Abstract
This paper evaluated the effects of the pump-and-treat technique and natural attenuation of trichloroethylene (TCE) at a contaminated site. At this site, the pump-and-treat technique for 14 years succeeded in the decontamination of shallow groundwater. During this time, the restoration rate, which was the rate of the decrease in TCE concentration, was observed to increase with the amount of groundwater extracted while the concentration exceeded the environmental standard, but this relationship ceased when the concentration came within the standard. In the meanwhile, dichloroethylene concentrations were about 64% of the TCE concentrations and natural attenuation shortened the restoration period by 2 years.
