Dr. Gary Wealthall is a Principal Hydrogeologist and Adjunct Professor based in Toronto with more than 20 years of experience in contaminant hydrogeology research and practice.
Dr. Wealthall specializes in the development and application of high-resolution site characterization methodologies for dense non-aqueous phase liquids (DNAPLs) in fractured bedrock aquifers and aquitards and in shallow, intergranular aquifers. He recently was the project manager or director on several DNAPL remediation projects for clients in North America and Europe.
At the DuPont Chamber Works site in Deepwater, New Jersey, he developed a DNAPL screening protocol and evaluating remediation alternatives that addressed volatile organic compounds entering the sediment of the Delaware River. For the DuPont Pitt Consol Site in Newark, New Jersey, Dr. Wealthall presented a site model using state-of-the-art 3D visualizations demonstrating that the original volume estimate of soils requiring treatment could be halved, saving the client more than $20 million in remediation costs.
As a Principal Researcher with the British Geological Survey in the United Kingdom between 2005 and 2010, Mr. Wealthall led a team that focused on the application of process-based research to advance conceptual understanding of the behavior of DNAPLs in heterogeneous geological systems. His research includes modeling and a field investigation of the fate and transport of petroleum hydrocarbons for Total S.A. As part of this work, he established a revised conceptual model for light non-aqueous phase liquid migration in fractured bedrock and applied it to a site impacted by MTBE. He also examined the impacts of dewatering on the management of an unlined landfill site in a faulted mudrock sequence.
Dr. Wealthall played a pivotal role in the investigations of the fate and transport of chlorinated solvents at the ICI Runcorn site, leading to a new model for DNAPL behavior based on the discovery of extensive sediment fills in fractures. He continues to advance the state of the practice by publishing numerous articles on the fate and transport of DNAPL in aquifers and aquitards and is the co-author of a widely cited illustrated handbook on DNAPL fate and transport for the U.K. Environmental Agency. He recently joined the faculty at the University of Guelph as an Adjunct Professor and teaches a component of the university's fractured bedrock course. Dr Wealthall has delivered numerous invited lectures and has also served as an external examiner (Ph.D.) at the universities of Cambridge, Ediburgh, and Perth (Western Australia).