Portable secondary containment berm for drums, frac tanks, equipment and vehicles. The Ultra-Containment Berm, Stake Wall Model is a portable berm that helps capture leaks, drips, and spills to prevent them from contaminating and polluting the environment. The Stake Wall Models design features flexible polyurethane stakes that allow the sidewalls to spring into place automatically even after being bent in either direction. This makes it perfect for spill sites or containment areas because it allows drums and trucks to roll over the walls without breaking their upright structure.