Environmental Forensic Investigation of PFAS Manufacturing Releases, Drinking Water Contamination, Groundwater Migration, Air Emissions, and Exposure Assessment
Project Overview
Per- and polyfluoroalkyl substances (PFAS) comprise a large class of synthetic fluorinated compounds that have been manufactured and used for decades because of their exceptional chemical stability, resistance to heat, and unique surfactant properties. These characteristics have made PFAS valuable in the production of fluoropolymers, fluoroelastomers, specialty coatings, firefighting foams, electronics, textiles, and numerous industrial applications. The same chemical stability that makes PFAS commercially useful, however, also contributes to their environmental persistence, long-range transport, resistance to degradation, and widespread occurrence in environmental media. Consequently, environmental forensic investigations involving historical PFAS manufacturing facilities require comprehensive evaluation of historical industrial operations, manufacturing processes, waste management practices, environmental releases, contaminant migration pathways, groundwater flow, surface water transport, atmospheric emissions, and potential human exposure.
This investigation involved a comprehensive environmental forensic evaluation of historical and current PFAS manufacturing operations at a major fluorochemical production facility. The technical review integrated historical manufacturing records, engineering documentation, conceptual site models, environmental monitoring data, groundwater investigations, wastewater treatment evaluations, air emissions information, toxicological literature, regulatory documentation, corporate records, and multiple expert analyses to reconstruct the environmental history of PFAS production and evaluate the movement of PFAS through multiple environmental pathways. Rather than relying upon a single category of evidence, the investigation incorporated numerous independent technical sources to evaluate contaminant sources, environmental fate and transport, exposure pathways, and the scientific information available regarding historical and ongoing PFAS releases. The reviewed materials included conceptual site models prepared for regulatory agencies, engineering evaluations of manufacturing operations, historical corporate documentation, toxicological analyses, groundwater investigations, and regulatory filings describing historical site operations and contaminant migration.
The investigation was conducted using accepted principles of environmental forensics, environmental chemistry, hydrogeology, environmental engineering, contaminant fate and transport, historical site reconstruction, exposure assessment, and human health risk evaluation. Particular emphasis was placed on identifying historical sources of PFAS, evaluating how manufacturing operations contributed to releases into environmental media, characterizing contaminant migration through groundwater, surface water, wastewater systems, and atmospheric pathways, and integrating multiple independent datasets to develop a scientifically supported understanding of environmental conditions. The investigation also evaluated how manufacturing practices, waste management systems, engineering controls, and environmental monitoring evolved over time as scientific understanding of PFAS expanded and regulatory requirements became increasingly comprehensive.
Unlike investigations involving a single contaminant release, PFAS manufacturing facilities frequently involve multiple decades of production, numerous individual PFAS compounds, changing manufacturing technologies, evolving waste management practices, and numerous potential environmental release mechanisms operating simultaneously. As a result, environmental forensic investigations require reconstruction of historical manufacturing operations alongside evaluation of multiple environmental media, including soil, groundwater, surface water, sediment, wastewater, air emissions, and drinking water supplies. The reviewed documentation demonstrated that comprehensive conceptual site models provide an important framework for organizing these complex environmental relationships by identifying contaminant sources, migration pathways, receptors, and exposure mechanisms into an integrated environmental system.
Another important objective of the investigation involved evaluating how PFAS moved beyond facility boundaries through interconnected environmental pathways. Historical manufacturing activities can result in contaminant releases through process wastewater, permitted discharges, stormwater runoff, groundwater migration, atmospheric emissions, disposal of manufacturing residuals, and other historical waste management practices. Once released, PFAS may migrate through groundwater aquifers, discharge into adjacent rivers and streams, accumulate within sediments, deposit onto surrounding soils through atmospheric transport, or enter public and private drinking water supplies. Consequently, the investigation integrated hydrogeologic information, engineering evaluations, groundwater monitoring, surface water investigations, conceptual site models, and toxicological literature to evaluate the environmental behavior of PFAS across multiple environmental compartments rather than considering each medium independently.
The investigation further recognized that understanding historical industrial operations is fundamental to modern environmental forensic science. Historical production methods, changes in manufacturing chemistry, evolution of waste treatment technologies, modifications to wastewater systems, implementation of emission controls, and historical corporate practices all influence present-day environmental conditions. Accordingly, historical manufacturing records, engineering documentation, toxicological evaluations, and corporate records were reviewed to reconstruct operational practices associated with PFAS production over several decades. This historical reconstruction provides critical context for interpreting contemporary environmental monitoring data, evaluating contaminant distributions, and identifying the most probable pathways through which PFAS entered surrounding environmental media.
Chemicals of Concern
The principal contaminants evaluated during this investigation were per- and polyfluoroalkyl substances (PFAS), a diverse family of fluorinated organic compounds characterized by carbon-fluorine bonds that are among the strongest chemical bonds found in organic chemistry. This exceptional chemical stability contributes to the persistence of PFAS in environmental media and has resulted in their widespread detection in groundwater, surface water, soils, sediments, wildlife, and human blood throughout the world. Because many PFAS resist natural degradation processes, environmental releases occurring decades ago may continue to influence environmental conditions today through long-term migration and redistribution among environmental media.
The investigation evaluated numerous individual PFAS compounds associated with historical fluorochemical manufacturing, including perfluorooctanoic acid (PFOA), perfluorooctane sulfonate (PFOS), perfluorononanoic acid (PFNA), hexafluoropropylene oxide dimer acid (HFPO-DA or GenX), perfluorohexanoic acid (PFHxA), perfluorobutanoic acid (PFBA), perfluoroheptanoic acid (PFHpA), perfluorodecanoic acid (PFDA), perfluoroundecanoic acid (PFUnA), and numerous precursor compounds used during fluoropolymer and fluorotelomer manufacturing. The reviewed engineering documentation demonstrated that multiple PFAS compounds were associated with different manufacturing processes and that their environmental behavior depended upon differences in chemical structure, molecular weight, water solubility, and production history.
Particular attention was devoted to PFOA because of its historical use as a polymerization aid during fluoropolymer manufacturing and its recognized environmental persistence. Historical manufacturing records and engineering evaluations documented the extensive use of PFOA within fluoroelastomer production processes together with pathways through which PFOA entered wastewater treatment systems, atmospheric emissions, manufacturing residuals, and finished products. Because PFOA exhibits substantial environmental mobility while remaining resistant to degradation, releases associated with historical manufacturing activities can migrate considerable distances through groundwater and surface water over extended periods. The reviewed engineering evaluations also documented estimates of historical PFOA utilization, discharge pathways, wastewater treatment performance, and environmental releases over multiple decades of manufacturing operations.
The investigation further considered the environmental significance of PFAS precursor compounds generated during fluorotelomer manufacturing. Unlike terminal perfluoroalkyl acids such as PFOA and PFOS, precursor compounds may transform over time through biological or environmental processes into more persistent terminal PFAS. Consequently, environmental forensic investigations must evaluate both direct releases of terminal PFAS and indirect formation resulting from degradation of precursor compounds after environmental release. This distinction is particularly important because environmental monitoring conducted years after historical releases may detect degradation products that differ substantially from the compounds originally manufactured or discharged.
From an environmental fate and transport perspective, PFAS exhibit several characteristics that distinguish them from many conventional organic contaminants. Many PFAS are highly soluble in water, exhibit relatively low volatility, resist hydrolysis, photolysis, and biodegradation, and migrate readily within groundwater aquifers. At the same time, certain PFAS exhibit strong affinity for proteins, sediments, soils, and organic matter depending upon molecular structure and chain length. These properties allow PFAS to move through interconnected environmental pathways involving groundwater, surface water, wastewater systems, stormwater runoff, and sediments while simultaneously exhibiting long environmental residence times. Consequently, comprehensive conceptual site models are frequently required to describe the multiple environmental pathways through which PFAS migrate following release from manufacturing facilities.
The toxicological significance of PFAS has expanded considerably as scientific understanding has evolved over recent decades. Numerous epidemiological studies, toxicological investigations, biomonitoring programs, and regulatory evaluations have examined associations between PFAS exposure and developmental effects, liver toxicity, immune system impacts, endocrine disruption, altered lipid metabolism, reproductive outcomes, and certain cancers. Because individual PFAS compounds differ in toxicological potency, environmental persistence, and biological half-life, the investigation considered toxicological information relevant to both individual compounds and cumulative PFAS exposure. The reviewed toxicological analyses also addressed historical standards of care regarding toxicity testing, scientific knowledge available during different manufacturing periods, and the evolution of regulatory and industry understanding concerning PFAS health effects.
Finally, the investigation recognized that PFAS exposure may occur through multiple environmental pathways operating simultaneously. Drinking water contaminated by groundwater migration frequently represents one of the most significant exposure pathways for nearby communities. However, PFAS may also reach human receptors through ingestion of contaminated surface water, consumption of contaminated fish, incidental soil ingestion, occupational exposure, atmospheric deposition, and other environmental transport mechanisms. Evaluation of these interconnected pathways required integration of hydrogeology, environmental chemistry, engineering analysis, toxicology, environmental monitoring, and conceptual site modeling into a comprehensive environmental forensic assessment capable of characterizing both historical contaminant releases and ongoing environmental migration.
Methods
The investigation was conducted using accepted principles of environmental forensics, environmental engineering, hydrogeology, environmental chemistry, contaminant fate and transport, exposure assessment, and historical site reconstruction. Because PFAS manufacturing facilities often operate for multiple decades and involve numerous manufacturing processes, waste streams, and environmental release mechanisms, the evaluation required integration of engineering documentation, historical manufacturing records, conceptual site models, environmental monitoring data, groundwater investigations, regulatory filings, toxicological literature, and expert analyses into a comprehensive technical framework. Rather than relying upon any single category of information, the investigation synthesized multiple independent sources of evidence to reconstruct historical environmental conditions and evaluate the migration of PFAS through interconnected environmental media. This multidisciplinary approach reflects accepted environmental consulting practice for evaluating complex industrial contamination involving persistent environmental contaminants.
A primary component of the investigation involved historical site reconstruction. Historical manufacturing records, engineering documents, corporate reports, process descriptions, historical production information, and technical memoranda were reviewed to identify when various PFAS manufacturing processes began, how manufacturing operations evolved over time, and which chemicals were associated with individual production lines. Evaluation of historical operations included fluoroelastomer manufacturing, fluorotelomer production, polymerization processes, wastewater handling systems, chemical recycling operations, waste management practices, and process modifications implemented throughout the facility’s operating history. Reconstructing these historical operations provided an essential foundation for understanding how historical releases contributed to present-day environmental conditions and allowed environmental observations to be interpreted within the context of changing industrial practices.
The investigation also relied extensively on conceptual site modeling (CSM), an accepted environmental engineering methodology used to organize complex contaminant investigations. The conceptual site model integrated contaminant source areas, environmental release mechanisms, migration pathways, exposure routes, environmental receptors, hydrogeologic conditions, and environmental monitoring results into a unified technical framework. Rather than evaluating groundwater, surface water, air emissions, wastewater, soils, and sediments independently, the conceptual site model examined the interactions among these environmental systems to better characterize contaminant transport throughout the facility and surrounding environment. The reviewed CSM identified multiple potential PFAS source areas, described historical manufacturing locations, evaluated environmental migration pathways, and characterized both on-site and off-site environmental receptors.
Hydrogeologic evaluation represented another major component of the investigation. Groundwater monitoring data, groundwater flow interpretations, aquifer information, monitoring well networks, and conceptual hydrogeologic cross-sections were reviewed to evaluate subsurface migration of PFAS following historical releases. Particular attention was devoted to groundwater movement beneath the manufacturing facility and the potential migration of dissolved PFAS toward adjacent properties, surface water bodies, and drinking water supplies. Evaluation of groundwater transport included consideration of hydraulic gradients, aquifer characteristics, groundwater discharge, groundwater interception systems, and interactions between groundwater and nearby surface water features. Hydrogeologic reconstruction is particularly important for PFAS investigations because many PFAS compounds exhibit relatively high mobility in groundwater while remaining resistant to natural degradation, allowing contamination to persist and migrate over considerable distances.
The investigation further evaluated surface water transport and wastewater management systems associated with historical manufacturing operations. Engineering reports described wastewater treatment processes, process water recycling, permitted discharges, stormwater management systems, interceptor wells, and wastewater treatment plant operations. Historical discharge information was reviewed to evaluate the movement of PFAS through wastewater treatment systems and eventual discharge to receiving surface waters. Because conventional wastewater treatment technologies were not originally designed to remove PFAS efficiently, evaluation of treatment system performance represented an important aspect of understanding historical contaminant releases. Engineering analyses also examined the transport of PFAS through treatment facilities, discharge outfalls, and receiving water bodies over multiple decades of facility operation.
Atmospheric release pathways were also evaluated as part of the environmental forensic investigation. Historical engineering documentation, process descriptions, stack testing information, emissions summaries, and manufacturing records were reviewed to evaluate airborne PFAS releases associated with manufacturing operations. Although groundwater and wastewater pathways represented significant components of the investigation, conceptual site modeling also identified air emissions as an important mechanism through which PFAS could be transported beyond facility boundaries. Evaluation of atmospheric releases considered manufacturing operations, process equipment, emission control technologies, and the potential contribution of airborne releases to off-site environmental deposition. Consideration of atmospheric transport alongside groundwater and wastewater pathways reflects the interconnected nature of PFAS environmental migration and provides a more complete understanding of contaminant fate and transport.
The investigation incorporated extensive review of environmental chemistry and PFAS fate and transport. Individual PFAS compounds exhibit differing physical and chemical properties that influence their mobility, persistence, sorption behavior, bioaccumulation potential, and environmental distribution. The technical evaluation therefore considered how molecular structure, carbon-chain length, functional group chemistry, and precursor transformation influence environmental behavior following release. Particular emphasis was placed on distinguishing between direct releases of terminal PFAS compounds and the environmental transformation of precursor compounds into persistent degradation products. Understanding these chemical processes is essential because PFAS detected during present-day environmental monitoring may differ from the compounds originally manufactured or discharged decades earlier.
Exposure assessment constituted another major element of the investigation. Potential human exposure pathways were evaluated by integrating groundwater investigations, residential drinking water information, surface water monitoring, environmental chemistry, conceptual site modeling, and toxicological literature. Rather than assuming a single exposure pathway, the investigation recognized that PFAS may reach human populations through contaminated drinking water, groundwater migration, surface water, fish consumption, atmospheric deposition, occupational exposure, and incidental soil ingestion. Evaluation of these multiple exposure mechanisms provides a more comprehensive understanding of potential environmental impacts than focusing exclusively on any individual pathway.
The technical evaluation also incorporated historical toxicology and regulatory review. Scientific literature, historical industry documents, corporate records, toxicological evaluations, and regulatory guidance were reviewed to understand the evolution of scientific knowledge regarding PFAS toxicity, environmental persistence, bioaccumulation, and human health effects. The investigation considered historical standards of care regarding chemical testing, the timing of toxicological research, changing regulatory expectations, and the progression of scientific understanding concerning PFAS over multiple decades. This historical perspective is particularly important in environmental forensic investigations because environmental conditions often reflect manufacturing decisions and scientific knowledge that evolved over extended periods rather than isolated events.
Finally, the investigation employed a weight-of-evidence methodology that integrated engineering analyses, historical manufacturing information, conceptual site modeling, groundwater investigations, environmental chemistry, environmental monitoring, toxicological literature, hydrogeologic interpretation, and regulatory documentation into a unified environmental forensic assessment. Each category of information contributed unique technical insight regarding contaminant sources, migration pathways, environmental behavior, and potential exposure. By evaluating these independent datasets collectively rather than in isolation, the investigation reduced uncertainty associated with any single source of information and developed a scientifically supported reconstruction of historical PFAS releases and their long-term environmental consequences. This multidisciplinary methodology represents current best practice within environmental consulting, environmental litigation support, expert witness investigations, and environmental forensic science for evaluating complex PFAS contamination involving multiple decades of industrial operations and multiple environmental media.
Results
Review of the available technical documentation demonstrated that historical PFAS manufacturing facilities can be evaluated using a scientifically rigorous combination of environmental engineering, hydrogeology, environmental chemistry, toxicology, conceptual site modeling, historical records reconstruction, and contaminant fate and transport analysis. Although the reviewed materials encompassed numerous decades of manufacturing operations and multiple PFAS compounds, the investigation consistently demonstrated that integrating independent technical datasets provides a substantially more complete understanding of environmental contamination than reliance upon any single environmental medium or regulatory record. Collectively, the reviewed engineering reports, conceptual site models, historical manufacturing records, toxicological evaluations, groundwater investigations, environmental monitoring data, and regulatory documentation provided a comprehensive scientific foundation for reconstructing historical PFAS releases and evaluating their movement through interconnected environmental systems.
One of the principal findings of the investigation was the identification of multiple historical PFAS source areas associated with fluorochemical manufacturing operations. Rather than originating from a single release mechanism, the reviewed documentation described numerous manufacturing processes involving fluoropolymers, fluoroelastomers, fluorotelomers, process wastewater, recycling operations, waste management systems, and production support activities that contributed to the overall environmental history of the facility. Historical engineering documentation demonstrated that PFAS entered environmental systems through a combination of manufacturing operations, wastewater treatment processes, air emissions, stormwater systems, groundwater migration, disposal practices, and historical waste handling activities. This finding illustrates the importance of evaluating industrial facilities as integrated operational systems rather than focusing exclusively on individual release events.
The investigation further demonstrated the value of conceptual site modeling in understanding complex environmental contamination. The reviewed conceptual site model identified multiple contaminant source areas together with corresponding migration pathways involving groundwater, surface water, wastewater, atmospheric transport, soils, sediments, and drinking water. Rather than treating these pathways independently, the conceptual site model illustrated how contaminants migrated among environmental media over time and identified the physical mechanisms responsible for off-site transport. Evaluation of these interconnected pathways strengthened the environmental forensic investigation by providing a scientifically supported framework through which historical environmental monitoring data, engineering analyses, and hydrogeologic information could be interpreted collectively.
Groundwater investigations represented another significant finding of the technical evaluation. Hydrogeologic analyses, groundwater monitoring, and environmental investigations documented the migration of dissolved PFAS through subsurface aquifers beyond historical manufacturing areas. The reviewed documentation demonstrated that groundwater transport constituted one of the principal mechanisms by which historical releases reached off-site receptors and residential drinking water supplies. Engineering evaluations further described groundwater interception systems, monitoring networks, hydraulic conditions, and remedial measures implemented to evaluate and address groundwater contamination. These findings emphasize the importance of hydrogeologic characterization within PFAS investigations because groundwater frequently serves as the dominant long-term transport mechanism for many perfluoroalkyl substances.
The investigation also documented the importance of wastewater treatment systems in understanding historical PFAS releases. Engineering evaluations described how manufacturing wastewater, process residuals, interceptor well flows, landfill leachate, and other PFAS-containing waste streams entered wastewater treatment operations before discharge to receiving waters. The reviewed technical analyses concluded that conventional wastewater treatment processes historically removed PFAS incompletely, allowing measurable quantities of multiple PFAS compounds to be discharged through permitted outfalls over extended periods of facility operation. Engineering estimates developed within the reviewed reports quantified historical PFAS utilization, wastewater loading, and long-term discharge patterns, providing an important scientific basis for understanding contaminant transport into adjacent surface water systems.
Evaluation of environmental chemistry further demonstrated that PFAS behavior differs substantially from many traditional industrial contaminants. The reviewed technical documentation consistently recognized that many PFAS compounds exhibit exceptional persistence, high mobility within groundwater, resistance to biological degradation, and long environmental residence times. In addition, precursor compounds associated with historical manufacturing may transform into more persistent terminal PFAS following environmental release, resulting in contaminant distributions that evolve over many years after the original manufacturing activities occurred. These chemical characteristics explain why present-day environmental monitoring often reflects both historical manufacturing operations and long-term environmental transformation processes. Consideration of these chemical processes therefore represents an essential component of scientifically rigorous PFAS investigations.
The reviewed toxicological literature and expert evaluations also demonstrated that scientific understanding of PFAS has evolved substantially over time. Historical corporate records, toxicological evaluations, and scientific literature documented changing knowledge regarding PFAS persistence, bioaccumulation, toxicity, and potential human health effects. The investigation considered how industry practices, toxicological testing, scientific understanding, and regulatory expectations changed over several decades as additional information became available concerning the environmental behavior and biological significance of PFAS. This historical perspective is particularly important within environmental forensic investigations because historical manufacturing decisions frequently preceded the current scientific understanding of PFAS environmental persistence and exposure pathways.
Finally, the investigation demonstrated that modern environmental forensic evaluations benefit substantially from integrating engineering analyses, hydrogeologic investigations, conceptual site modeling, toxicological evidence, environmental monitoring, historical manufacturing information, and contaminant fate and transport into a unified technical framework. No individual environmental medium independently described the complete environmental history of the facility. However, when groundwater investigations, wastewater evaluations, air emissions analyses, environmental chemistry, historical documentation, and conceptual site models were considered collectively, they provided a comprehensive scientific basis for evaluating historical PFAS releases, long-term contaminant migration, and potential human exposure using accepted principles of environmental engineering and environmental forensic science.
Conclusions
The available technical documentation provides a comprehensive scientific foundation for evaluating historical PFAS manufacturing operations using accepted principles of environmental forensics, environmental engineering, hydrogeology, contaminant fate and transport, environmental chemistry, exposure assessment, and historical site reconstruction. Although PFAS investigations frequently involve multiple decades of industrial operations, numerous individual compounds, and several interconnected environmental pathways, integration of multiple independent technical datasets allows contaminant releases and migration pathways to be reconstructed using scientifically accepted methodologies.
The investigation demonstrated that historical manufacturing records, conceptual site models, groundwater investigations, wastewater treatment evaluations, air emissions analyses, environmental monitoring, toxicological literature, and regulatory documentation each contribute unique information regarding PFAS sources, environmental transport, and potential human exposure. When evaluated collectively through a weight-of-evidence framework, these independent technical datasets provide a more complete and scientifically defensible understanding of environmental conditions than reliance upon any individual category of evidence.
Review of the available documentation also illustrates the importance of evaluating PFAS contamination as a dynamic environmental system involving interconnected groundwater, surface water, wastewater, atmospheric, and drinking water pathways. Historical manufacturing practices, environmental chemistry, hydrogeologic conditions, engineering systems, and contaminant transformation processes collectively influence the distribution of PFAS observed during modern environmental investigations. Environmental forensic investigations that integrate these processes into a unified conceptual framework provide a more technically accurate understanding of contaminant behavior than evaluations limited to isolated environmental measurements.
More broadly, this investigation demonstrates how modern environmental consulting integrates environmental chemistry, hydrogeology, contaminant fate and transport, engineering analysis, toxicology, historical reconstruction, conceptual site modeling, groundwater science, and exposure assessment to evaluate complex industrial contamination involving persistent environmental contaminants. These multidisciplinary investigations provide scientifically supported evaluations of historical environmental conditions while remaining grounded in objective technical analysis, peer-reviewed science, and accepted environmental engineering methodologies.
This investigation was conducted under the direction of Dr. Paul Rosenfeld, an environmental scientist, environmental forensic expert, and exposure assessment specialist with more than twenty-five years of experience investigating complex environmental contamination involving industrial manufacturing facilities, groundwater contamination, drinking water impacts, hazardous chemicals, and emerging contaminants. Throughout his career, Dr. Rosenfeld has evaluated contaminant releases involving PFAS, petroleum hydrocarbons, volatile organic compounds, metals, pesticides, asbestos, combustion products, ethylene oxide, and numerous other environmental contaminants affecting occupational settings, public water supplies, groundwater resources, and surrounding communities.
As Co-Founder and Principal Environmental Scientist of RoseyFields LLC, Dr. Rosenfeld applies multidisciplinary environmental science to investigate historical industrial operations, reconstruct contaminant release histories, evaluate contaminant fate and transport, assess groundwater migration, characterize exposure pathways, perform environmental risk evaluations, and provide expert witness services in complex environmental litigation. His expertise in hydrogeology, environmental chemistry, conceptual site modeling, toxicology, air quality, groundwater investigations, environmental engineering, regulatory review, and historical records reconstruction enables RoseyFields to provide technically rigorous environmental consulting services to attorneys, consultants, regulators, insurance professionals, governmental agencies, and industry. By integrating peer-reviewed science, engineering analyses, environmental monitoring data, and decades of environmental forensic experience, Dr. Rosenfeld provides objective scientific evaluations capable of withstanding technical and regulatory scrutiny.
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