A widespread plume of chlorinated solvents has been monitored for more than a decade underneath a metropolitan area in Italy. The chlorinated solvent concentrations are low (100 μg/l) but persistent, with no effective natural attenuation occurring. This plume had previously been considered as practically untreatable, due to the low concentration, location and size. However, the creation of our PlumeStop technology allows for the effective treatment of widespread, low concentration plumes using a combination of in situ adsorption and enhanced biological degradation. This provides a rapid and sustained treatment to very low concentration targets from a single, simple and safe injection into the subsurface.

The intention on this site is to treat all of the accessible ‘hotspots’ present within the plume, with the first area being used as a pilot test to confirm dose and distribution.


Regenesis installed 6 multi-level injection wells and applied specific doses of PlumeStop at the target depths. On-site works were completed in 3 weeks and have included the execution of a range of tests and trials in order to obtain useful information for a detailed full scale design and a confirmation of of treatment effectiveness.

What’s Special?

  • PlumeStop Liquid Activated Carbon is an in situ technology with unprecedented capabilities; able to rapidly remove contaminants from the groundwater and degrade them within a few months.
  • It had been considered impossible to treat this site due to the low starting concentration and remediation targets, how widespread the plume is and its location under a city centre. PlumeStop makes the treatment simple and cost-effective.
  • Thanks to the self-regenerating process of the matrix provided by the enhanced biodegradation, there is no need for re-application, even when contamination continues to enter the treatment zone from upgradient areas.