California ICC UST Inspector Practice Exam

Which scenario does NOT require secondary containment testing?

1. Interstitial space hydrostatically monitored

2. Under-dispenser containment

3. Turbine piping sump

4. Secondary piping

The correct answer is: Interstitial space hydrostatically monitored

The scenario where the interstitial space is hydrostatically monitored does not require secondary containment testing because hydrostatic monitoring itself is a method used to ensure the integrity of the containment system. In this method, the interstitial space between the primary and secondary containment is filled with liquid and monitored for any changes in pressure or liquid level. If the monitored liquid level remains stable, it indicates that there are no leaks from the primary containment, which negates the need for additional testing of the secondary containment. In contrast, under-dispenser containment, turbine piping sumps, and secondary piping typically require testing to confirm that their containment features are functioning as intended and can effectively contain any potential leaks or spills. These systems must be regularly evaluated to ensure they are working properly and do not pose a risk to the environment or public safety.