Mathematical fate and transport modeling represents another unique strength of our firm. Few other consulting organizations in the United States and abroad have conducted environmental modeling of air, water, sediments, and dust with the site-specific rigor that we have; our predictions, for example, have often been confirmed with field data.

We routinely use models such as the Industrial Source Complex Long Term (ISCLT) and California Puff (CALPUFF) air dispersion models, the Modular Three-Dimensional Finite-Difference Groundwater Flow Model (MODFLOW), and the Exposure and Fate Assessment Screening Tool (E-FAST), among others, to estimate the migration of various chemicals through environmental media. Over the past 25 years, we have assessed the fate of chemicals emitted from various point and mobile sources in no fewer than 200 different important industrial situations across the United States.

In addition, our scientists have developed unique models that have helped resolve particularly complicated scenarios. We used unique and unusual applied engineering methods, for example, to estimate historical releases of plutonium at Los Alamos based on measured soil deposits. Similarly, we were the first firm to accurately predict the ultimate fate and transport of perfluorooctanoic acid (PFOA) in the environment; this chemical’s importance has since been recognized internationally.