This confidential engagement involved the remediation of an industrial site contaminated with a substantial LNAPL plume, chlorinated solvents, PFAS and asbestos. Innovative investigation techniques were adopted to produce a 3D model of the contaminant plume.

AECOM produced a remedial options assessment which included PFAS management and in-situ solidification. Future remedial works will be required following once industrial operations on the site have ceased.

Our approach was to first gain an understanding of the site history and site industrial processes, which allowed us to target our investigation and promote an efficient initial scope of investigation. From this we were able to develop a comprehensive investigation program involving extensive soil and groundwater sampling and delineation of a co-mingled LNAPL, chlorinated solvent and PFAS plume.

An additional detailed investigation of PFAS impacts was undertaken in 2016 in response to several Environmental Protection Agency requests for information regarding historical PFAS use at the site. We developed a detailed investigation to determine the nature and extent of PFAS impacts in a complex hydrogeological setting. The investigation involved the installation of a number of nested groundwater wells to understand PFAS stratification in the aquifer, groundwater level data logging and assessment of geochemical conditions and PFAS fate and transport modelling. AECOM also developed a comprehensive human health and ecological risk assessment.