ABSTRACT
The removal system construction began with installation of a 5-inch borehole, at the location where sludge had been applied to the soil surface. In-situ removal of soil contaminants through air purging has been established as a potential remedial action tool, but each site must be evaluated individually for feasibility and design. The system was developed as a prototype for enhancement of volatilization of purgeable organics in vadose zone soils. The system forced clean air into the vadose zone at a radius outside the contaminated region and pulled the clean air toward the center of the contaminated area where it was withdrawn under reduced pressure. More accurate determination of the contaminated volume required additional borings both inside and outside the building. Vacuum development in the vadose zone was monitored at 5, 10, and 20 feet from the central withdrawal well. These points were set at 15 feet below grade and were linked to water manometers inside the building.
