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What does it mean? soil vapor extraction

Soil vapor extraction is an in situ remedial
technology that reduces concentrations of volatile
constituents in petroleum products adsorbed to
soils in the unsaturated (vadose) zone. A vacuum
is applied through wells near the source of
contamination in the soil. Volatile constituents
of the contaminant mass 'evaporate' and the vapors
are drawn toward extraction wells. Extracted vapor
is then treated (commonly with carbon adsorption)
before being released to the atmosphere.

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