Research & Development


GSI’s technical experts are at the forefront of today’s emerging environmental issues and offer innovative solutions to our industries’ most challenging problems.

GSI’s technical experts and professional staff provide cutting edge research on today’s most pressing environmental issues including emerging contaminants, contaminant fate and transport, complex hydrogeology, innovative remediation technologies, and ecotoxicity. Our goal is to provide innovative solutions to our clients’ most complex and challenging environmental issues. Our approach is data-driven, incorporating cutting-edge data visualization methods, models, and tools to develop simple, clear strategies to complex problems.

GSI is an industry leader in research and development of innovative technologies, site assessment techniques, data visualization and decision support tools. For decades, GSI’s team of technical experts has advanced cutting-edge applied research under programs such as SERDP and ESTCP, resulting in numerous technical breakthroughs, guidance documents and state of the art scientific papers to support remedial project managers for the Department of Defense, regulators, and environmental practitioners. GSI has developed numerous software products that are well-recognized in the field including BIOSCREEN, BIOCHLOR, REMChlor-MD, the Matrix Diffusion Toolkit, and the Monitoring and Remediation Optimization System (MAROS) software.

GSI maintains close collaboration with leading universities and thought leaders in the environmental industry, bringing cutting edge ideas from the laboratory to the field. GSI specializes in technology innovations in vapor intrusion measurements, remediation optimization, green and sustainable remediation analyses, methane emissions, natural attenuation evaluations, high-resolution groundwater monitoring methods, source characterization including DNAPL modeling, and innovative remedial approaches.

Related services include:


Treatment of PFAS-Impacted Water Using a Mobile Enhanced Contact Plasma System, Wright-Patterson Air Force Base,

Dayton, OH

GSI and Clarkson University designed and constructed a mobile plasma treatment system for destruction of PFAS in groundwater. The first-of-its-kind field demonstration was conducted at Wright-Patterson Air Force base and funded by the Air Force Civil Engineer Center (AFCEC). The system successfully treated hundreds of gallons of PFAS-impacted groundwater, targeting PFAS precursors, long-chain PFAS (PFOA and PFOS), and several short-chain PFAS in the source water. This project demonstrated the efficacy of the enhanced contract plasma reactor for treatment of PFAS and co-contaminants and provides the Air Force with an alternative treatment method to costly disposal options.

Long-Term Methane Emissions Rate Quantification and Alert System for Natural Gas Storage Wells and Fields,

Multiple facilities (Utah and U.S. Gulf Coast)

GSI and Utah State University employed a novel combination of measurement methods and technologies to detect and quantify average annual methane emissions from natural gas storage wells, including i) above-ground equipment leaks, and ii) ground level seepage from underground leaks near the wellbore. Representative emission factors for storage well components (e.g., valves, flanges, vents) were developed to support EPA’s Greenhouse Gas Inventory and related reporting. A novel in-ground network of sensors was deployed to monitor thermal signatures of below-ground seepage near selected wells, a technology which may serve in the future as a cost-effective early warning system for subsurface natural gas leaks.
GSI is actively coordinating the design of a passive vapor intrusion mitigation system (VMS) meeting regulatory agency performance objectives and successfully engaging in ongoing regulatory negotiations to provide a VMS with trailing, low maintenance obligations as a cost-effective solution for the client.

Improved Management of 1,4-Dioxane-Contaminated Sites,

Multiple facilities (United States).

GSI was the principal investigator of SERDP-sponsored project that developed an improved basis for decision making and management of 1,4-dioxane contaminated sites. The project was completed with team members from Rice University and UCLA using a combination of data mining, modeling, and bench-scale and field-scale studies. It established that 1,4-dioxane plumes are generally dilute and frequently similarly sized or shorter than co-occurring chlorinated solvent plumes. The study also provided evidence for attenuation, suggesting there is less risk of uncontrolled 1,4-dioxane plumes than originally anticipated. The results also generated insights on source zone characteristics, including the finding that at some sites, much of the remaining 1.4-dioxane mass may be present in low-permeability regions of the aquifer. As a result, conventional treatment may not be cost-effective or technically practical, and alternative, lower-cost management strategies such as natural attenuation may be more effective than previously thought. This research helped change the conventional conceptual model for how this emerging contaminant behaves following its release to the environment.

Contact Us

Stephen D. Richardson,
PhD, PE, PEng

Vice President, Principal Engineer

David T. Adamson,

Principal Engineer

Brandon Sackmann,

Senior Aquatic Scientist