Risk Assessment and Applied Toxicology

Geosyntec's human health and ecological risk assessment services identify the proper approach to remediate site impacted by a wide variety of contaminants. Our risk assessment specialists work in conjunction with our remediation practitioners to develop site-specific solutions that achieve the needed levels of protection while optimizing financial commitments and operational practicalities for our clients. Our specialists also provide expert consultation and testimony on environmental exposure health issues for our legal clients. Through our technical specialists in biostatistics, epidemiology, information management, and contaminant fate and transport modeling and other specialized practitioners, we provide an exceptional quality of work that has become the envy of the industry.

Practice Specialties

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. Through our specialization in the development of site-specific approaches, we are able to characterize risk and tailor our approach to address our client’s goals and objectives for compliance, financial management, and environmental stewardship. Our practitioners have expertise in addressing complex issues associated with multi-party or high-profile sites and integrating remediation and redevelopment plans with sensitive land use designs, such as residential neighborhoods, schools, recreational facilities, or wildlife habitats. 

Geosyntec also provides specialized applied toxicology services to address a variety of health issues related to exposure to chemicals like chlorinated solvents, pesticides and herbicides, PCBs, dioxins and furans, PAHs, MtBE, BTEX; physical agents like asbestos and radionuclides; and consumer and pharmaceutical products. Attorneys utilize our distinctive capabilities to support litigation involving toxic tort, workers compensation, and product liability.

As an example of our integrated application of our risk assessment capabilities, our practitioners 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 method saved the client more than $500,000 in investigation costs when compared to more traditional statistical approaches. The analysis also accelerated the implementation of remedial action at the site. 

Advancing the State of the Practice

We are helping shape the future of risk assessment 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 assisted in the development of 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. FLUCL has received endorsements from several U.S. Environmental Protection Agency (EPA) regions and the California EPA.

Lead Consultants

  • Ravi Arulanantham, Ph.D.
    Ravi Arulanantham is a Senior Principal Toxicologist based in California with more than 20 years of experience focused on risk assessment and remediation management. He is recognized as a leader in ...
  • Karen Berry-Spark
    Karen Berry-Spark is a Senior Principal Hydrogeologist based in Ontario with more than 20 years of professional experience focused on the characterization and remediation of sites impacted by chlor ...
  • Julianna Connolly, LSP
    Julianna Connolly is a Senior Principal Engineer based in Massachusetts with more than 14 years of environmental consulting experience focusing on risk-based closure for contaminated properties, hu ...
  • Robert Ettinger
    Robert Ettinger is a Senior Principal Environmental Scientist based in California with more than 20 years of professional experience focused on the fate and transport of contaminants in the unsatur ...
  • Jason Conder, Ph.D.
    Jason Conder is a Senior Scientist based in California with more than 10 years of experience focused on risk assessment and contaminated sediments in contaminated site assessment and management, en ...
  • Ruth Custance
    Ruth Custance is a Senior Principal Environmental Scientist based in California with more than 20 years of experience focused on the development and effective communication of risk-based approaches ...
  • 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 ...
  • Stephen Foster, Ph.D.
    Stephen Foster is a Principal based in Colorado with more than 30 years of experience focused on preparing human health and ecological risk assessments for projects regulated under CERCLA, RCRA, th ...
  • Christopher Saranko, Ph.D., DABT
    Christopher Saranko is a Principal Senior Board-Certified Toxicologist based in Georgia with more than 15 years of experience focused on evaluating potential risks associated with exposures to chem ...
  • 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 ...
  • Anne Fitzpatrick, LHG
    Anne Fitzpatrick is a Senior Principal Scientist based in Washington with more than 26 years of sediment remediation experience. She has in-depth experience managing high-profile investigation 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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