BioRemedial Technologies, Inc., has implemented a ground-water treatment system utilizing a non-toxic cometabolite, Compound C, for the aerobic removal of trichloroethylene in ground water. Phase II and Phase III studies on ground water and soil located underneath a RCRA 90-day drum storage pad at a welding consumables plant in Ashtabula, Ohio, indicated the presence of various chlorinated organics. The site was found to contain high levels of trichloroethylene (27 ppm in ground water and up to 600 mg/kg in soil) and lesser concentrations of tetrachloroethylene, cis-1,2-dichloroethylene, and vinyl chloride. The approximate area of affected soil and ground water is 50,000 square feet and includes an extension of the contaminated plume downgradient from the source area. The soils possess an average horizontal ground-water flow velocity of less than one foot per year. Site treatment began in October 1999. Trichloroethylene concentrations in three of the four monitoring wells have been reduced by greater than 90% during the first two quarters of system operation. An overall cost savings in excess of $1,000,000 is estimated by the client when comparing the biological treatment system to other remediation disposal technologies.