Groundwater cut-off walls


In the context of soil and groundwater remediation, cut-off walls are among the most cost effective in-situ risk mitigation solutions that can be rapidly installed to contain or redirect groundwater contamination in an aquifer. These structures can be made from soil-bentonite, cement-bentonite or soil-cement-bentonite.

Installation process


Typically built using a material with a conductivity or permeability of at least one order of magnitude less than the natural material present on site. Since groundwater follows the path of least resistance, cut-off walls are most effective when installed directly on a low permeability confining layer, typically bedrock.

Grid patterns



A wall-type installation may be used as a preventative measure to redirect groundwater flow away from a sensitive area. This grid pattern can also be used when installing a serviceable PRB in a “funnel” and “gate” combination.



Also known as in-situ stabilization (ISS), is a preventative measure used to contain (or stop) the spreading of contaminants from the source zone.


The most watertight and cost-effective method used to install slurry walls include filling an excavated trench with a soil-bentonite or cement-bentonite slurry. Installation depth is limited to the excavator’s boom reach (approx. 25 m) from the excavating surface.


Soil mixing vertical augers in a wall-type grid pattern can also be used to install a slurry cut-off wall by overlapping columns to ensure watertight build. This method generates little surface spoils, ideal to combat Ontario’s new “Excess Soils” regulation. REMEA’s vertical augers can reach depths of 25m.


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