Secondary containment is used for the containment of liquids preventing contamination or pollution occurring. The use of a spill berm liner for containment of fuel tank leaks, oil spill cleanup, truck wheel washing, HAZMAT chemical spill response and decon pool showers for clean animals, birds or people.

These secondary spill containment berms and liners are used in the oil and gas industry while fraccing, first responders for decontamination of equipment from truck roll overs and spills and containment of chemical spills in factories or work sites. They are portable, flexible and a cost effective solution for pollution control.

http://en.wikipedia.org/wiki/Secondary_spill_containment