California ICC UST Inspector Practice Exam

When temporarily closing an underground storage tank system, which of the following isNOT a requirement?

1. All residual liquids must be removed.

2. Maintain corrosion protection.

3. Cap and secure the vent line.

4. Invert the tank if it contained a hazardous substance.

The correct answer is: Invert the tank if it contained a hazardous substance.

In the context of temporarily closing an underground storage tank (UST) system, the requirement to invert the tank if it contained a hazardous substance is not standard practice. While all other options focus on necessary safety and environmental protections, inverting a tank is not a recognized method of closure. Proper procedures for closing a UST system temporarily typically require the removal of all residual liquids to prevent leaks, maintaining corrosion protection to safeguard the tank structure during the closure period, and capping and securing the vent line to prevent potential emissions. These steps ensure that the tank does not pose a risk to the environment or public health during the closure phase. Inversion of the tank is not an established requirement in UST management, making this option out of place in the context of temporary closure regulations.