A site investigation at a brownfield redevelopment site in Barcelona revealed the presence of chlorinated solvent contamination in the groundwater. TCE was present as the parent compound, as well as elevated concentrations of daughter products DCE and VC. Due to the target area extending under the footprint of the proposed building and the short build programme, a grid of horizontal injection pipes was installed in the subsurface prior to construction commencing. The grid was then linked to a remote injection location, so that when the new building was constructed, injection was simultaneously completed underneath it.

The intention of the remediation was to achieve a rapid and significant reduction of the contaminant concentrations in the groundwater. PersulfOx was selected as the preferred ISCO agent due to its efficiency and capability of moving through the vadose zone into the groundwater, guaranteeing a good distribution.