40 CFR §761.65(c)(6)

Except as provided in paragraph (c)(7) of this section, any container used for the storage of liquid PCBs shall comply with the Shipping Container Specification of the Department of Transportation (DOT), 49 CFR §178.80 (Specification 5 container without removable head), §178.82 (Specification 5B container without removable head), §178.102 (Specification 6D overpack with Specification 2S(§178.35) or 2SL(§178.35a) polyethylene containers) or §178.116 (Specification 17E container). Any container used for the storage of non-liquid PCBs shall comply with the specifications of 49 CFR §178.80 (Specification 5 container), §178.82 (Specification 5B container) or §178.115 (Specification 17C container). As an alternate, containers larger than those specified in DOT Specifications 5, 5B, or 17C may be used for non-liquid PCBs if the containers are designed and constructed in a manner that will provide as much protection against leaking and exposure to the environment as the DOT Specification containers, and are of the same relative strength and durability as the DOT Specification containers.