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Definition: air sparging

Air sparging is an in situ remedial technology
that reduces concentrations of volatile
constituents in petroleum products that are
adsorbed to soils and dissolved in groundwater. It
involves the injection of contaminant-free air
into the subsurface saturated zone, enabling a
phase transfer of hydrocarbons from a dissolved
state to a vapor phase. The air is then vented
through the unsaturated zone.

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