Geosyntec Consultants

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Site Investigation and Remediation

Geosyntec personnel have addressed the in situ application of chemical reducing agents such as calcium polysulfide and ferrous sulfate for the treatment of soils impacted by hexavalent chromium.
Geosyntec personnel have addressed the in situ application of chemical reducing agents such as calcium polysulfide and ferrous sulfate for the treatment of soils impacted by hexavalent chromium.

Geosyntec often works with technology applications such as in situ thermal treatment to address challenging hydrogeological settings or recalcitrant compounds in soil and groundwater.
Geosyntec often works with technology applications such as in situ thermal treatment to address challenging hydrogeological settings or recalcitrant compounds in soil and groundwater.

Geosyntec’s design for sediment and waste relocation and encapsulation at a NPL site along the Texas Gulf Coast survived a near-direct hit from Hurricane Rita and was recommended for delisting based on the latest U.S. EPA five-year review.
Geosyntec’s design for sediment and waste relocation and encapsulation at a NPL site along the Texas Gulf Coast survived a near-direct hit from Hurricane Rita and was recommended for delisting based on the latest U.S. EPA five-year review.

Geosyntec practitioners rank among the world's top professionals in providing site assessment and remediation services at a wide range of impacted sites using innovative technologies and solutions that consistently advance the state of the practice. 

Our assessment specialists include some of the most respected and sought-after professionals in the environmental remediation industry today. We provide public and private clients a range of services for their toughest challenges, including developing and advocating successful compliance strategies, cost-effective and "goals-focused" site investigation, remediation planning engineering, remediation construction and implementation, construction management – and much more.

Geosyntec practitioners based in the United States, Canada, the United Kingdom, Ireland, Australia, and Malaysia apply advanced academic training and decades of scientific, engineering, and construction management experience to design, permit, and implement better, safer, and more cost-effective solutions for clients all over the world. Our project partners value our ability to guide them through their remediation strategy and fully explain the costs and benefits of the options available to address their particular challenge.

Our project experience spans hundreds of initiatives across the environmental remediation spectrum. A brief sample of our most successful projects includes:

  • The decommissioning and remediation of multiple refineries, NASA storage and assembly areas, and chemical manufacturing and distribution facilities;
  • The remediation and closure of dozens of industrial waste and municipal solid waste facilities, manufacturing plants, military installations, and sites regulated under CERCLA and RCRA;
  • The application of high-volume air sampling techniques to screen sites for vapor intrusion and address impacts from the presence and movement of volatile chemicals in groundwater and soil;
  • The construction of on-site disposal facilities for the long-term, safe disposal of soil and other media at sites contaminated with many types of industrial wastes, including low-level and mixed radionuclides;
  • The use of in situ and ex situ remediation technologies – such as reducing and oxidizing agents or the injection of bioaugmentation cultures – to treat metals- and perchlorate-impacted soils.

These and other site investigation and remediation solutions typically save our clients millions of dollars compared to alternative approaches, while also reducing the long-term liability associated with contaminated sites.

Advancing the State of the Practice

Geosyntec's engineers, scientists, and innovators leverage the power of chemical, physical, geological, and biological processes and reactions to detoxify, immobilize, and eliminate exposure risks to a wide range of chemicals in the environment, especially those difficult to treat by more conventional means.

Our practitioners are directly involved at the state, national, and international level with the creation of guidance on vapor intrusion investigation and mitigation; the modeling of fate and transport of contaminants in groundwater; and the development of innovative in situ remediation technologies. We pioneered the use of geochemical modeling to predict the behavior of metals in the environment and were among those to develop the first auditable, quality controlled, commercially available sequential extraction procedures for heavy metals. The method verifies geochemical model results with field data; supports risk-based decisions for site management and remediation; provides direct evidence for the transformation of metals from environmentally mobile, toxic states into sequestered, immobile, non-toxic forms; and guides land use restrictions to maintain conditions for low metals toxicity and mobility.

Additionally, Geosyntec's vapor intrusion practitioners rank among the best in the world. Our professionals published the most widely cited and used vapor intrusion model (Johnson and Ettinger, 1991), and we have performed pioneering modeling of aerobic degradation of hydrocarbon vapors with the 3-D model of Abreau and Johnson (2005). Our practitioners also have developed innovative methods to evaluate the mechanisms of subsurface vapor transport and pioneered the use of high purge volume sampling to characterize the pneumatic conductivity of unsaturated soil and bedrock using gas phase pumping tests.

We continue to make advancements in the development of real-time intelligence to meet a wide variety of environmental needs. Geosyntec’s OptiRTC computing platform, for instance, provides clients with valuable web-based data monitoring and automated control solutions for groundwater remediation sites, environmental monitoring systems, and advanced green infrastructure.


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Greg Corcoran, P.E.
Peter Zeeb, Ph.D., PG, LSP
Hari Sharma, Ph.D, PE, GE
Bertrand Palmer, Ph.D., P.E.
J. Chris Herin, P.G.
Mark Grivetti, P.G., CEG
Neal Durant, Ph.D.
J.F. Beech, Ph.D., P.E.
Evan Cox, M.Sc.
Ruth Custance
Sam Williams, P.G.
Tom Peel, Ph.D.
Nandra Weeks, P.E.
Karen Berry-Spark
Robert Ettinger
Neil Davies, C.Eng., P.E.
Tom Krug, P.E.
Michael Berman, P.E., CHMM
Thomas A. Naymik, Ph.D., P.G.
Karen Kosiarek, P.E.
Eric Nesbit, P.E.
Scott R. Drew, LSRP
Thierry Sanglerat, P.E.
Elaina Modlin, P.E.
Randy Brandt, P.G.
Peter de Haven, P.E.
Gordon Thrupp, PhD, PG, CHG
John Gallinatti, CHG
Michael McGuire, P.E.
Kwasi Badu - Tweneboah, Ph.D., PE
J. Keith Tolson, Ph.D.
Daniel A. Schauer, P.G.
Howard Cumberland
Chriso Petropoulou, PhD, PE
John Seymour, P.E.
Bruce K. Marvin, P.E.
Jeffrey G. Dobrowolski, P.E.
Scott M. Graves, P.E.
Gregory M. Gibbons, P.E.
Scott M. Luettich, P.E.
Andrew Barnes, P.G.
Robert M. Glazier, P.G.
Bruce Sass, Ph.D.
Michael Kavanaugh, Ph.D., PE
Robert Veenstra
Sean Ragain, R.G.
David Adilman, P.G.
Brian Hitchens, P.G., CHG
James R. Stout
Rich Kraft, PG, CEG, CHG
Jim Wragg, FGS
Marcus Ford, CGeol.
Paul Botek, P.G.
Cuneyt Gokmen, P.E.
Gary Wealthall, Ph.D.
Peter King, P.E., LSP, LEP
Lisa Van Tassell, P.E.
Eric Tollefsrud, P.G.
Warren Brady
Gregory Roush, P.G.
Haydar Azzouz, P.G.
Kenneth Fredianelli
Peter Dollar
P. James Linton
David J. Folkes, P.E.
Walter B. Grinyer, P.G.
Denise Tripp
Michael N. Lodato, P.G.
Beau Hodge, P.G.
James Wang, Ph.D., P.E.
Anthony Goh, P.E.
Christopher J. Saranko, Ph.D., DABT
Rula Deeb, Ph.D., BCEEM
Dale M. Prokopchak, CIH, CSP
David Reynolds, PhD, PEng
Brent Miller, P.E.
Nancy Bice, P.G., CEG
Jimmy Whitmer, P.G., CHMM
J. Andrew Montgomery, P.E.
Robert Ferree, CPG
Veryl Wittig, P.G., CHG
Jamey Rosen, P.Geo.
R. David Espinoza, Ph.D., PE
Susan Hill, P.E.
Douglas Larson, PhD, PE, LSP
Jamie deLemos, Ph.D.
Julianna Connolly, LSP
David J. Bonnett, P.E.
Daniel Duffy, P.E., PMP
Duane Graves, Ph.D.
Chad Drummond, P.E, D.WRE
Julie S. Konzuk, Ph.D., PEng
Paul L. Brookner, P.G.
Todd Creamer, P.G.
James Langenbach, PE, BCEE
Innovative Remedy for Perchlorate in Soils and Groundwater at Olin Morgan Hill Site
Innovative Remedy Application for Groundwater Treatment at Somersworth NPL Site
Slurry Wall and Cover System for Redevelopment of the McColl Superfund Site
Subsurface Barrier and Phytoenhanced Cover System Replace On-Site Landfill Remedy at Bofors Nobel NPL Site - Muskegon, Michigan
Innovative Evapo-transpirative Monocover and Groundwater Remediation at the OII Landfill Superfund Site
Marsh Sediment Removal Action and Ecological Risk Assessment - Brunswick, Georgia
Bioremediation in Overburden and Bedrock to Address Chlorinated Solvents
Implementation of an In Situ Thermal Desorption Remedy for Regulatory Site Closure
Tar Excavation and Removal from a Former Oil Refinery
Fuels Terminal Demolition at a Former Oil Refinery
Bioaugmentation to Treat Chlorinated Solvents in Fractured Bedrock
Corrective Action and LNAPL Plume Remediation at a Retail Gas Station
DNAPL Investigation in Fractured Bedrock and In Situ Chemical Oxidation for Remediation of Trichloroethene
Decommissioning and Demolition Plans and Mercury Containment Removal at a Former Chlor-alkali Manufacturing Plant - Riegelwood, North Carolina
In Situ Chemical Oxidation of TCE in Fractured Bedrock
Site Assessment and Comprehensive Remedial Strategy using Phytotechnology at a Former Wood Treating Facility and Sawmill
Comprehensive Remediation and Design/Build Services at a Buried Drum Site
Feasibility Study of Enhanced In Situ Bioremediation for a Mixed Chlorinated Solvent Source Area
In Situ Bioaugmentation for the Remediation of TCE and TCA DNAPL at a Metal Finishing Operation
Comprehensive Remediation Strategy to Address Soil and Groundwater Contamination at an NPL Site
RCRA Facility Investigation and Groundwater Remediation at the Vehicle Assembly Building
Combined Co-Solvent Soil Flushing and In Situ Bioremediation at a Former Industrial Waste Disposal Site
Preparation and Implementation of Contamination Assessment Plan for Historical Park Impacted by Former Manufactured Gas Plant Operations
Karst Hydrology Investigation and Site Preparation for Redevelopment at a Former Metalworking and Foundry Operation
Ecological Risk Assessment and RCRA Facility Investigation at a Solid Waste Management Facility - NASA Kennedy Space Center
Remedial Design/Remedial Action under CERCLA and Soil and Groundwater Remediation at a Former Manufacturing Facility
Site Investigation and Remediation of NAPL and Sampling and Analysis Plan Development for a Former Creosote Storage Facility
CAP Approach to Site/Stream Remediation and Reduction of Hydrocarbons in Fractured Bedrock Aquifer at a Former Manufactured Gas Plant
Site Characterization and Removal Response Action at a Coal Tar Site on the Hudson River, Edgewater, New Jersey
Site Investigation and Remediation of Commercial/Industrial Property in Albany, Georgia
Soil/Groundwater Remediation and Brownfields Redevelopment at Former Publishing Company Site
Electrokinetic-Enhanced Bioremediation of PCE Source Area in Clay
Design and Permitting of a Flue Gas Desulfurization Residuals Waste Landfill Over an Existing Ash Pond
Rapid Assessment and Removal of Coal Combustion Products JEA St. Johns River Power Park Area II Landfill
Site Characterization Studies for Two Coal Combustion Byproduct Storage Facilities
Chapter 24, Groundwater Monitoring and Chapter 25, Remediation of Contaminated Groundwater
Observer-dependent variability of the thresholding step in the quantitative analysis of soil images and X-ray microtomography data
Green Remediation via an Enhanced In Situ Bioremediation Solar Powered System
Self-Sustaining Treatment for Active Remediation (STAR): Introduction of a New Technique for the Remediation of MGP Sites
Self-Sustaining Treatment for Active Remediation (STAR): In Situ Field Application for the Treatment of Coal Tar in Soils
Cost Saving Measures and Liability Management during Remediation of a Former CCA Wood Treating Facility
PCB Forensics: Fingerprinting, Finger-Pointing, and a Case for Background Values
Self-Sustaining Treatment for Active Remediation (STAR): Ex Situ Field Application for the Treatment of Hydrocarbon-Impacted Soils
Field Evaluation of the Treatment of DNAPL Using Emulsified Zero-Valent Iron
Precipitation of Arsenic under Sulfate Reducing Conditions and Subsequent Leaching under Aerobic Conditions
Application of a Bimetallic Solvent Paste Technology For PCB Removal From Older Structures On DOD Facilities
Evaluation of Legacy Contamination at the Urban/Agricultural Interface
Assessing the Current and Future Impacts of the Disposal of Chromated Copper Arsenate (CCA)-Treated Wood in Unlined Landfills
Electrokinetic (EK)-enhanced Bioaugmentation for Remediation of Chlorinated Solvent Contaminated Clay
Electrokinetic Technology for Innovative Bioremediation Amendment Delivery and Bioaugmentation Strategy
An Electrokinetic Process for Removing Cu, Cr, and As from CCA-Treated Wood