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Brickhouse has conducted several studies to evaluate potential sources of PFAS impacts in multi-layered coastal plain aquifer systems as well as fractured rock systems. Potential source areas were identified using multiple lines of evidence, including: review of historic resources, assembly of AFFF usage timelines, forensic chemical composition and ratio evaluations, and assessment of groundwater flow models. We have also worked with labs that use branched isomer separation methods to help identify and differentiate between different PFAS sources.