According to the rules governed by the EPA’s SPCC, you must ensure your containment area has enough capacity to contain at least 10% of the total volume of the primary containers, or 100% of the volume of the largest container, whichever is greater. You would need to engineer the volume of liquid that fits into the square foot area you have to work with. If you need help, please give one of our specialists a call. For a rough estimate of the height and containment berm needed, contact us for our spreadsheet.