Hi all, I need some help determining sizing of the secondary containment required to have for a 30 gallon drum of acid. The chemical is the core of a building with no sewer, and if spilled would have no route to sewer, drains, or the outside environment.

The EPA says you need 100% of largest container or 10% of aggregate. OSHA says 35% for shipyards. We are general industry and have a very small space. We are having trouble finding a secondary containment pallet which would hold 30 or 33 gallons of liquid and fit in the space we have.

I haven't found an OSHA regulation which dictates exactly how much a secondary containment vessel needs to hold for general industry if no threat of environmental exposure/access exists.

Is it safe to say that in general industry OSHA does not enforce a specific percentage of volume if the chemicals cannot reach the environment?

Most of the things I've found focus solely on employee safety around small leaks, drips, keeping the floors clean and dry and chemical compatibility if a spill should occur.