California ICC UST Inspector Practice Exam

Which of the following best describes an underground storage tank?

1. A tank located completely above ground

2. A tank that is stationary and contains hazardous substances

3. A tank not subject to any regulatory control

4. A portable tank containing non-hazardous liquids

The correct answer is: A tank that is stationary and contains hazardous substances

An underground storage tank is best described as a stationary tank that contains hazardous substances. This definition encompasses the regulatory context in which these tanks operate, as underground storage tanks (USTs) are designed to store liquids that could impact the environment if not managed properly. The emphasis on being "stationary" indicates that these tanks are fixed installations, typically buried beneath the surface to prevent exposure and potential contamination. This characterization aligns with environmental laws and safety regulations that govern the design, installation, and monitoring of these tanks to mitigate risks associated with leaks or spills. Additionally, a focus on hazardous substances highlights the potential dangers these tanks pose if not appropriately maintained, reinforcing the importance of compliance with regulatory oversight to protect public health and the environment. While the other options describe attributes that do not apply to underground storage tanks, this choice effectively encapsulates the essential aspects of USTs in both a practical and regulatory sense.