- Ground water cut-off walls refer to a wide variety of techniques to construct low hydraulic conductivity subsurface barriers or deviations
- Cut-off walls can be installed to contain, capture or redirect groundwater flow in the vicinity of the site for the control of contaminant migration
- Typical cut-off walls employ a slurry wall construction methodology with soil bentonite backfill. Less common slurry wall backfills include cement bentonite (CB), soil attapulgite (SA) and concrete (plastic or diaphragm). Ground water cut-off walls may also be constructed using various grouts or soil mixing technology. While grouting may be used to create horizontal barriers to seal the base of contaminent site, soil mixing technologies such as Cutter Soil Mixing (CSM) offer high quality mixed in-situ walls.
Featured Cut-Off Projects
Fantasy Gardens Mixed-Use Development
Richmond, BC Canada
Fantasy Gardens is a mixed-use development which includes a common parkade supporting several mid-rise buildings. One building is designed with a second basement level and requires dewatering during construction. Due to the groundwater’s high iron content, the Owner has requested to significantly reduce the amount of dewatering required and the associated water treatment costs. To address this issue, the Engineer...
Vale Nickel Mine
The cut off wall was one part of the remediation project of the Vale mine in Thompson. In order to prevent the tailings from producing acid while reacting with the air, water has to cover them. As a consequence, the tailings dam needed to be raised and also needed to become an impervious dam to hold a hydraulic water head...