What does the term "sump" refer to in underground tank systems?

The term "sump" in underground tank systems specifically refers to a depression or pit designed to collect leaks for monitoring purposes. Sumps are critical components in the management of underground storage tanks because they help capture and contain any leaks or spills that may occur, facilitating early detection and response to potential environmental contamination issues. By collecting leaked substances, sumps allow for monitoring and maintenance, ensuring compliance with environmental regulations and enhancing safety measures.

The other options, while related to tank systems, do not accurately define what a sump is. For instance, a type of tank for storing hazardous materials does not encompass the function of leak collection and monitoring that a sump serves. A system for filtering tank contents pertains to cleaning or purity processes rather than leak detection. Lastly, a method for accident prevention refers broadly to safety procedures rather than a specific physical structure designed for leak management.