Abstract: A pressure extraction process for removal of underground contaminants from subsurface soil and groundwater comprises establishing a well through the unsaturated soil into the underlying groundwater unit, with the well including an exterior pipe having fluid permeable openings therein at a lower portion that extends above and below the groundwater surface. An interior pipe is provided inside the exterior pipe and has an inlet opening below the groundwater surface. Oxygen-containing gas is injected into the exterior pipe at a non-vacuum pressure. Preferably the pressure is sufficient to cause some of the gas to flow outwardly into the soil through the pipe openings. A gas pressure flow is established downwardly in the exterior pipe to the inlet of the interior pipe and then upwardly through the interior pipe and out of the well.