In solid waste materials landfill sites leachate is the most significant problem in terms of environmental pollution. It is essential to block leachate before it reaches saturated layer or ground water level. To prevent this storage soil is made impermeable. Natural and crumpled clay used in sanitary landfill areas is usually used as ceiling or floor cover or in formation of side banks. Clay soil layers are employed effectively in blocking polluters such as leachate and organic liquids. According to previous researches the structure of soil is destroyed due to the leachate through and thus there have been alterations in permeability of the soil.