Modular construction allows containment areas of any size to be configured. Polymer-coated foam support blocks (6 lengths) provide structure to sidewalls - can be driven over repeatedly without damage. Standard materials include 38 mil and 54 mil slip resistant PVC. Triangular-shaped, polymer-coated foam support blocks (72L x 18W x 6H) are used with rebar (not included) to provide sidewall structure. Molded-in slots in top of foam blocks hold rebar - secures material in place. No set-up required once Berm has been positioned in the field.