Environmental Forensic Investigation of Industrial Chemical Fire Emissions, Air Dispersion Modeling, and Community Exposure
Project Overview
Large industrial fires involving petroleum storage terminals and bulk chemical handling facilities present some of the most technically demanding environmental forensic investigations because they combine catastrophic chemical releases, prolonged combustion, atmospheric dispersion of hazardous air pollutants, and complex community exposure pathways. Unlike routine industrial operations, uncontrolled storage tank fires generate evolving mixtures of volatile organic compounds (VOCs), particulate matter (PM), hazardous air pollutants (HAPs), combustion by-products, and petroleum-derived chemicals that may affect surrounding residential and commercial areas through inhalation, atmospheric transport, and environmental deposition. Evaluating these incidents requires integrating environmental chemistry, engineering evaluation, atmospheric science, contaminant fate and transport, exposure assessment, air dispersion modeling, historical reconstruction, and environmental data analysis into a comprehensive environmental forensic investigation.
The investigation summarized herein involved a major industrial fire at a large petroleum storage and distribution terminal containing multiple aboveground storage vessels used for bulk storage of refined petroleum products and chemical feedstocks. According to the project documentation, the incident rapidly progressed from an initial storage tank fire into a prolonged multi-source combustion event involving numerous storage vessels, secondary product releases, and repeated fire suppression activities. The response was further complicated by additional combustion events, releases of contaminated firefighting water, and recovery operations that extended environmental emissions well beyond the initial emergency response. Rather than representing a short-duration atmospheric release, the incident evolved into a complex environmental event requiring extensive engineering evaluation, environmental monitoring, atmospheric dispersion modeling, and technical interpretation over an extended period.
A principal objective of the environmental forensic investigation was to determine whether chemical emissions generated during the incident migrated beyond the facility boundary and resulted in measurable community exposure. To accomplish this objective, investigators integrated numerous independent datasets, including ambient air monitoring, meteorological observations, engineering documentation, atmospheric dispersion modeling, regulatory records, photographic documentation, odor observations, and community reports. Rather than relying solely upon regulatory monitoring data, the investigation synthesized quantitative environmental measurements with multiple qualitative lines of evidence to evaluate both the magnitude and geographic extent of potential environmental impacts.
Atmospheric transport evaluation represented another major component of the investigation. Regulatory air dispersion modeling was performed to estimate downwind concentrations of combustion-related contaminants, evaluate the influence of changing meteorological conditions on plume behavior, and compare predicted concentrations with measured environmental monitoring data. Supplemental engineering analyses refined emission parameters, combustion source characteristics, receptor grids, and model assumptions to improve representation of the fire while evaluating the sensitivity of predicted concentrations to alternative modeling approaches. These analyses were supplemented by review of continuous ambient monitoring stations, mobile air monitoring platforms, handheld monitoring instruments, and analytical sampling conducted throughout the response.
Historical reconstruction also formed an essential component of the investigation. Engineering reports, emergency response documentation, regulatory records, environmental monitoring data, photographic evidence, meteorological observations, and documented community impacts were reviewed collectively to reconstruct the progression of the incident and correlate changing combustion conditions with observed environmental effects. By integrating multiple independent lines of evidence—including atmospheric dispersion modeling, environmental monitoring, visible smoke observations, documented odors, particulate deposition, and community reports—the investigation provided a scientifically defensible framework for evaluating source attribution, contaminant transport, and community exposure associated with a complex industrial combustion event.
Finally, the investigation demonstrates how modern environmental forensic investigations extend well beyond documenting the occurrence of a fire. By integrating environmental chemistry, engineering analysis, atmospheric dispersion modeling, contaminant fate and transport, exposure assessment, historical reconstruction, and environmental data analysis, investigators developed an objective scientific evaluation of industrial emissions and potential community impacts while providing a technically rigorous framework suitable for environmental litigation, regulatory investigations, environmental consulting, and expert witness testimony.
Chemicals of Concern
Major petroleum storage fires generate chemically complex emissions because numerous refined petroleum products, fuel additives, combustion intermediates, and degradation products are released simultaneously under rapidly changing combustion conditions. Unlike controlled industrial processes, catastrophic fires involving bulk petroleum storage produce dynamic emissions whose composition evolves throughout the incident as combustion intensity, fuel availability, storage vessel integrity, and suppression activities change over time. Consequently, the environmental forensic investigation evaluated contaminant mixtures rather than isolated chemicals, recognizing that community exposure resulted from multiple concurrent emission sources acting through atmospheric transport and environmental dispersion. The investigation focused primarily on volatile organic compounds (VOCs), hazardous air pollutants (HAPs), particulate matter (PM), petroleum combustion products, and other airborne contaminants capable of affecting nearby populations through inhalation exposure.
One of the principal contaminants evaluated during the investigation was benzene, a volatile aromatic hydrocarbon commonly present in crude oil, gasoline, and numerous refined petroleum products. Because benzene readily evaporates during petroleum releases and is also generated during combustion, it served as an important indicator of both evaporative emissions and smoke-related exposure throughout the incident. Project documentation demonstrated that benzene concentrations varied considerably during the response, reflecting changes in combustion conditions, source strength, meteorological influences, and ongoing suppression activities. Given its well-established toxicological significance and widespread use as an indicator compound during petroleum release investigations, benzene played a central role in evaluating potential community exposure and atmospheric transport.
The investigation also evaluated total volatile organic compounds (VOCs) because petroleum storage fires release complex mixtures of hydrocarbons rather than individual chemicals. Environmental monitoring data demonstrated that VOC concentrations changed throughout the progression of the incident as multiple emission mechanisms—including combustion, evaporation, and product handling during emergency response—contributed to overall atmospheric concentrations. Rather than interpreting individual VOC measurements independently, investigators evaluated total VOC concentrations together with meteorological conditions, engineering observations, and atmospheric dispersion modeling to characterize the overall magnitude and distribution of airborne petroleum emissions. This integrated approach provided a more representative assessment of community exposure than evaluating individual compounds alone.
Particulate matter (PM) represented another significant contaminant of concern because combustion generated substantial quantities of smoke containing both fine and coarse particles. Fine particulate matter (PM₂.₅) was particularly important due to its ability to remain airborne for extended periods and travel considerable distances before deposition. Larger particles, including PM₁₀ and visible ash, were also evaluated because they provided additional evidence of combustion intensity, plume movement, and environmental deposition. Project documentation integrated particulate monitoring, photographic documentation, smoke observations, atmospheric modeling, and field investigations to evaluate both airborne exposure and deposition of combustion products throughout the affected area.
The investigation further recognized that catastrophic petroleum fires generate numerous hazardous air pollutants (HAPs) and incomplete combustion products that may not be comprehensively characterized through routine emergency monitoring. Depending upon combustion efficiency and fuel composition, petroleum fires can produce aldehydes, polycyclic aromatic hydrocarbons (PAHs), soot, carbon monoxide, and other combustion-derived constituents. Project documentation emphasized that environmental monitoring captured representative indicator compounds rather than every constituent present within the smoke plume. Consequently, measured concentrations were interpreted within the broader context of combustion chemistry, engineering analyses, and atmospheric transport to develop a scientifically defensible understanding of the overall emission mixture.
Finally, the investigation considered the environmental implications of fire suppression activities, recognizing that emergency response operations may introduce additional contaminant pathways beyond atmospheric emissions. Firefighting water and suppression agents have the potential to mobilize petroleum constituents and other contaminants into surface water, soils, stormwater infrastructure, and groundwater if not effectively contained. Accordingly, the environmental forensic investigation evaluated contaminant fate and transport from both airborne releases and secondary environmental pathways, providing a comprehensive assessment of chemical exposure and environmental impacts associated with the incident. This broader evaluation strengthened the overall source attribution analysis while providing a more complete understanding of potential environmental consequences following a major industrial petroleum fire.
Methods
The environmental forensic investigation employed a multidisciplinary methodology integrating historical document review, regulatory file review, engineering evaluation, environmental chemistry, atmospheric dispersion modeling, air quality assessment, contaminant fate and transport analysis, exposure assessment, meteorological evaluation, and environmental data interpretation. Because catastrophic petroleum storage fires involve multiple emission sources that evolve continuously throughout an incident, investigators relied on numerous independent datasets rather than a single analytical method. This multiple-lines-of-evidence approach allowed engineering analyses, environmental monitoring, atmospheric modeling, historical records, and documented community observations to be evaluated collectively, providing a scientifically robust framework for assessing contaminant generation, transport, source attribution, and potential human exposure.
The investigation began with a comprehensive review of incident documentation, engineering records, emergency response reports, regulatory files, environmental monitoring data, meteorological observations, and photographic evidence to reconstruct the progression of the fire. Historical reconstruction included evaluation of storage tank failures, combustion progression, emergency response activities, suppression operations, secondary releases, and recovery efforts. Establishing a detailed chronology allowed investigators to correlate changes in fire behavior with environmental monitoring results, atmospheric conditions, and engineering observations while identifying periods during which contaminant generation and community exposure were expected to vary.
Ambient air quality monitoring formed a central component of the environmental forensic investigation. Air monitoring data collected by multiple organizations using continuous monitoring stations, mobile laboratories, handheld instruments, and analytical sampling methods were reviewed to characterize concentrations of benzene, volatile organic compounds (VOCs), particulate matter (PM), and other combustion-related contaminants. Rather than interpreting individual measurements independently, investigators evaluated the complete monitoring dataset to identify temporal trends, compare results among monitoring locations, evaluate consistency between monitoring programs, and determine whether measured concentrations corresponded with documented combustion conditions and changing meteorological influences. This integrated evaluation provided a more comprehensive characterization of community air quality than isolated monitoring events alone.
Atmospheric dispersion modeling was performed using a regulatory-approved air dispersion model to estimate downwind contaminant concentrations, evaluate plume movement, and characterize the geographic extent of airborne emissions. Engineering analyses included development of source terms for benzene, total volatile organic compounds, particulate matter, and other combustion products together with evaluation of emission duration, release characteristics, meteorological inputs, receptor grids, and terrain influences. Supplemental sensitivity analyses examined alternative modeling assumptions to evaluate the influence of source parameters and atmospheric conditions on predicted concentrations. Comparing modeled concentrations with measured environmental monitoring data strengthened interpretation of contaminant transport and provided additional confidence in evaluating community exposure.
Meteorological evaluation represented another essential component of the investigation because wind direction, wind speed, atmospheric stability, mixing height, and other weather conditions strongly influence smoke dispersion and contaminant transport following large industrial fires. Investigators reviewed representative meteorological observations together with engineering analyses and atmospheric dispersion modeling to evaluate plume behavior throughout the incident. Integrating meteorological information with measured air quality data allowed investigators to distinguish changes caused by varying atmospheric conditions from those resulting from changing combustion intensity or source characteristics, thereby improving interpretation of environmental monitoring results.
The investigation further incorporated contaminant fate and transport evaluation by examining how petroleum-derived chemicals behaved following release into the atmosphere. Engineering analyses considered volatilization, atmospheric dispersion, dilution, particulate adsorption, deposition, and other environmental transport mechanisms affecting contaminant movement and persistence. Evaluating these processes provided important context for interpreting measured concentrations and understanding how airborne contaminants migrated beyond the immediate source area. Integrating environmental chemistry with atmospheric modeling and engineering evaluation strengthened the scientific basis for source attribution and exposure assessment.
Finally, all engineering analyses, environmental monitoring data, atmospheric dispersion modeling, meteorological evaluations, historical reconstruction, and contaminant fate and transport assessments were synthesized into a unified environmental forensic investigation. Conclusions were based upon the convergence of multiple independent sources of scientific evidence rather than any individual measurement, monitoring program, or analytical method. This multidisciplinary methodology provided a technically rigorous framework for evaluating industrial emissions, environmental compliance, community exposure, source attribution, and the environmental consequences associated with a catastrophic petroleum storage facility fire while supporting objective scientific conclusions suitable for environmental litigation and regulatory investigations.
Results
The environmental forensic investigation demonstrated that the incident resulted in a prolonged and evolving release of combustion products and petroleum-derived chemicals extending beyond the immediate facility boundary. Review of engineering documentation, atmospheric dispersion modeling, ambient air monitoring, historical records, and emergency response information showed that the fire progressed through multiple phases involving active combustion, secondary product releases, suppression activities, and recovery operations. Because emissions originated from several concurrent mechanisms—including combustion of petroleum products, evaporation from damaged storage vessels, and residual emissions during recovery—the environmental impacts could not be characterized by a single monitoring event or isolated sampling location. Instead, the investigation evaluated the incident as a dynamic emission source whose characteristics changed continuously throughout the response.
Ambient air monitoring demonstrated that petroleum-related contaminants were detected at numerous monitoring locations throughout the investigation period. Measurements collected by regulatory agencies, emergency responders, and independent environmental consultants documented detectable concentrations of benzene, volatile organic compounds (VOCs), particulate matter (PM), and other combustion-related constituents during multiple phases of the incident. Although measured concentrations varied according to changing meteorological conditions, combustion intensity, and source characteristics, the collective monitoring record demonstrated that airborne emissions migrated beyond the immediate source area and produced measurable changes in community air quality. The consistency of observations among multiple monitoring programs strengthened confidence in the overall environmental assessment and reduced uncertainty associated with individual measurements.
Atmospheric dispersion modeling provided an independent line of evidence supporting the environmental monitoring data. Engineering analyses demonstrated that modeled plume movement was generally consistent with documented meteorological conditions, observed smoke behavior, and measured contaminant distributions. Supplemental sensitivity analyses further showed that refinement of emission parameters, combustion source characteristics, and modeling assumptions improved representation of the fire while continuing to predict off-site transport of airborne contaminants. The close agreement between modeled dispersion patterns and measured monitoring results strengthened source attribution and provided additional confidence that observed environmental impacts were consistent with emissions generated by the industrial fire.
Historical reconstruction provided further support for the technical findings by demonstrating that environmental conditions changed in a manner consistent with documented fire progression. Review of engineering records, emergency response activities, photographic documentation, visible smoke observations, odor reports, and community observations showed that changes in reported environmental conditions closely corresponded with major developments during the incident, including changes in combustion intensity, suppression activities, and recovery operations. Evaluating these independent observations together with atmospheric modeling and environmental monitoring produced a comprehensive understanding of contaminant transport that could not have been achieved through instrumental measurements alone.
The investigation also demonstrated the importance of integrating multiple environmental datasets when evaluating large industrial fires. Air quality monitoring, engineering analyses, atmospheric dispersion modeling, meteorological evaluation, and documented field observations each contributed complementary information regarding contaminant generation, transport, and exposure. Rather than relying upon a single monitoring program or analytical technique, investigators compared numerous independent sources of evidence to determine whether the overall body of scientific information supported consistent conclusions regarding contaminant migration and community exposure. This multiple-lines-of-evidence methodology substantially strengthened the environmental forensic investigation while reducing uncertainty associated with individual datasets.
Conclusions
This environmental forensic investigation demonstrates that catastrophic petroleum storage fires require a multidisciplinary scientific approach that extends well beyond conventional emergency response or regulatory air monitoring. By integrating environmental chemistry, atmospheric dispersion modeling, engineering evaluation, contaminant fate and transport analysis, historical reconstruction, meteorological assessment, and exposure science, investigators developed a technically defensible understanding of industrial emissions and their potential environmental impacts. The investigation illustrates how multiple independent lines of evidence can be synthesized to objectively evaluate source attribution, characterize community exposure, and improve confidence in environmental conclusions while reducing uncertainty associated with any single analytical method.
More broadly, this investigation highlights the value of comprehensive environmental forensic investigations for complex industrial incidents involving hazardous air emissions, prolonged combustion, and large-scale chemical releases. Integrating engineering analyses, environmental monitoring, atmospheric science, contaminant fate and transport, exposure assessment, and historical reconstruction provides a scientifically rigorous framework for evaluating industrial emissions, supporting regulatory investigations, informing environmental decision-making, conducting human health risk assessments, and developing technically sound expert opinions in environmental litigation involving petroleum storage facilities and other complex industrial operations.
This investigation was conducted under the direction of Dr. Paul Rosenfeld, an environmental scientist and environmental forensic expert with extensive experience in environmental exposure assessment, toxicology, air quality, environmental fate and transport, risk assessment, and environmental forensics. Through RoseyFields LLC, Dr. Rosenfeld provides scientific consulting, environmental forensic analysis, regulatory support, and expert witness services involving environmental contamination, human exposure, and public health. His technical oversight helped ensure that the methodologies, scientific interpretations, and conclusions presented in this case study are consistent with accepted scientific principles and current best practices.