Staff
Company Officers and Principals
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Lucinda Jacobs, Ph.D.
President, Principal Aquatic Scientist -
Betsy Day
Vice President, Principal Sediment Scientist -
Larry F. Marx
Vice President of Corporate Development -
Russell E. Keenan, Ph.D.
Vice President, Principal Toxicologist -
Marc Lorenzen, Ph.D.
Principal Business Advisor -
Judi L. Durda
Corporate Secretary, Principal Toxicologist -
David Livermore, R.G., L.H.G.
Principal Hydrogeologist -
William Locke, P.E.
Principal Hydrologist -
James Lape
Principal Environmental Scientist, Human Health Risk Assessor -
Michael V. Ruby
Principal Scientist -
Steven O. Helgen
Principal Geochemist -
William Cutler, P.G.
Principal -
Reid M. Carscadden, P.E.
Principal Engineer
Senior Managing Scientists and Engineers
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Robert Pastorok, Ph.D.
Senior Science Advisor, Ecologist -
Scott Becker, Ph.D.
Senior Managing Ecotoxicologist -
R. Dreas Nielsen
Senior Managing Marine Scientist, Quantitative Analyst -
Les Williams, Ph.D.
Senior Science Advisor, Aquatic Ecologist -
Todd Martin, P.E.
Senior Managing Engineer, Hydrogeochemist -
Jennifer Sampson
Senior Managing Ecologist -
Randi Wexler
Senior Managing Scientist, Regulatory Affairs -
Damian V. Preziosi
Senior Managing Environmental Scientist -
Andrew Nicholson, Ph.D.
Senior Managing Scientist -
Gene Revelas
Senior Managing Scientist -
Kenneth E. Kolm, Ph.D., P.G., P.Hg.
Senior Science Advisor -
Patrick O. Gwinn
Senior Managing Scientist -
John Samuelian, Ph.D.
Senior Managing Scientist -
Marcia Greenblatt, Ph.D.
Senior Managing Engineer
Nick Varnum, R.G.
Managing Geologist
Mr. Nick Varnum is a registered professional geologist with 20 years of experience in the assessment of hydrogeology, aqueous geochemistry, and transport and fate of chemicals in hydrogeologic systems. Mr. Varnum has provided comprehensive services from initial site research and historical reviews through site characterization and analysis of remedial options and, ultimately, to the design, construction, and implementation of final corrective actions.
He specializes in managing complex sites and environmental issues for clients with multiple sites. He has developed innovative approaches for site characterization and strategies for negotiating streamlined site closures with regulatory agencies. Mr. Varnum has directed projects in the Oregon Department of Environmental Quality Voluntary Cleanup Program, UST cleanup, site response, and site assessment sections and has direct involvement in successful agency negotiations in California Regional Water Quality Control Boards, Washington State Department of Ecology, EPA Region 10 and other state and EPA regional jurisdictions. He has managed the investigation and cleanup of hazardous waste sites in the Pacific Northwest, Alaska, Hawaii, and Eastern Europe.
Mr. Varnum’s environmental litigation experience includes developing expert testimony for contaminated sites. This work has included evaluating the source, extent, and cause and timing of contaminant releases, cost allocation, developing questions for depositions, developing strategies, and technical support.
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