Due to an industrial spill, high concentrations of chlorinated solvents were measured in a sandstone bedrock in southwest Germany. The plume was found to extend beneath a primary school and remediation was required in order to reduce the risk posed to human health.
Four rows of application wells were drilled into the bedrock across the site, perpendicular to the groundwater flow. Reagents HRC® and HRC X® were gravity-fed into the wells in order to disperse and diffuse into the surrounding bedrock. This created and maintained four optimum zones of enhanced reductive dechlorination, through which groundwater would pass, but the chlorinated solvent contamination would be degraded.
Total CHC, before treatment
Total CHC after treatment, three and a half years later
After 5 years of remediation, of the 6 validation wells used for compliance: