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Secondary containment is also required for tanks. The containment must prevent releases to the environment due to tank failure or accidental spills such as overfilling the tank. A leak detection system is also required. Acceptable containment options are: liners, vaults, or double-walled tanks. An external liner must be made from an impervious material. The liner can be used as containment for more than one tank, but it must be capable of holding 100% of the largest tank within its boundary, plus the amount of rain from a 25-year, 24-hour storm event. Tanks can also be located in underground chambers or vaults. Most vaults are made of concrete and lined on the inside and outside to prevent waste from escaping or water from entering the vault, because concrete is porous.