ISCO-ISS Successfully Remediates Petroleum Hydrocarbon Contaminated Soils while Achieving Compressive Soil Strength Goals for Site Redevelopment

The selected remedy, soil mixing using in situ chemical oxidation (ISCO) combined with in situ solidification and stabilization (ISS) was used to destroy contaminants while stabilizing soils

Type of Site

Gas Station


Bolzano, Italy


BTEX, petroleum hydrocarbons

ISCO was successfully combined with ISS at this site achieving all of the remedial goals common for redevelopment sites. Benzene and TPH (Cto C12) were reduced to below the remedial goals. TPH (C13 to C40) were reduced and the residual contamination was then solidified into a matrix with a significantly lower permeability compared to the surrounding geology. Finally, the soils had targeted compressive strengths shortly after the application allowing for site activities during the application and rapid site redevelopment.