Human Health and Ecological Risk Assessments

Geosyntec provides human health and ecological risk assessment services as tools to identify the most appropriate approaches to remediate sites impacted by soil and groundwater contamination. We employ advanced statistical approaches to estimating the realistic risks associated with common and emerging contaminants.

Our practitioners include toxicologists, public health scientists, and other technical specialists in biostatistics, epidemiology, information management, and contaminant fate and transport modeling. Together, our engineers and scientists collaborate to develop site-specific solutions that achieve needed levels of protection while optimizing financial commitments and operational practicalities for our clients. Additionally, law firms often call upon our applied toxicology specialists to provide expert consultation on environmental exposure health issues.

We believe that there are substantial flexibilities that can be utilized and that, through the use of alternative, science-based approaches, risk assessment can be a powerful tool for site closure, redevelopment planning, and management of environmental liabilities. We specialize in the development of truly site-specific approaches to characterizing risk that are tailored to address client goals and objectives for compliance, financial management, and environmental stewardship.

Our practitioners are often retained to address the complex issues associated with multi-party or high-profile sites, where redevelopment plans call for remediation to be integrated with sensitive land uses such as residential neighborhoods, schools, recreational facilities, or wildlife habitat. Geosyntec also provides specialized applied toxicology services to address a variety of health issues related to exposure to chemicals like chlorinated solvents, pesticides/herbicides, PCBs, dioxins/furans, PAHs, MTBE, BTEX; physical agents like asbestos and radionuclides; and consumer/pharmaceutical products. Attorneys utilize our distinctive capabilities to support litigation involving toxic tort, workers compensation, and product liability.

We are also helping shape the future of risk assessment as a discipline through our applied research with colleagues in the academic, industrial, and regulatory sectors. For example, through a collaborative research project with the University of Florida, Geosyntec professionals helped develop the FLUCL software package for the Florida Department of Environmental Protection. This software is used to calculate exposure point concentration statistics in risk assessment and was the first of its kind to contain algorithms for censored datasets. Since its launch, FLUCL has been endorsed by several U.S. EPA regions and California EPA.

As one example of our integrated application of our risk assessment capabilities, we recently used a detailed spatial analysis of soil sampling results to support the averaging of composite samples in estimating exposure point concentrations for use in a risk assessment of areas adjacent to a stormwater drainage channel. Our efforts saved the client more than $500,000 in investigation costs when compared to more traditional statistical approaches. Our analysis also accelerated the implementation of remedial action at the site. At a Superfund site in California, we developed, and secured regulatory approval for, an innovative vapor intrusion model incorporating unsaturated zone biodegradation. This approach significantly reduced the number of areas of concern requiring further evaluation in the feasibility study for the site.

Lead Consultants

  • Ravi Arulanantham, Ph.D.
    Ravi Arulanantham is a Senior Principal Consultant based in California with more than 20 years of experience focused on risk assessment and remediation management. He is recognized as a leader in a ...
  • Keith Tolson, Ph.D.
    Keith Tolson is a Senior Principal Environmental Scientist based in Florida with more than 15 years of experience focused on environmental sciences. He Specializes in the application of risk-based ...
  • Lance Fontenot, Ph.D., PWS
    Lance Fontenot is a Principal Toxicologist based in Louisiana with more than 20 years of experience focused on assessing the human health and ecological effects of hazardous substance releases, and ...
Geosyntec Consultants
Geosyntec is a specialized consulting and engineering firm that works with private and public sector clients to address new ventures and complex problems involving our environment, natural resources, and civil infrastructure.

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