Quantitative assessment of environmental processes is a powerful approach for focusing site investigations, screening remedial alternatives, and winning regulatory approval for cost-effective remedial approaches. Quantitative assessment of environmental processes involves the use of mathematical models, both analytical and numerical, to simulate the movement of fluids and fate of contaminants in the subsurface. Hydro Geo Chem, Inc. has been applying such models to problems of environmental site restoration and groundwater supply for over 20 years. Our experience includes simulating the behavior of water, gases, and non-aqueous phase liquids in both saturated and unsaturated soils.

We have not only used public domain models but have developed custom models to simulate the behavior of reactive contaminants in soil and groundwater, soil vapor extraction, and bioventing systems, design groundwater pump-and-treat systems, and predict the performance of enhanced bioremediation systems. We support our numerical modeling capabilities with advanced computer graphics to convey the results of our analyses to non-technical audiences. A few examples of our advanced numerical modeling projects are listed below.

Soil Vapor Extraction Design

Hydro Geo Chem, Inc. used specially formulated computer models to design soil vapor extraction systems for the Seymour Superfund Site in Indiana, the Pristine Superfund Site in Ohio, the Wausau Public Water Supply NPL Site in Wisconsin, and the Ninth Avenue Superfund Site in Indiana.

Bioremediation System Design

Hydro Geo Chem, Inc. developed, in collaboration with Brian Travis, a numerical biodegradation model to simulate nutrient- and oxygen-limited biodegradation in saturated and unsaturated soils. This model has been applied to evaluate both natural attenuation and enhanced bioremediation at sites in Arizona, California, Indiana, and Texas.

Fate and Transport of Reactive Contaminants

Hydro Geo Chem, Inc. formulated a custom numerical model to predict the fate and transport of reactive metals in an alluvial aquifer system. The model was also used to design and evaluate remedial alternatives.

Performance of Oxygen Release Compounds

Hydro Geo Chem, Inc. developed a numerical model specially designed to evaluate the performance of oxygen release compounds in enhancing bioremediation. The model was applied to screen remedial alternatives at a site contaminated by petroleum hydrocarbons.



Geographical Representation
of Modeling Work

Aerobic Degradation

Soil Vapor Extraction

PCE Cleanup

Alluvial Aquifer Cleanup

Particle Transport

Source Control

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