Former Aïre landfill: investigation and monitoring

The landfill was declared to be in need of remediation on the basis of previous preliminary studies relating to contaminated sites legislation. In order to assess the urgency of redevelopment, we carried out a detailed investigation as part of the planned expansion. As part of this investigation, we were able to prove that the pollutants from the old landfill (ammonium, benzene) had largely degraded, meaning that redevelopment was not necessary. The study also revealed that the groundwater and subsoil are significantly contaminated with PFAS (per- and polyfluoroalkylated substances). The investigation of the origin of PFAS at the site and their distribution using historical data, Water and soil analyses and digital 3D modeling of the subsurface provided the basis for determining measures to protect environmental assets in connection with the current plans for the expansion of the wastewater treatment plant.