How often must UST systems with impressed current cathodic protection be inspected?

For underground storage tank (UST) systems equipped with impressed current cathodic protection (ICCP), regulatory requirements stipulate that these systems must be inspected regularly to ensure their effectiveness in preventing corrosion. The correct interval for such inspections is every 60 days.

Regular inspections every 60 days help to verify that the cathodic protection system is functioning properly and adequately protecting the UST system from corrosion caused by electrolytic activity. This timeframe allows operators to identify any issues early, such as a malfunctioning rectifier or a depletion of current, which could lead to corrosion and ultimately compromise the integrity of the UST.

The options suggesting more frequent inspections, such as weekly or every 30 days, exceed the regulatory minimum and may create unnecessary operational burdens. On the other hand, an inspection every 90 days could potentially allow problematic conditions to go unnoticed for too long, increasing the risk of corrosion damage to the tank and associated piping. Therefore, the 60-day inspection interval strikes a balance between sufficient oversight and operational feasibility.