One of the easiest ways to remove a large mass of residual PCE from ground water is to treat the ground water following source soil excavation. Because CL-Out microbes cometabolize PCE under aerobic conditions, the microbes can be applied to the ground water in the base of the excavation to treat residual contamination in the soil and ground water. The excavation can serve as an easy access route into a large area of ground water in lieu of multiple injection points.
This method has been used at many dry cleaner locations with a variety of soil types and geologic settings. Recently this method has been used at a former dry cleaners near Dayton, Ohio. At this site the PCE concentrations were reduced from 570 ug/L to 43 ug/L with one application into the source soil excavation cavity.