Air sparging is sometimes referred to as in situ air stripping. When used in combination with soil vapor extraction (SVE), air bubbles carry vapor phase contaminants to a SVE system which removes them. The SVE system controls vapor plume migration by creating a negative pressure in the unsaturated zone through a series of extraction wells. Using air sparging as an SVE enhancement technology increases contaminant movement and enhances oxygenation in the subsurface which increases the rate of contaminant extraction.