Julie Konzuk, Ph.D., PEng, (Ontario), Michelle Cho, Ph.D. (Ontario), and Frederic Cosme, CPEng, Ir. (Melbourne, Australia) will present at the 10th International Groundwater Quality Conference (GQ 2019) at the University of Liege Auditorium 500 in Liege, Belgium on September 9-12, 2019.
Julie will be delivering a keynote presentation entitled "Challenges and Considerations for Assessing and Monitoring Natural Attenuation Mechanisms, Plume Persistence, and Treatment Durations at Megasites with Complex Chemistries and Heterogeneous Environments." Michelle will be co-presenting "Field Trials of Chaotic Advection to Enhance Reagent Delivery" and Frederic will be co-presenting "Advanced and new techniques for characterizing groundwater quality, pollutant fate and subsurface systems, part 1: monitoring, fluxes..."
Julie is a Senior Principal Engineer based in Ontario with more than 20 years of experience focused on working with clients in Canada, Australia, and the United States to develop and implement cost-effective remedial strategies from the initial site assessment stage, through pre-design testing, pilot-testing, full-scale implementation, and site closure.
Michelle is a Senior Staff Professional based in Ontario focused on soil and groundwater remediation for clients in Canada, the United States, and Australia. Her technical expertise includes site characterization and remediation, data analysis/validation/management, applied research, fieldwork support, and numerical modeling.
Frederic is a Principal Engineer based in Melbourne, Australia, with more than 20 years of experience focused on environmental consulting and hydrogeology. His expertise includes converting scientific outcomes of investigations into practical remedial engineering design considerations and tangible risk-based results.
Between 1950 and 2050 the global population will have increased significantly, from 2.5 to 10 billion inhabitants. The urban population is expected to be two thirds, up from one third a century ago. The consequence is a greater urban spread into rural environments and increased pressure on natural resources, including groundwater in these transition areas. The conference theme, Groundwater quality in the transition between rural and urban environments, will focus on the need to protect, manage, repair and sustain groundwater quality in these growing urbanized environments. The conference will bring together researchers, industry, regulators, contractors, consultants, planners and water supply agencies to address the important issues related to groundwater quality in this context.
Title: Challenges and Considerations for Assessing and Monitoring Natural Attenuation Mechanisms, Plume Persistence, and Treatment Durations at Megasites with Complex Chemistries and Heterogeneous Environments
Presenter: Julie Konzuk, Geosyntec, Ontario
Time: 1:55-2:20 p.m., Thursday, September 12, 2019
Description: The presentation will focus on lessons learned and insight from experiences with assessing and monitoring natural attenuation mechanisms and long-term performance at megasites with complex groundwater chemistries and heterogeneous subsurface environments. Multiple lines of evidence are typically used to develop a holistic conceptual site model that considers all four dimensions (time and space), as natural attenuation behavior has been found to change over time and space. This improved understanding of natural attenuation has been used to better predict plume persistence and potential long-term treatment durations, and develop better-informed remedial strategies using cost-benefit analyses.
Title: Field Trials of Chaotic Advection to Enhance Reagent Delivery
Presenter: Michelle S. Cho, Geosyntec, Ontario
Co-Presenters: Felipe Solano, Canada; Neil R. Thomson, Canada; Michael G. Trefry, Australia; Daniel R. Lester, Australia; Guy Metcalfe, Australia
Time: 8:55-10:10 a.m., Thursday, September 12, 2019
Description: Effective mixing in the subsurface remains one of the biggest challenges in in situ remediation. Chaotic advection is a novel approach that has the potential to enhance contact between an injected reagent and target contaminants, and thereby improve the effectiveness of in situ treatment technologies. One configuration that can generate chaotic advection is termed the rotated potential mixing (RPM) flow. A conventional RPM flow system involves periodically re-oriented dipole flow driven by transient switching of pressures at a series of radial wells. To determine whether chaotic advection can be engineered using such an RPM flow system, and to assess the consequent impact on the spatial distribution of a conservative tracer, a series of field-scale experiments were conducted. The presentation will highlight key results from the field tests which demonstrated that chaotic advection can be engineered at the field scale, and that this engineered mixing led to improved lateral tracer spreading and approximately uniform concentrations across the monitoring network. This investigation is a critical step in the development of chaotic advection as a viable and efficient approach to enhance reagent delivery.
Title: Advanced and new techniques for characterizing groundwater quality, pollutant fate and subsurface systems, part 1 : monitoring, fluxes...
Presenter: Frederic Cosme, Australia
Co-Presenters: Joe Duran, Australia; Tamie Weaver, Australia; Camillo Coladonato, Australia
Time: 8:55-10:10 a.m., Wednesday, September 11, 2019
Description: Decision makers (e.g. site owners, regulators) face increased pressure to evaluate and, if necessary, reduce environmental risks and those risks posed by groundwater contamination are no exception. The resultant decisions are likely to reflect expectations from increasingly diverse stakeholders, including community members, that drive continued improvement in the quality, quantity, and availability of data required to characterize groundwater contamination.
This context has favored the use and development of so-called advanced site characterization techniques, which are often seen as a technological accelerator to meet the demand of higher quality data. However, there is a large diversity of technologies available, which can also be subject to a pronounced advertising or marketing focus. Although there is sound guidance on how to apply many of these techniques, there is arguably limited direction on how their implementation can result in practical outcomes that clearly support decisions regarding further investigation, monitoring, and remediation.
The possible lack of clarity regarding practical outcomes may result from a tendency to group techniques according to their operability rather than the expected outcome that they should achieve. Hence, this paper proposes to start the discussion on a different classification of these techniques in a manner that is focused more clearly on outcomes and which: (1) Assists decision-makers in better selecting and designing data collection programs and (2) Guides further technique development.
About the event: http://aimontefiore.org/GQ2019/
Learn more about Julie: https://www.geosyntec.com/people/julie-konzuk
Learn more about Michelle: https://www.linkedin.com/in/michelle-cho-49287513b/
Learn more about Fred: https://www.geosyntec.com/people/frederic-cosme