and v 6 are then opened to directly deliver bioslurry from tanks lt 1 and lt 2 into the subsurface all valves are closed when the desired amount of bioslurry has been injected finally in order to cleanse the injection line of the viscous polylactate ester or other organic hydrogen donors more reducing agent slurry is once again injected from tank t 2 having been transferred there from tanks lt 1 and lt 2 as previously described with the injections complete a post injection line purge is performed by opening valves v 9 and v 1 and injecting gas to clear the lines of any remaining reducing agents with the lines cleaned the process is complete and the next injection location is prepared in accordance with the invention a test was carried out and the following results observed a site known to be contained with chlorinated solvents was geologically mapped after determination of the subsurface contaminate concentrations characteristics and the direction of flow of groundwater a series of injection points were drilled contaminate concentrations of cis 1 2 dce prior to the biodegradation process ranged from 6 6 ppb to 69 ppb the initial concentration of vc ranged from 0 97 to.