TIG Environmental uses environmental forensics to support site investigation and delineation, source identification, and allocation. We recognize that each situation is unique. By using a weight-of-evidence approach, we can design and execute each analysis to meet the project’s specific objectives.
Experience in Legacy and Emerging Contaminants
TIG Environmental’s experts have extensive experience in the forensic analysis of contaminants, including dioxins and furans, polychlorinated biphenyls (PCBs), polycyclic aromatic hydrocarbons (PAHs) and other hydrocarbons, metals, emerging contaminants such as per- and polyfluoroalkyl substances (PFAS), pharmaceuticals, and personal hygiene products.
Scaling the Analysis to the Objectives
We believe that each forensic analysis should be scaled to meet the specific project objectives. Our extensive experience and diverse forensic analysis toolbox allow us to develop a program designed to address the client’s specific needs.
Data management plans and data gap analysis that elucidate project needs early in the project life cycle
Powerful computational tools for the exploration of large and small datasets
Project planning assistance including understanding available data and historical information, determining project goals and possible outcomes, understanding the likelihood of litigation, and establishing timetable and budget
Statistical Data Analysis and Fingerprinting
TIG Environmental is a leader in the use of statistical tools ranging from simple to complex, including tools developed by our own experts. We use these tools to develop and test specific hypotheses regarding the relationships between sources and potential receptors such as impacted environment media.
Examples of our tools include:
Tools for the rapid visual analysis of sample and source profiles
Weathering models that predict changes in contaminant source profiles
Evaluation of stable isotopes for fingerprinting
Multivariate and geospatial methods that compare chemical profiles and spatial trends in samples and sources
Advanced statistical methods such as Bayesian Analysis and Monte Carlo Simulation
Historical Reconstruction and Pathway Analysis
Pathway analysis and historical reconstruction are critical lines of evidence that are often overlooked in a forensics evaluation. TIG Environmental uses pathway analysis to explore transport between sources and receptors, and we leverage our firm’s best-in-class investigative capabilities to reconstruct historical operations, including transport pathways and documented releases.
Our approach to historical reconstruction and pathway analysis includes:
Hydrodynamic and sediment transport evaluations including TIGSED™
Integration of groundwater flow and air dispersion modeling into the forensic analysis
Proprietary data analytics tools (TIGER™) to screen and triage large document productions
Best-in-class investigative and historical document review expertise
Certain situations may require scaling forensic analysis to more complex methods such as receptor modeling or source unmixing. Source unmixing methods help differentiate contaminant sources, including the number, pattern (fingerprint), and contribution of unique contaminant profiles within individual samples. Source unmixing is particularly useful for understanding complex sites with numerous source types and for allocation of contributions between parties.
Examples of our unmixing tools include:
Proprietary implementations of state-of-the-art receptor models (polytopic vector analysis [PVA] and non-negative matrix factorization [NMF/PMF])
Tools for model validation and the identification of anomalies that can identify important features or outliers in the data
TODAY'S TOOLS FOR TODAY'S CHALLENGES
TIG Environmental was able to identify multiple chemical signatures in the sediment that were consistent with specific upland operations and the insufficiency of the previous remediation of sediments, providing our client with identification of PRPs that have some liability for the sediment contamination.
PCB Forensics at a Major Superfund Site