Identify one maintenance task required for UST systems.

Inspecting and testing the corrosion protection systems is a critical maintenance task required for underground storage tank (UST) systems. This task is essential because USTs often contain hazardous materials, and the potential for corrosion can lead to leaks, which pose environmental and safety risks. Proper corrosion protection ensures that the structural integrity of the UST is maintained, preventing contamination of surrounding soil and groundwater.

Corrosion protection systems typically include features like cathodic protection, which protects metal surfaces through electrochemical methods, and specialized coatings or linings designed to prevent corrosion. Regular inspections and testing of these systems are necessary to verify their effectiveness and ensure compliance with regulatory requirements.

While replacing containment sumps, draining tanks, and conducting customer surveys may all be relevant to the operation of UST systems, they do not specifically address the ongoing protection against corrosion, which is a fundamental aspect of UST maintenance aimed at preventing leaks and safeguarding the environment.