The contamination was due to the discharge of chlorinated solvents (DCE, TCE, PCE) related to the former dry-cleaning activities in the building. The site was composed of two zones, located in the patio outside the building (25 m²) and located in the basement (17 m²) respectively.

The purpose of the treatment was to make a soil and water table treatment with two distinct technologies. The first step was to heat the soil down to the limit of the unsaturated zone to extract the contaminants present in the solid matrix. The second and last step was to inject high oxidative compounds in the saturated zone as a finishing remediation intervention. This last part was executed by an expert in the field, Injectis S.A. These operations were executed between February 2021 and May 2021.

• 22 Natural Gas Smart Burners – Vapor Treatment with granulated activated carbon (HT)
• Sodium Permanganate Solutions for injections in the saturated zone (Injectis S.A)

• 95°C at the cold points
• 1 mg/kg of PCE (Perchloroethylene), TCE (Trichloethylene) and DCE (1,2-Dichloroethane) in soil
• 1000µg/L in water table

• 3 temperature probe wells in the basement (at depths 1m and 3.5m below ground level)
• 3 temperature probe wells in the patio (at depths 1m, 3.5m and 6.5m below ground level)
• 2 pressure wells
• VOC reading at the vent and in the ambient environment of the treatment area

February 2021 to May 2021

The thermal treatment of the unsaturated area has proven so far to have remediated more than 98% of the contamination.
Water table monitoring for the relevant contaminants is still ongoing until at least 2022.