Under California law, how is a "small UST" defined?

Under California law, a "small UST" is defined as tanks with a capacity of less than 1000 gallons that are specifically used for heating oil or emergency generators. This definition is important because it provides a clear threshold that distinguishes small underground storage tanks from larger tanks, which may be subject to different regulations and environmental controls.

Small USTs are often associated with specific uses, such as providing heating oil to residential properties or serving as backup fuel sources for emergency generators. By clearly delineating the conditions under which tanks qualify as "small," regulations can be tailored to ensure safety and compliance tailored to these specific uses. Additionally, this definition allows regulatory agencies to better monitor and manage environmental risks associated with fuel storage, particularly in residential areas where leaks or spills can have significant impacts.

The other choices do not accurately capture the legal definition of a "small UST," focusing on various characteristics that are not part of the official criteria under California law. For example, the capacity threshold and the designated use for heating oil or emergency generators are key elements that must be met for classification as a small UST.