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Jeffrey Thompson

Per and Polyfluoroalkyl Substances (PFAS)

2026-07-22T10:43:17-06:00August 15th, 2018|Tags: , , , , , , , , , , , , , , , , , , , , , , , , , , , |

Our experts look at the “bigger picture” using rigorous and fundamental scientific principles. We utilize various tools in appropriate and defensible ways for client advocacy in regulatory negotiations, property transactions, claim disputes, and smart site management. Advancing the State of the Practice in PFAS Site-Specific Technical Reviews and Investigation Strategies U.S. AIR FORCE CIVIL ENGINEER CENTER, MULTIPLE CONFIDENTIAL CLIENTS Critically reviewed site-specific data, conceptual site models, and identified data gaps Prepared scientifically-rigorous PFAS ....

Groundwater Assessment and Remediation

2026-06-30T09:11:21-06:00February 11th, 2015|Tags: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |

Geosyntec’s expertise in efficient site characterization, including sites that exhibit complex groundwater-flow regimes, has distinguished our firm as a leader in groundwater assessment and groundwater remediation. Our practitioners address a broad suite of contaminants, including metals, chlorinated organic chemicals, petroleum hydrocarbons, and emerging contaminants, and use award-winning, technology-based remediation strategies that are often first-to-field. 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.

Overview of Contaminated Site Assessment and Cleanup

2026-08-18T14:34:36-06:00November 12th, 2014|Tags: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |

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. Through our use of innovative technologies and solutions, we provide our public and private sector clients with a wide array of services to address their toughest challenges. Our contaminated site practitioners guide our clients through a specialized remediation plan, consult on regulatory strategies, and develop a comprehensive cleanup approach. We can address numerous types of media, including contaminated soils, sediments, and groundwater. Advancing the State of the Practice Geosyntec's practitioners are pioneers in site assessment and remediation. Our senior practitioners have developed and authored guidance material and courses for local, state, and national agencies and associations on remediation techniques and technologies. Working with the Interstate Technical Regulatory Council, Geosyntec practitioners taught a training course on vapor intrusion, including mitigation options for the development of vapor-impacted brownfield sites. Geosyntec practitioners also wrote the guidance document on evaluating, optimizing, or ending post-closure care at impacted sites, including brownfield sites, and developed a patented approach for sub-slab vapor migration mitigation allowing residential, commercial, and industrial development on sites impacted by vapor intrusion. Our specialists routinely collaborate with prominent national researchers from academia and government agencies to provide innovative and defensible strategies for sites with contaminated sediments. For example, we collaborated with the United States Geological Survey (USGS) to remediate chlorinated solvent-contaminated marsh sediments by applying a bioreactive mat system embedded with a dehalogenating microbial consortium, a technology Geosyntec helped develop. This project and partnership earned our client recognition as a finalist for the Service to America Medal awarded by the Partnership for Public Service. Through a collaborative research project with the University of Florida, Geosyntec professionals helped develop the FLUCL software package for the Florida Department of Environmental Protection. This software is used to calculate exposure point concentration statistics in risk assessment and was the first of its kind to contain algorithms for censored datasets. FLUCL has received endorsements from several United States Environmental Protection Agency regions and the California Environmental Protection Agency. Geosyntec scientists also pioneered the use of genetic molecular tools to characterize microbes in environmental media and are engaged in applied research and development with top academic institutions around the world, including the University of Toronto, Cornell University, and the Georgia Institute of Technology.

Overview of Geotechnical and Geological Analysis, Modeling, and Engineering

2026-10-02T12:46:32-06:00November 12th, 2014|Tags: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |

Clients turn to Geosyntec's nationally recognized geotechnical and geological engineers to develop projects and services that efficiently use geotechnically challenging sites. We apply advanced technologies and leverage our proven practice leadership to provide clients with dependable, cost-effective solutions and customized services while meeting aggressive construction schedules.

Hydrogeological Characterization & Modeling

2026-04-29T11:41:56-06:00March 28th, 2014|Tags: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |

Understanding how water interacts with the surface and subsurface environment at any contaminated location is critical to designing innovative and cost-effective remediation systems and site-management strategies. By delineating and understanding the geology and hydrogeology affecting contaminated sites, our experts design strong conceptual site models and groundwater-remediation programs. Ultimately, hydrogeological characterization and modeling affects the performance of any remediation technologies deployed as a solution.

Fate and Transport and Hydrogeological Characterization

2026-08-19T13:52:10-06:00March 28th, 2014|Tags: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |

Hydrogeological characterization and fate and transport modeling affects the performance of any remediation technology deployed at a site. To effectively remediate a site and optimize the use of time and resources, contamination must be sufficiently characterized using sound judgment to interpret available data. By delineating and understanding the geology and hydrogeology, our experts design strong conceptual site models, remediate groundwater, and employ beneficial reuse of sediments.

Regulatory Strategy & Cleanup Goal Development

2026-06-30T09:19:14-06:00March 27th, 2014|Tags: , , , , , , , , , , , , , , , , , |

Geosyntec provides practical solutions and a clear vision for environmental remediation that exceed client expectations and help them earn regulatory approval of the solutions they deploy. Dynamic environmental laws and standards and evolving remediation guidance demand proactive cleanup solutions and a clear strategy for addressing regulatory requirements in order for businesses to minimize environmental risk while maintaining economic benefit. Environmental remediation projects are often complex and multi-faceted. This means reaching regulatory closure is not necessarily just about reducing contaminant concentrations below a defined threshold. A range of stakeholders usually need to be satisfied that efforts have been genuinely spent in an attempt to result in better outcomes. A successful remediation project often requires stakeholders agree and own some of the key performance indicators; understand key milestones and their implications; and gain insight on the uncertainties and contingencies to address these. Geosyntec has acquired considerable experience in regulatory advocacy and stakeholder engagement in a range of jurisdictions across the globe. Our practitioners convey complex remediation strategies in a manner that these can gain support from a range of stakeholders.  We work closely with clients to develop risk-based closure strategy and criteria, advise on site closure and reuse options, and negotiate closure criteria with key regulators Stakeholder comments are addressed to achieve consensus and approval from multiple regulatory agencies. Our environmental compliance services include helping clients obtain permits through the U.S. Environmental Protection Agency's (EPA) National Pollutant Discharge Elimination System (NPDES) program and determining the regulatory compliance of a waste storage facility under the Resource Conservation and Recovery Act (RCRA). For example, for a sediment remediation project Geosyntec worked hand-in-hand with our client, the EPA Great Lakes National Program Office, and the Michigan Department of Environment, Great lakes, and Energy on a cost share partnership throughout the investigation and remedial design process. Through this interaction we were able to identify and design a project that not only met federal and state requirements but could be implemented within the client’s available funding. Geosyntec practitioners help negotiate cleanup goals with regulatory agencies during strategy development and, of course, steer clients through the implementation of long-term remediation plans with their goals as our foremost focus.

Remediation System Operation & Optimization

2026-06-30T09:20:29-06:00March 27th, 2014|Tags: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |

The operation of expensive remediation systems, sometimes for decades, is often the result of heterogenous or fine-grained geology, fractured bedrock, restrictive criteria that are regulated down to the part per trillion level, and contaminant mass that is caught up in fine-grain soil making painfully-slow diffusion the primary mass transfer mechanism. Our practitioners are adept at expediting investigations and accelerating site closure through a wide range of innovative technology applications. At many sites with languishing remedial systems, optimization is an option that may improve mass recovery, but it may not be the ideal solution, if contaminant source zones have been inadequately characterized. Geosyntec has repeatedly demonstrated that high-resolution characterization of these zones, followed by targeted source zone removal, can optimize remedy performance and lead to the safe closure of the system. Geosyntec is frequently called upon to critically evaluate and optimize existing systems, providing solutions that range from modification to the unit operations of an ex situ treatment train to reduce chemical and energy costs as influent concentrations decrease; or incorporating flexibility into injection systems by alternating passive and active flow fields or adding additional wells in targeted source zones. When performing remedial design of a new system, Geosyntec applies these same principles of future optimization at the forefront of the design process, positioning the client for long-term savings opportunities. System optimization includes a critical evaluation of the performance monitoring plan. At large sites with sprawling networks of monitoring wells, often sampled quarterly or more, Geosyntec has successfully utilized statistical models to develop streamlined monitoring networks that effectively monitor the system, are defensible to the regulatory community, and can save clients significant monitoring costs. Decades of experience in the implementation of new, emerging, and conventional technology allows our practitioners to frequently bridge the gap between the development and "first-to-field" stages of environmental solutions. In addition, Geosyntec's in-house laboratories provide physical and chemical testing that effectively monitors the performance of treatment processes, technologies, and systems. Our technical evaluation facilities regularly conduct chemical oxidation and bioreactor tests; examine the presence of organics and inorganics in wastewater; evaluate the effectiveness of remediation products; simulate the performance of conceptual designs; and analyze the likely behavior and end point of various treatment processes. Our lab teams communicate regularly to share knowledge and direct internal and external client projects to the most appropriate technology solutions. Working together, 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. Geosyntec uses a combination of standard and developing technologies to create solutions at burdensome sites. These solutions often displace systems that have been running for many years and for which closure may have seemed impossible.

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