methods and apparatuses for removing contaminants . at least one injection well is drilled through the vadose zone to a depth below the water table defining the upper boundary of the aquifer . a plurality of venting wells or venting laterals are established to a depth above the water table sufficient to discourage fouling by contaminated water or condensate , and oxygenated substances are injected under pressure through the injection wells . additional biochemical cleansing may occur at ground level prior to venting of contaminated air . microbes natural to the contaminated site may be extracted , analyzed , fermented , and reintroduced to enhance biodegradation , and nutrients , food , or both , may be supplied to the microbial population to sustain high levels of degradation activity . relatively pure liquid contaminant may be separated from other fluids , such as water . modes of enhancing the lateral dispersion of injected substances are disclosed , for example , hingedly connected radially extendible injection tubes which expand the radius of injection .