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Printing Facility, Karst Terrain, Eastern Tennessee After discovery of contaminated soil under a former drum storage area, ground water was found to be contaminated by PCE up to 11.6 mg/l. Contaminated soil was removed from the source area. Subsequently, three years of ground water monitoring showed the ground water concentrations had not attenuated. Cl-out aerobic bioremediation was implemented in the ground water under the source area. After three years of Cl-out aerobic bioremediation, the contaminant concentrations throughout the two-acre plume were reduced nearly to drinking water standards. 
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