What characterizes an "aboveground storage tank"?

An aboveground storage tank is characterized by its placement above the surface of the ground and its function of holding regulated substances. These tanks are typically utilized for the storage of liquids such as fuels, oils, or chemicals that have the potential to be hazardous. The defining feature of an aboveground tank is its location; unlike underground tanks, which are either fully or partly buried, aboveground tanks are elevated and visible, allowing for easier inspection and access. This visibility can be critical for safety and maintenance, as it facilitates monitoring for leaks and other issues.

While some other choices mention characteristics that can apply to types of tanks, they do not specifically define what an aboveground storage tank is. For example, tanks that are partly buried or portable may not meet the specific criteria for classification as aboveground storage tanks, which must be entirely above ground for regulatory purposes. Furthermore, the material from which a tank is made may vary widely and does not define its classification as aboveground or underground. Therefore, the true essence of an aboveground storage tank is its location and ability to contain regulated substances, making option B the most accurate characterization.