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unsaturated zone |
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The two most common classes are a) NAPLs composed of fuel hydrocarbons that are lighter (LNAPLs) than water and, thus, more easily detected, because they tend to remain within the unsaturated zone or capillary fringe areas of an aquifer; and b) organic solvent or dense NAPLs (DNAPLs) that tend to migrate deep into formations, becoming entrapped in irregular finger-like structures or pooled on low permeability strata. Aerobic biofilters (using the clean soil of a nearby unsaturated zone as a filter when vapor is drawn through first the contaminated and then the clean soil to allow microorganisms to biologically degrade hydrocarbons); Researchers installed pressure/vacuum lysimeters in the unsaturated zone of six landfills. |
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