Containment requirements vary by jurisdiction, product and volume, and we are not your compliance advisor. What we can tell you is what our customers actually build, what survives inspection, and what quietly does not.
The general principle
Most schemes want containment capacity equal to the largest single container, plus an allowance — commonly 10% of total stored volume or 110% of the largest unit, whichever is greater. For a single 275-gallon tote that means roughly 300 gallons of containment.
Three hundred gallons sounds enormous until you realise it is a four-inch-deep bund under a 4 by 4 foot footprint plus a modest margin. The volume is achievable; the detailing is where people fail.
Option 1 · Purpose-made spill pallet
A moulded polyethylene sump with a removable grate, sized for one, two or four totes. Expensive per unit, immediately defensible, and movable.
Best for: anything you will be asked about, anything mobile, and any site where the floor is not yours.
Option 2 · Bunded floor area
A kerbed and sealed section of concrete floor with a sealed low point. Far cheaper per gallon of capacity than pallets if you have several totes, and permanent.
The failure mode is sealing. Untreated concrete is not impermeable and a joint through the bund is a leak path. Most of the failed bunds we have seen failed at a construction joint, not at the kerb.
Option 3 · Flexible bund
A folding PVC or polyurethane tray with sprung walls. Cheap, deployable, excellent for temporary sites and for the fuel tote on a job site.
Watch out for UV degradation outdoors and for punctures from fork tips. Inspect them, because they look fine until the day they are needed.
Option 4 · The one we get asked about and caution against
Cutting down a scrap tote to make a tray. People do this, it is cheap, and we fabricate a lot of things from scrap cages — but not this. A cut bottle has no structural rim, no designed capacity, and no documentation, and the volume is almost always short of requirement.
If you want a fabricated containment solution we will build one with a known capacity and a drawing. Improvised ones fail inspections and, more importantly, fail spills.
| Approach | Rough cost per tote | Inspection | Best for |
|---|---|---|---|
| Moulded spill pallet | $$$ | Immediately defensible | Single units, mobile, audited sites |
| Bunded floor | $ at scale | Defensible if sealed properly | Multiple totes, permanent |
| Flexible bund | $$ | Acceptable, inspect regularly | Temporary and job sites |
| Improvised cut tote | — | Usually fails | Nothing |