Passive and hydraulicContainment
Passive containment includes barriers and hydraulic containment 
(i.e. pump and treat).
Containment describes a range of approaches which are used 
to prevent the migration of contamination. As such all containment
approaches are examples of pathway management. Passive
containment is achieved by introducing impermeable barriers
that prevent the flow of water (and/or gases). Hydraulic
containment (pump and treat) relies on pumping the contaminated
groundwater to the surface using a series of extraction
wells, treating it at the surface to remove the contaminants,
and then either reinjecting the water underground or disposing
of it off site.
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