Also, because the excavated soil is not used as backfill, it will need to be disposed of at additional cost.
Moreover, because the cement-bentonite slurry wall does not contain many solids, the wall is composed mostly of water and therefore has a higher permeability and is more prone to permeation by contaminants.
Advantages of the cement-bentonite slurry wall include greater strength and the ability to be installed in areas with extreme topography.