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, the Clean Air and Clean Water Acts, and permitting industrial facilities.

Stephen is well versed in calculating cost-effective and health protective cleanup goals for environmental media, such as soil, sediment, groundwater, air, and through bioaccumulation into all aspects of diet (plants, animals and fish). These bioaccumulation studies have included PCBs, dioxin and dioxin-like compounds, explosives (HMX and RDX), metals, and perchlorate.

Over the course of his career, Stephen has worked with a wide range of industries including petroleum, mining, manufacturing, munitions, firing ranges, medical waste and hazardous waste incinerators, and Open Burn Open Detonation facilities. He has experience with multiple chemical mixtures and complex chemical mixtures that have direct effects and can bioaccumulate.

Stephen is a recognized expert in vapor intrusion, a field he has worked in for over 20 years. He has also provided expert reports in support of litigation involving risk assessment, toxicology and human health for residential and commercial vapor intrusion sites, refinery wastes, landfills and toxic tort litigation.

Contact Stephen Foster at This email address is being protected from spambots. You need JavaScript enabled to view it. or +1-303-243-5582.

Career Summary: Stephen Foster, Ph.D.

  • Education: Ph.D., Organic Chemistry, Imperial College of Science and Technology, United Kingdom, 1981; B.Sc., Chemistry, University of Sussex, United Kingdom, 1978
  • Practice Areas: Contaminated Site Assessment and Cleanup
  • Disciplines: Toxicological Sciences, Public Health
  • Specialties: Health Risk Assessment; Exposure Assessment; Project Management; Toxicological Studies; Permitting & Incineration; Indoor Air Risk Assessment
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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