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John Samuelian, Ph.D.

John Samuelian, Ph.D.

Dr. John Samuelian has more than 30 years of experience in environmental consulting, analytical chemistry, database development, human and ecological risk assessment, quality assurance, site investigation design, and remedial alternatives evaluation. His projects have included PCB and dioxin sites, municipal and industrial landfills, arsenals, pulp and paper mill sites, contaminated sediment sites, radiological sites, and solvent waste sites.

Patrick O. Gwinn

Patrick O. Gwinn

Mr. Patrick Gwinn has more than 25 years of experience applying his expertise in human health and ecological risk assessment, water quality, fate and transport dispersion modeling, product stewardship, air toxics sampling, and hazardous waste management. He has been instrumental in developing and leading projects aimed at establishing site-specific ambient water quality criteria and pollutant discharge limits.

R. Dreas Nielsen

R. Dreas Nielsen

Mr. Dreas Nielsen specializes in quantitative analysis of environmental data. His scientific expertise is principally in the areas of sediment contamination, chemical bioaccumulation, biological effects of contaminants, and chemical transport and fate. His approach to scientific topics stresses analytical and quantitative methods, with an emphasis on computer applications.

Barry L. Kellems, P.E.

Barry L. Kellems, P.E.

Mr. Barry Kellems is a principal engineer and project manager with more than 30 years of consulting experience, focusing on environmental remediation of contaminated sediments, groundwater, and soils. He has prepared feasibility studies, developed cleanup action plans, and served as project manager/engineer for a broad range of in situ and ex situ treatment projects.

Peter W. Zimmermann, P.G.

Peter W. Zimmermann, P.G.

Mr. Peter Zimmermann has more than 25 years of experience in the fields of hazardous waste management, environmental due diligence, hydrogeology, constituent fate and transport, conceptual remedy design, and remedial construction. He has applied this experience on site remediation assignments, real estate due diligence assessments, site restoration projects, and expert witness and litigation support work.

William Locke, P.E.

William Locke, P.E.

Mr. William Locke is a hydrologist and registered civil engineer. He has more than 25 years of experience in investigation of complex environmental systems, fate and transport assessments, remedy analysis and selection, and regulatory affairs. Mr. Locke advises a broad range of clients on scientific and engineering issues, regulatory strategy, and management of environmental assets and liabilities.