Practice Exam

What is the main requirement for a single-walled tank in a below-grade emergency generator tank system?

1. The structure must allow monthly visual inspections

2. The tank must be visible from the ground surface

3. The structure must retain the entire liquid volume

4. The owner must conduct daily checks

The correct answer is: The structure must retain the entire liquid volume

The primary requirement for a single-walled tank in a below-grade emergency generator tank system is that the structure must retain the entire liquid volume. This is critical because a single-walled tank lacks the additional protective barrier that a double-walled tank offers. Therefore, in the event of a leak or rupture, it is essential that the tank is capable of containing all the fuel it holds. This capacity to retain liquid helps prevent environmental contamination and ensures compliance with safety regulations. Although options such as conducting regular inspections or visibility from the ground surface could be part of a maintenance or monitoring program, they do not address the fundamental safety and environmental containment concerns inherent to single-walled tank systems. Ensuring that the tank can contain all its contents is paramount in mitigating the risks associated with possible leaks.