The Environmental Protection Agency (EPA) provides volume requirements for secondary containment systems in the Resource Conservation and Recovery Act (RCRA) found in Title 40 CFR 264.175(b). According to the RCRA act, containment systems must be designed as follows:
The containment system must have sufficient capacity to contain 10% of the volume of containers or the volume of the largest container, whichever is greater. Containers that do not contain free liquids need not be considered in this determination.
Run-on into the containment system must be prevented unless the collection system has sufficient excess capacity to contain any run-on which might enter the system. Excess capacity must be in addition to the 10% of the volume of containers or the volume of the largest container, whichever is greater.