Vapor extraction is a highly effective method for treating volatile and semi-volatile organic compounds in soil. The vapor extraction treatment process can be accomplished in-situ depending on contaminant distribution and geological characteristics. The treatment process involves the installation of extraction wells, and in some cases injection wells, and applying a vacuum to the soils in the contaminated region. Light petroleum hydrocarbons and VOCs are transferred to the vapor phase by induction of a negative pressure air stream.

The air is extracted by a vacuum blower or a vacuum pump. By creating negative pressure gradients in a series of zones within the soil, an airflow is induced which causes volatilization of the volatile hydrocarbons. The VOC laden air stream, together with the entrained moisture and dust, is extracted from the impacted soil to a vapor extraction system (VES). VOCs in the vapor stream are treated using granulated activated carbon, catalytic/thermal oxidation, or internal combustion engines.

Sumas also conducts in-situ remediation through dual phase vapor-liquid extraction process also referred to as Bioslurping. Bioslurping is an innovative in-situ remediation technology that utilizes an applied vacuum to recover Light Non-aqueous Phase Liquids (LNAPL) through small diameter recovery piping (Slurp-tube) while simultaneously biodegrading adsorbed phase hydrocarbons in the vadose zone due to the inherent replenishment of oxygen that occurs. Aerobic conditions created by the addition of atmospheric oxygen creates a "bioreactor" degrading the smear zone contaminants in-situ.

Bioslurping and bioventing are proven in-situ remediation technology that have been successfully applied in many site remediation projects involving petroleum hydrocarbons. Sumas has mobile, skid-mounted units for rapid deployment, and the design/construct capabilities to accommodate a variety of project requirements.