Geosyntec Consultants

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Sediment Assessment and Remediation

Geosyntec worked with a blue ribbon panel of consultants to develop engineered solutions for managing excavated sediments and preventing sediment recontamination as part of the overall remediation of Onondaga Lake near Syracuse, New York.
Geosyntec worked with a blue ribbon panel of consultants to develop engineered solutions for managing excavated sediments and preventing sediment recontamination as part of the overall remediation of Onondaga Lake near Syracuse, New York.

Geosyntec employed a mass-removal efficiency approach to demonstrate the risk reduction and cost-efficiency of its design of a Time Critical Removal Action for an NPL Site in coastal Georgia .
Geosyntec employed a mass-removal efficiency approach to demonstrate the risk reduction and cost-efficiency of its design of a Time Critical Removal Action for an NPL Site in coastal Georgia .

Geosyntec developed a strategy for selective “hot spot” sediment excavation and removal with an in situ capping / containment remedy at the Bailey Disposal Superfund site at an estuarine location along the Texas Gulf Coast.
Geosyntec developed a strategy for selective “hot spot” sediment excavation and removal with an in situ capping / containment remedy at the Bailey Disposal Superfund site at an estuarine location along the Texas Gulf Coast.

Geosyntec applies reliable and innovative approaches to the investigation, evaluation, and remediation of sediment sites to manage the performance, financial, and human health/ecological risk. Our practitioners possess the experience and technical skills to conceptualize and implement all aspects of sediment assessment and remediation programs.

Practice Specialties

We specialize in the assessment and remediation of sites where sediments have been impacted by a wide range of contaminants including metals, crude oil and refined petroleum compounds, polynuclear aromatic hydrocarbons, pesticides, and PCBs. Our conservation, remediation, and restoration experience includes sites ranging from small, intermittent flow streams to large man-made and natural lakes, as well as complex river, estuary, and harbor systems. Our multidisciplinary approach brings together nationally-recognized in-house specialists in engineering, ecology and biological sciences, risk assessment and applied toxicology, and earth sciences to address the complex issues associated with contaminated sediment management. 

Geosyntec has provided treatability testing services to support a wide variety of environmental remediation projects for more than ten years. Treatability studies provide important data for sediment management projects to help our clients and Geosyntec design engineers better understand the physical, chemical, and biological processes that can help mitigate potential risks associated with chemicals in the environment. These studies are critical for understanding and demonstrating attenuation processes that can occur in sediment if natural conditions are maintained, cap material is placed on top of sediment, or enhancements are added to the sediment or cap material.

Our skills at applying advanced tools benefit our clients in the short term through real-time data generation and adaptive site management. In the long term, clients benefit from a state-of-the-practice understanding of remedy design and implementation alternatives and an ecological risk assessment approach that looks beyond the conservative, default assumptions.

Advancing the State of the Practice

Geosyntec is pioneering sampling, analysis and data evaluation techniques as a part of the remedial investigation of the Berry’s Creek Superfund site. This includes development of new techniques for collecting deep marsh cores and innovative data evaluation processes to quantify risk on this sediment mega-site. In sediment remediation sites, our geotechnical expertise has allowed us to creatively solve challenging sediment consolidation and capping scenarios meeting regulatory requirements and exceeding project goals.

Geosyntec specialists routinely collaborate with renowned national researchers from academia and government agencies to provide innovative and defensible strategies for sites with contaminated sediments. For example, we worked with the U.S. Geological Survey to remediate chlorinated solvent-contaminated marsh sediments by applying a bioreactive mat system embedded with a dehalogenating microbial consortium that we helped develop. This project earned our client recognition as a finalist for the Service to America medal awarded by the Partnership for Public Service.

Geosyntec has current, hands-on experience with a variety of advanced assessment tools. As an example, we employed one of the first applications of rapid assessment techniques to delineate dense, non-aqueous phase liquids (DNAPL) in Hudson River sediments - a technique that allowed the real-time continuous profiling of hydrocarbon DNAPL and measuring of geotechnical properties in sediment to support engineering evaluations and design. At a site in a Louisiana bayou, we used radioisotopes of beryllium and lead to show that at least one inch of sediment had accumulated within the year preceding the survey and that site-related contaminants are being overlain by cleaner, accumulating sediments. We have also designed innovative groundwater containment systems and a soil remediation program to prevent the recontamination of waterway and harbor sediments by groundwater or stormwater runoff in busy urban waterways.

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