In Soil vapor extraction (SVE), a vacuum is applied to the soil to induce the controlled flow of air to remove volatile and some semivolatile organic contaminants from the soil. Bioventing is similar to SVE in that a vacuum is applied to induce air flow, but the goal of bioventing is to provide oxygen to support indigenous microbial degradation. Biosparging typically involves the injection of air, oxygen, ozone or methane to encourage increased biodegradation. Biosparging is frequently coupled with SVE in order to control volatilized contaminant vapors.