Information from two 1990 EPA documents: Assessing UST corrective action technologies: site assessment and selection of unsaturated zone treatment technologies and ...early screening of clean up technologies for the saturated zone. Describes soil venting, biorestoration, soil flushing, hydraulic barriers, and excavation for unsaturated zones. Covers groundwater extraction methods, vacuum extraction of non-aqueous phase liquids, and biorestoration for saturated zones. Annotation copyrighted by Book News, Inc., Portland, OR