Dr. Eberle has developed expertise in site characterization, emerging contaminants, litigation support, and innovative remediation technologies. He also has experience with the characterization and remediation of soil and groundwater contaminated with both priority pollutants and emerging contaminants. His experience with innovative remediation technologies includes field testing of a Direct Push Technology Jet Injection method to emplace zero-valent iron in clay-till for the treatment of chlorinated solvents. Dr. Eberle's experience with emerging contaminants includes working on sites contaminated with per- and polyfluoroalkyl substances (PFAS) and 1,4-dioxane, along with lead authorship on publications in Chemosphere and Environmental Science and Technology.
Practical Application of PFAS Forensics
Increasingly when we detect PFAS in the environment we need tools to differentiate sources, timing of releases, define background concentrations, and determine if the detected PFAS originated from a single source, multiple sources, or if detections represent “anthropogenic background” not clearly associated with a distinct process or release. As PFAS forensics emerges as a field many of the forensic techniques that have been established for other complex contaminant mixtures, such as PAHs and PCBs, are also being utilized to develop distinct PFAS “fingerprints” and identify sources. In addition, the complex chemistry of PFAS has also led to several novel forensic techniques unique to PFAS. This presentation will provide an overview of PFAS forensic techniques and discuss several “real world” case studies. This presentation will demonstrate how to contextualize results in order to effectively communicate PFAS forensics to both clients and regulators, particularly when attempting to identify and differentiate sources.
DPT Jet Injection: Remediation of Chlorinated Solvents in a low-permeability Clay Till Source Zone demonstrated by 6 Years of high resolution performance monitoring
This presentation will provide a case-study evaluation of Direct-Push Technology Jet Injection (DPT-JI) for the remediation of chlorinated volatile organic compounds (CVOCs) in low-permeability soils largely inaccessible to conventional injection technologies. In this six year-long study DPT-JI was used to inject 49 tonnes of zero valent iron into a clay-till source zone in Nivå, Denmark (the Site) for treatment of CVOCs. Soil samples collected four years after remedy emplacement showed that the estimated mass of total CVOCs (as trichloroethene [TCE]) in soil had decreased by 82%. Groundwater samples collected five years after remedy emplacement showed that the total estimated mass of CVOCs (as TCE) in Site groundwater had decreased by approximately 75% and total CVOC discharge out of the TTA had decreased by 94%. In this presentation the results of the sixth and final year of performance monitoring will be presented including the final rounds of soil and groundwater sampling.