3. Vertical confinement
The containment techniques presented below call for fairly substantial means of implementation, which are justified for a minimum volume of polluted soil, below which excavation operations are generally more appropriate.
The limits in terms of depth and surface area are given in the figure 6 for information purposes, depending on the presence or absence of a water table.
Typical applications of containment include :
pollution which is generally found at a depth of more than 3 metres;
-
for shallower depths, containment is not recommended in the case of smaller pollution surfaces:
500 m 2 ...
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Vertical confinement
Deep horizontal confinement
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