Soil-bentonite slurry wall.
Slurry walls comprised of a soil-
bentonite mixture are by far the
most commonly used cutoff
walls for environmental
applications. They are the least
expensive to install, have very
low permeabilities, and are
chemically compatible for
withstanding various dissolved-
phase contaminants. Construc-
tion of the wall is fairly
straightforward (Figure 1). The
bentonite slurry is introduced
into the trench as soon as
excavation begins. Excavated
backfill can be mixed with water
and bentonite.