California ICC UST Inspector Practice Exam

Which piece of information is NOT required on the exterior label of an underground storage tank?

1. Design pressure in psig

2. Usable capacity in gallons

3. Width of the interstitial space

4. Identity of manufacturer

The correct answer is: Width of the interstitial space

The requirement for the information displayed on the exterior label of an underground storage tank is grounded in the need for clarity and safety regarding the tank's characteristics and specifications. The design pressure in psi, usable capacity in gallons, and identity of the manufacturer are critical details that help ensure the safe operation and maintenance of the tank, as well as provide essential information to inspectors and responders in case of an emergency. The design pressure in psig indicates the maximum pressure the tank can safely withstand, which is crucial for preventing structural failures. Usable capacity informs operators of the volume of liquid that can be stored without risk of spillage or overfilling, which is vital for adhering to regulations and environmental protections. The identity of the manufacturer provides a point of contact for warranty or product-specific information, which can be important during inspections or repairs. In contrast, the width of the interstitial space is not typically required on the exterior label. While the interstitial space itself is important for monitoring leak detection systems and ensuring the integrity of the tank, specifying its width does not provide immediate operational guidance or critical safety information in the same way the other listed details do. Therefore, this particular piece of information is considered non-essential for the label, which is why it is not included among