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Groundwater Assessment and Remediation

Geosyntec provided an award-winning solution to perchlorate contamination in soil and groundwater.
Geosyntec provided an award-winning solution to perchlorate contamination in soil and groundwater.

Geosyntec partnered with USGS to commercialize a unique bacteria consortium and delivery system for groundwater seeps to tidal wetlands.
Geosyntec partnered with USGS to commercialize a unique bacteria consortium and delivery system for groundwater seeps to tidal wetlands.

Geosyntec developed a "hot spot" remediation strategy for sites at NASA's Kennedy Space Center.
Geosyntec developed a "hot spot" remediation strategy for sites at NASA's Kennedy Space Center.

Geosyntec Consultants is a global leader in the assessment and remediation of soil and groundwater impacted by a broad range of contaminants.

Our creative, dynamic engineers and scientists design and implement award-winning, technology-based remediation strategies for public and private sector clients throughout the Americas, Europe, Southeast Asia, and Australia. Our practitioners also develop comprehensive guidance on the effective management of contaminated groundwater for use by regulatory agencies in the United States and Europe addressing environmental impacts within their communities.

Geosyntec practitioners work closely with clients to fully understand their specific challenges and desired outcomes as we design and implement remediation solutions. We also guide client projects successfully through complex regulatory environments.

We continue to lead the industry with first-to-field demonstrations of new solutions based on applied research. Clients turn to Geosyntec to develop precise characterization and diagnostic tools that improve their ability to achieve site-specific remedial action objectives within a reasonable time frame using cost-effective solutions.

We are experienced in the assessment and remediation of a broad suite of contaminants, including metals, chlorinated organic chemicals, petroleum hydrocarbons, and emerging contaminants. A hallmark of our service is efficient site characterization, even at sites that exhibit complex groundwater flow regimes.  Many of our hydrogeologists specialize in modeling the fate and transport of contaminants through the most difficult types of media, including fractured and karst bedrock. 

Once a site has been characterized, we are adept at applying ex situ and in situ remedial technologies, long-term monitoring, and other site management strategies. While we are also highly experienced in conventional technologies, we are practice leaders in the application of in situ remedial technologies, including:

  • Bioremediation and bioaugmentation
  • Chemical oxidation
  • Chemical reduction
  • Thermal remediation

Advancing the State of the Practice

Geosyntec continues to partner with leading academic institutions in the development of next-generation characterization and treatment technologies. Among the technologies currently in development, testing, or analysis by Geosyntec and its subsidiaries are:

  • Electrokinetic enhanced amendment delivery, an innovative approach that uses electrokinetic mechanisms to promote migration of electron donors, electron acceptors, and bacteria for in situ bioremediation (EK-bio) or oxidants for in situ chemical oxidation (EK-ISCO);
  • Self-sustaining Treatment for Active Remediation (STAR), a smoldering combustion technology for the efficient destruction of hydrocarbons such as coal tars and oils using either an ex situ or in situ application;
  • Zero-valent metal formulations to treat recalcitrant compounds (e.g., polychlorinated biphenyls, 1,2,3-trichloropropane);
  • New microbial consortiums capable of degrading compounds such as carbon tetrachloride and 1,1,2,2-tetrachloroethene (TeCA);
  • Sustainable, low carbon footprint pump-and-treat systems, using solar power to operate the systems;
  • and 3-D visualization software applications that aid in the assessment of dense non-aqueous phase liquids and other groundwater impacts.

Among the agencies and industry colleagues using technology guidance developed by Geosyntec practitioners are the U.S. Environmental Protection Agency; the Swedish Environmental Protection Agency; the Danish Environmental Protection Agency; the U.S. Department of Defense; the National Research Council; the Electric Power Research Institute; the American Petroleum Institute; and the Interstate Technology and Regulatory Council.

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Mary deFlaun, Ph.D., BCES
David Major, Ph.D.
Peter Zeeb, Ph.D., PG, LSP
Bertrand Palmer, Ph.D., P.E.
J. Chris Herin, P.G.
Mark Grivetti, P.G., CEG
Neal Durant, Ph.D.
Evan Cox, M.Sc.
Sam Williams, P.G.
Tom Peel, Ph.D.
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.
Eric Nesbit, P.E.
Scott R. Drew, LSRP
Thierry Sanglerat, P.E.
Randy Brandt, P.G.
Peter de Haven, P.E.
Michaye McMaster
J. Gregory Menniti, P.E., P.S.
Gordon Thrupp, PhD, PG, CHG
John Gallinatti, CHG
Michael McGuire, P.E.
Chriso Petropoulou, PhD, PE
John Seymour, P.E.
Bruce K. Marvin, P.E.
Eric D. Smalstig, 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
Rich Kraft, PG, CEG, CHG
Jim Wragg, FGS
Marcus Ford, CGeol.
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
Haydar Azzouz, P.G.
P. James Linton
David J. Folkes, P.E.
Walter B. Grinyer, P.G.
Michael N. Lodato, P.G.
Beau Hodge, P.G.
James Wang, Ph.D., P.E.
Rula Deeb, Ph.D., BCEEM
David Reynolds, PhD, PEng
Brent Miller, P.E.
Nancy Bice, P.G., CEG
Todd McAlary, PhD, P.Eng.
Jimmy Whitmer, P.G., CHMM
Robert Ferree, CPG
Veryl Wittig, P.G., CHG
Jamey Rosen, P.Geo.
R. Todd Hagemeyer, P.G.
Susan Hill, P.E.
Douglas Larson, PhD, PE, LSP
Jamie deLemos, Ph.D.
Julianna Connolly, LSP
Duane Graves, Ph.D.
Julie S. Konzuk, Ph.D., PEng
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
Biodegradation of DNAPLs through Bioaugmentation Verified at NASA Kennedy Space Center LC 34 Site
Targeted Exposure-Point Treatment of Impacted Groundwater Seeps into Tidal Wetlands at Aberdeen Proving Ground
Innovative Application of Bioaugmentation in a Fractured Rock Environment at New Jersey Naval Air Warfare Center
Enhanced In Situ Bioremediation of Groundwater Impacted by Chlorinated Solvents at Intensol, LLC Site
Feasibility Study and Treatability Testing for a Danish North Sea Shoreline Site Impacted by Pharmaceutical and Related Wastes
Analysis of Subsurface Vapor Intrusion to Indoor Air and Background Conditions near a Former Refinery in Ohio
Risk Assessment of Potential Subsurface Vapor Intrusion Adjacent to a Manufacturing Plant in the United Kingdom
Remedial Investigation and Feasibility Study at the Nuclear Metals, Inc. Superfund Site
Pilot Test Evaluation of Emulsified Zero-Valent Iron for Chlorinated Solvent Source Zone Remediation at NASA KSC LC 34
Full-Scale Bioremediation of Chlorinated Solvents in Groundwater at Six Sites
Human Health Risk Asssessment and Regulatory Closure at a Site in Irving, Texas
Marsh Sediment Removal Action and Ecological Risk Assessment - Brunswick, Georgia
El Monte Operable Unit Treatment System and Conveyance Network Design
Construction of an Innovative Permeable Reactive Barrier to Passively Treat TCE within a Storm Sewer System
Bioremediation in Overburden and Bedrock to Address Chlorinated Solvents
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
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
Bioremediation of Chlorinated Solvents in Fractured Bedrock at the Caldwell Trucking NPL Site
Swedish National Guidance Manual on Chlorinated Solvent Remediation
Comprehensive Remediation and Construction for LNAPL Plume Remediation
Comprehensive Remediation Strategy to Address Soil and Groundwater Contamination at an NPL Site
RCRA Facility Investigation and Groundwater Remediation at the Vehicle Assembly Building
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
Contaminated Waste and Sediment Remediation at Bailey Superfund Site
Design/Build of Shoreline Sheet Pile Wall for Groundwater Flow Control
Electrokinetic-Enhanced Bioremediation of PCE Source Area in Clay
Coal Combustion Residuals Management Plans - Kingston Fossil Plant
Site Characterization Studies for Two Coal Combustion Byproduct Storage Facilities
Ecological and Functional Wetland Assessment and Toxicity and Sediment Testing at a Former Manufactured Gas Plant
Application of Bioaugmentation for TCE DNAPL in Fractured Bedrock
Radiolytic H2 in Continental Crust: Nuclear Power for Deep Subsurface Microbial Communities
Physical Versus Chemical Effects on Bacterial and Bromide Transport as Determined from On Site Sediment Column Pulse Experiments
Bioaugmentation for Remediation of Chlorinated Ethenes: Technology Development, Status, and Research Needs
Natural Attenuation of a Chlorinated Solvent Plume, Manufacturing Facility, Michigan
Application of a Vital Fluorescent Staining Method for Simultaneous, Near-Real-Time Concentration Monitoring of Two Bacterial Strains in an Atlantic Coastal Plain Aquifer in Oyster, Virginia
The Role of Physical, Chemical and Microbial Heterogeneity on the Field-Scale Transport and Attachment of Bacteria
A Modular Injection System, Multilevel Sampler, and Manifold for Tracer Tests
Theoretical Prediction of Collision Efficiency Between an Adhesion-Deficient Bacterium and Aquifer Sediments
Simultaneous Transport of Two Bacterial Strains in Intact Cores from Oyster, Virginia: Biological Effects and Numerical Modeling
Relative Dominance of Physical versus Chemical Effects on the Transport of Adhesion-Deficient Bacteria in Intact Cores from South Oyster, Virginia
Evaluation of Biostimulation for Treatment of a Multicontaminant Plume in a Challenging Environment
Mitigation of the Vapor Intrusion Pathway at Four Chlorinated Solvent Sites
Application of Bioremediation in Challenging Conditions
Comparison of Injection Schemes for Bioaugmentation at a TCE Site
Design of an In Situ Containment and Test Cell for Demonstrating Source Area BioRemediation (SABRe)
Project SABRE - Field-Scale Demonstration of TCE DNAPL Bioremediation
Remediation Limitations Due to Non-NAPL Source Zones: SABRE Case Study
The American Petroleum Institute Protocol for Evaluating Natural Attenuation of MTBE
Applicability of Multilevel Monitoring Well Completion Technologies for Karst Dolomite
Full-Scale Implementation of Anaerobic Bioaugmentation in an Aerobic Aquifer
Using Compound Specific Stable Isotope Analyses to Support Trichloroethene (TCE) and Methyl tert-Butyl Ether (MTBE) Biodegradation in Contaminated Subsurface Environments
Risk Management Approaches at Vapor Intrusion Sites - Chlorinated Solvents Case Studies
Geochemical and Microbiological Characterization of In Situ Reductive Dechlorination in Fractured Bedrock
Degradation of Co-Disposed Chlorinated Solvent under Anaerobic Conditions and Resulting Accelerate Degradation Rates with KB-1® Augmentation
TCE Bioremediation in a Deep Basalt Aquifer
Design and Implementation of a Pilot Test for Bioremediation of a Concentrated TCE Plume in Fractured Bedrock
Design and Construction of a Groundwater Recirculation System in Hydraulically Dynamic Fractured Bedrock
Microcosm Study of TCE Degradation by KB-1® in High Sulfate Groundwater
Efficient Three-Dimensional Characterization of TCE Transport in a Sandy Aquifer/Surface Water System
Laboratory Study of Treatment of Trichloroethene by Chemical Oxidation Followed by Bioremediation
Field Demonstration of DNAPL Dehalogenation using Emulsified Zero-Valent Iron
Quantifying Chlorinated Ethene Degradation during Reductive Dechlorination at Kelly AFB using Stable Carbon Isotopes
Advances in Molecular Technologies: Putting the Third Line of Evidence First
Performance Evaluation of Dehalogenation of DNAPLs using Emulsified Zero-Valent Iron
Optimization of Emulsified Zero-Valent Iron Particles for Reduction of DNAPL
Discussion of Environment vs. Bacteria, or, Let's Play, ‘Name that Bacteria’
Biosafety of Bioremediation Approaches in a Tetrachloroethylene-Contaminated Environment
In Situ Bioremediation of Chlorinated Solvents in Overburden and Bedrock using Bioaugmentation
Successful Bioaugmentation to Achieve Complete Dechlorination of Chlorinated Ethenes and Validation through Molecular Monitoring
Reductive Dehalogenation of DNAPLS using Emulsified Nano-Scale Zero-Valent Iron
Successful Field Demonstration of Bioaugmentation to Degrade PCE and TCE to Ethene. Bioaugmentation, Biobarriers, and Biogeochemistry
Pilot Test Evaluation of Nanoscale Iron for In Situ Remediation of Chlorinated Solvents at Edwards AFB
Field Demonstration of Biostimulation and Bioaugmentation for Remediation of Chlorinated Solvents in a Sand Aquifer
Nanoscale Zero Valent Iron: An Emerging Technology for In Situ Remediation of Halogenated Organics and Heavy Metals in Groundwater
Recent Advances in Bioremediation of Chlorinated Solvents in Groundwater
A Molecular Assay for Evaluating Performance of Natural and Engineered Bioremediation of Chlorinated Solvents
Stimuleret in situ reduktiv deklorering. Vidensopsamling og screening af lokalitete
Simultaneous Treatment of Perchlorate, NDMA, and Chlorinated Solvents using Nanoscale Iron
Modeling Fate and Transport of Chlorinated Organic Compounds in the Subsurface
Enhanced Bioremediation of DNAPLs in a Fractured Limestone Aquifer: Bench Test Results
Bioaugmentation to Enhanced Anaerobic Bioremediation of Chlorinated Solvents in Groundwater: Six Case Studies
Rapid and Complete Treatment of Trichloroethene via Bioaugmentation in an Active Biobarrier
Cometabolic and Inhibitory Interactions during Anaerobic Biodegradation of Alkylbenzene Mixtures
A GIS Technique for Estimating Natural Attenuation Rates and Mass Balances
Microbial Forensics
Multi-level Monitoring Well Completion Technologies and Their Applicability in Karst Dolomite
Enhanced Reductive Dechlorination and the Relationship between Cis-1,2-DCE Accumulation and Methanogenesis
Obstacles to Complete PCE Degradation during Reductive Dechlorination
Coupled Permeable Reactive Barrier and Natural Attenuation Remediates Chlorinated Solvents
In Situ Vinyl Chloride Biodegradation Revealed Through Carbon Isotope Composition
Cost Effective Biological/Chemical Treatment of Ammonia/Ammonium Impacted Media
The Effects of Permanganate Oxidation on Subsurface Microbial Populations
Landslide stabilization using an MSE buttress at a U.S. Superfund remediation site
Design and Construction Challenges Associated with the Redevelopment of the Avtex Superfund Site
Assessment of Degradation Pathways in an Aquifer with Mixed Chlorinated Hydrocarbon Contamination using Stable Isotope Analysis
Perchlorate-Reducing Organisms Isolated from Contaminated Sites
A Survey of In Situ Bioremediation Applications for the Reduction of Perchlorate in Soil and Groundwater
In Situ Remediation of Rocket Fuels in Groundwater: Where do We Stand Today?”
Successful Field Demonstrations of Bioaugmentation to Remediate Trichloroethene in Groundwater
In Situ Bioremediation of Chlorinated and Non-Chlorinated VOCs in Landfill Groundwater Using a Sulfate Biobarrier
Comparison of Anaerobic Dechlorinating Enrichment Cultures Maintained on Tetrachloroethene, Trichloroethene
Carbon Isotopes as a Tool to Evaluate the Origin and Fate of Vinyl Chloride: Laboratory Experiments and Modeling of Isotope Evolution
Perchlorate in Groundwater: Scope of the Problem and Emerging Remedial Solutions
Successful Field Demonstration of Bioaugmentation to Degrade PCE and TCE to Ethene
Successful Demonstration of In Situ Bioremediation of Perchlorate in Groundwater
In Situ Bioremediation of Perchlorate-Contaminated Groundwater
Engineering Controls to Protect Collections Inside a Museum During Excavation and In-Situ Treatment of MGP Residuals
Application of In-Situ Ozonation and Risk-based Approaches to Achieve Site Closure at a Former MGP Site
Bioremediation of TCE Source Area at the Mobile Launch Platform Rehabilitation Sites and Vehicle Assembly Building
Field Demonstration of Bioaugmentation of DNAPL at LC34, Cape Canaveral
Is Innovation Appropriate – A Case Study of TCE Source Remediation
Remediation Options for Pesticide-Contaminated Groundwater: Results of a Biotreatability Study
Biscayne Commons…A Lesson in Redeveloping Blighted Property into Profitable Commercial Use
Survey Says…Pump and Treat
Evaluation of a Groundwater Plume Using Innovative Techniques
Recommended Soil Gas Sampling Techniques for Vapor Intrusion Investigations
Soil Gas Sampling Methods
Designing Aqueous Amendment Delivery Systems for In-Situ Groundwater Remediation
In-Situ Bioremediation of Perchlorate: Comparison of Results from Multiple Field Demonstrations
Alpha Factors, Measured and Modeled: A Case Study
Evidence of Intrinsic Degradation in a Carbonate Aquifer
Characterizing the Vertical Profile of Contaminant Concentration and Mass Flux in Groundwater Using the Electromagnetic Borehole Flowmeter and Depth-Discrete Sampling
How Does Ethanol In Gasoline Change Things?
A Pilot-Scale Demonstration of Surfactant-Enhanced PCE Solubilization at the Bachman Road Site: (1) Site Characterization and Test Design
A Pilot-Scale Demonstration of Surfactant-Enhanced PCE Solubilization at the Bachman Road Site: (2) System Operation and Evaluation
Stimulated Microbial Reductive Dechlorination following Surfactant Treatment at the Bachman Road Site
Tools for Evaluating Enhanced Anaerobic Bioremediation for Chlorinated Solvents
Bioreactive Barriers: A Comparison of Bioaugmentation and Biostimulation for Chlorinated Solvent Remediation
Full-Scale Design of a Biobarrier. Bioaugmentation or Biostimulation?
Surfactant Flushing Pilot Test Results: Enhanced Solubilization and Biodegradability of PCE
Preventing Contaminant Discharge to Surface Waters: Plume Control with Bioaugmentation
Plume Control Using Bioaugmentation with Halorespiring Microorganisms
Surfactant enhanced aquifer remediation: application of mathematical models in the design and evaluation of a pilot-scale test.
Assessing biotic and abiotic contributions to chlorinated solvent transformation in iron reducing and sulfidogenic environments.”
Sources of Groundwater Impacts at Landfills, Is it Landfill Gas or Leachate?
The First Successful Hawaii Voluntary Response Program Site, Former Dole Cannery, Home Depot Development – How Engineering Controls Facilitated Development of Contaminated Property
Getting to Redevelopment: A Case Study of the Implementation of Engineering Controls versus Site Remediation
Vapor Control Issues and Considerations for Development of Brownfields Sites
Integration of Conventional and Innovative Technologies to Develop a Comprehensive Site Conceptual Model: Mission Valley Fuel Terminal, San Diego, California
Chromite Ore Processing Residue (COPR): Hazardous Contaminated Soil or Solid Waste
Chapter 24, Groundwater Monitoring and Chapter 25, Remediation of Contaminated Groundwater
The Need for Bioaugmentation After Thermal Treatmetn of a TCE-Contaminated Aquifer: Laboratory Experiments
Temperature Dependence of Anaerobic TCE-Dechlorination in a Highly Enriched Dehalococcoides-Containing Culture
Concurrent Ethene Generation and Growth of Dehalococcoides Containing Vinyl Choloride Reductive Dehalogenase Genes During an Enhanced Reductive Dechlorination Field Demonstration
Field Evaluation of Biological Enhanced Reductive Dechlorination of Chloroethenes in Clayey Till
Typical Contaminants in Groundwater Sampling
Green Remediation via an Enhanced In Situ Bioremediation Solar Powered System
Linking Periodic Mineralogical Transformations to Changes in Aqueous Lead and Arsenic Concentrations: Implications for Long-term Stabilization
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
Estimating the Impact of Bioremediation on DNAPL Source Area Longevity
Treatability Testing of Chromium-Impacted Groundwater with Zero-Valent Iron and Siderite
Locating Nested Monitoring Wells to Reduce Model Uncertainty for Management of a Multilayer Coastal Aquifer
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
Comparing On-Site to Off-Site Biomass Collection for Dehalococcoides Biomarker Gene Quantification to Predict In Situ Chlorinated Ethene Detoxification Potential
An Overview of Bench Scale Treatability Studies Performed to Assess Biodegradation of Contaminant Mixtures
Evaluation of Legacy Contamination at the Urban/Agricultural Interface
Unique Ecophysiology among U(VI)-reducing Bacteria as Revealed by Evaluation of Oxygen Metabolism in Anaeromyxobacter Dehalogenans Strain 2CP-C
Combining Bioaugmentation Cultures to Treat Complex Mixtures of High-Concentration Volatile Organic Compounds – Bench Test Findings
Hydrodynamic Impact on Bacterial Chemotaxis in Heterogeneous Porous Media
Quantitative Analysis of Transverse Bacterial Migration Induced by Chemotaxis in a Packed Column with Structured Physical Heterogeneity
Serving Donuts and Burning Fat: Techniques for Evaluating and Implementing Cost Effective Bioremediation Solutions
Assessing the Current and Future Impacts of the Disposal of Chromated Copper Arsenate (CCA)-Treated Wood in Unlined Landfills
Large Urban Groundwater Basins; Water Quality Threats and Aquifer Restoration
Impact of Contaminant Mass Reduction in Residuum Sediments on Dissolved Concentrations in Underlying Aquifer
Electrokinetic (EK)-enhanced Bioaugmentation for Remediation of Chlorinated Solvent Contaminated Clay
Electrokinetic Technology for Innovative Bioremediation Amendment Delivery and Bioaugmentation Strategy
Re-evaluation of Treatment Approach for a Site Contaminated with Freon-113 and 1,1,1-Trichloroethane