(applies to all systems installed after May 23, 2008)

Examples of secondary containment:

• Double-wall tank
• Double-wall piping
• Under-dispenser containment (dispenser sump )
• Submersible turbine pump sump

Instances where secondary containment is now required:

• Any new tank installation
• Any new piping installation
• Any new dispenser installation
• A replacement tank
• A replacement of an entire piping run
• A replacement dispenser ( exception: a replacement suction dispenser where no change to piping occurs )
• Piping repairs over a consecutive 12-month period that equals more than 25 percent of the existing piping run

Secondary containment systems must:

• Contain all regulated substances released from a UST system until they are detected and removed.
• Prevent a release of a regulated substance to the environment at any time during the operational life of the UST system.
• Be monitored monthly for a release using interstitial monitoring.