California ICC UST Inspector Practice Exam

Which of the following is classified as an Underground Storage Tank?

1. Septic Tank

2. Petroleum Storage Tank

3. Farm Tank

4. Heating Oil Tank

The correct answer is: Petroleum Storage Tank

An Underground Storage Tank (UST) is defined as a tank that is at least 10% below ground and is used for storing regulated substances. The classification of a petroleum storage tank as an UST is due to its primary function of storing petroleum products, which are regulated under specific environmental laws to prevent leakage and groundwater contamination. Petroleum storage tanks often require adherence to strict standards and monitoring requirements to ensure that they do not leak harmful substances into the surrounding environment. In California, the regulation of USTs is particularly critical due to the state's ongoing efforts to protect its water resources and maintain environmental safety standards. In contrast, while septic tanks and farm tanks may be underground, they typically do not fall under the same regulatory framework as petroleum storage tanks. Septic tanks are designed for the treatment of wastewater, while farm tanks can vary widely in function and may not necessarily store regulated substances subject to the strict guidelines that apply to USTs. Heating oil tanks can sometimes be above ground and may not meet the specific definitions or criteria needed to be classified as USTs under California law. Thus, the classification of the petroleum storage tank as an UST is accurate due to its regulation under laws designed to manage potential environmental impacts.