In-Situ Remediation Systems for Soil and Groundwater Treatment
EMS has extensive experience with the construction and installation of in-situ remediation systems, including soil vapor extraction (SVE), air sparge and pump & treat systems. EMS will procure the system components, construct the system and install associated trenches, piping and/or wells per the specifications.
Soil vapor extraction (SVE)
Soil vapor extraction (SVE) is an in-situ remediation technology that involves the installation of a series of "wells" in the contaminated soil above the water table and placing a negative pressure on wells in the vadose zone to pull contaminated soil vapors from the subsurface soils.
Air sparging is an in-situ remediation technology in which air is injected through a contaminated aquifer over the period of a few months to a few years. The injected air moves in all directions away from the injection point through the groundwater and soil matrix creating an underground, in-situ "air stripper" that removes contaminants by volatilization. The injection of air helps to flush the contaminants upward into the unsaturated zone where a vapor extraction system is typically implemented to remove the volatilized contaminants. Air sparge technology is designed to operate at high flow rates to maintain increased contact between ground water and soil and strip more ground water by sparging. The technology also has other beneficial affects like adding dissolved oxygen to the contaminated ground water and un-saturated zone soils, which can enhance biodegradation of contaminants below and above the water table.
Pump & treat
The pump and treat method of in-situ remediation involves a series of ground water extraction wells (or an infiltration gallery) installed near the source area and/or along the facility property boundary. Contaminated ground water is pumped to the surface for treatment in an air stripper and/or granular activated carbon vessel prior to discharge to the public sewer or surface water (via a discharge permit).