Vertical Barriers in Soil for Pollution Containmentby Christopher R. Ryan, Geo-Con Inc, Pittsburgh, PA, USA,
Abstract: Vertical barriers have evolved over the past fifteen years into a technique that is widely applied to restrict the underground movement of liquid wastes and polluted groundwater. Most applications are slurry cut-off walls, although there are several other techniques such as composite slurry walls and soil-mixing walls which show promise. Vertical barriers are used in applications both for new sites and for remediation of polluted sites. In both cases, the vertical barriers may be only one part of the remedial process and may be combined with other containment systems such as liners, or with remedial techniques such as leachate collection and treatment to provide a complete system. A case study is presented that describes a project where bentonite was determined to be unsuitable as an additive. Attapulgite was substituted for the bentonite and the project successfully constructed.
Subject Headings: Soil pollution | Water pollution | Permeability (soil) | Slurry walls | Soil water | Slurries | Core walls | Remediation
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