Define "spillage" in terms of UST operations.

In the context of Underground Storage Tank (UST) operations, "spillage" refers specifically to the overflow or leak of fuel during the transfer process. This definition encompasses incidents where fuel may escape from a tank or during the transfer from one vessel to another, potentially leading to environmental contamination and safety hazards. Managing spillage is crucial for compliance with regulations and for protecting groundwater and surrounding ecosystems.

Understanding the nature of spillage helps operators recognize the importance of proper equipment maintenance and the implementation of safety protocols during fuel transfer operations to prevent leaks and spills. This acknowledgment aligns with regulatory requirements aimed at minimizing the environmental impact of UST systems.

The other options do not accurately capture the essence of spillage. For instance, evaporation pertains to the loss of fuel as vapor and does not involve the physical transfer of liquid; waste fuel collection implies management of used or excess fuel rather than accidental loss; and drainage of excess fluids suggests a controlled process rather than an uncontrolled spill. These distinctions are vital for ensuring clarity about UST operations and maintaining compliance standards.