Section 30.685 - Management of Containers(1) A container holding hazardous waste shall always be closed during storage, except when waste is being added or removed. In the event that Federal, state or local law or regulation requires a container to be vented, the container shall be vented only through devices such as pressure relief valves that satisfy ASTM or fire prevention standards (as opposed to open venting) and only in a manner that does not present a threat to public health, safety, or welfare or the environment.(2) A container holding hazardous waste shall not be opened, handled or stored in a manner which may rupture the container or cause it to leak. If containers are stacked, they shall be stacked in a manner that allows the containers to be easily and safely inspected, and pallets shall be used to separate the containers.(3) Aisle spacing for container storage of ignitable or reactive hazardous waste shall meet the guidelines set forth in the National Fire Protection Association's Flammable and Combustible Liquids Code (NFPA-30, Chapter 4) 2003 Edition.(4) Aisle spacing for container storage of hazardous waste shall be such that the owner or operator or the Department can inspect each row of containers to ensure compliance with 310 CMR 30.680.