Chlorinated solvent pollutions are characterized by a relatively small core zone (the ‘source’) with a plume whose extent depends on groundwater flow and conditions for biological degradation. A cost-effective remediation of this dual situation differentiates between the core zone and the plume. Remediation usually consists of an active treatment of the core zones combined with a management of the risks of the plume by an active containment or mere control.

Several techniques are being used like pump and treat and new ones like injection of iron particles in the groundwater will be tested in pilot sites. In a remediation project authorities will ask for the 'Best Available Technology Not entailing Excessive Economical Costs '– the BATNEEC principle.