A method of preventing material from entering the environment should the primary container fail. Some secondary containment devices are available from the Environmental Division.
As used in HRS Table 3-2, secondary containment is applicable to the evaluation of the containment factor for tanks. Methods of secondary containment include a liner external to the tank, a vault, a double-walled tank, or an equivalent device approved by EPA.
In the case of a UST, the erection of a physical barrier completely around the primary product- containing underground storage tank. The containment may consist of a second tank wall, a vault, or a liner.
A system such as a sealed basin and dike that will catch and hold the contents of a tank if it leaks or ruptures.
Structures, usually dikes or berms, surrounding tanks or other storage containers and designed to catch spilled material from the storage containers.
A container or structural barrier placed under or around a vessel to contain the contents of the vessel in the event of an accidental spill or leak. The secondary containment should have at least 110% of the primary vessel’s capacity.
A container or other containment (e.g. bermed area) which is capable of holding the hazardous contents of a primary container should it fail.
Impermeable floor and walls around a chemical storage area that minimize the amount of chemical seeping into the ground from a spill or leak.
Any structure, such as a dike, built around a chemical storage area to reduce the amount of material that could reach soil or water in the event of a spill or leak.
