Andrew Thalheimer

Andrew Thalheimer



Andrew has over 30 years of experience in conducting and managing contaminated sites including phased environmental site investigations, risk assessment,  remedial alternative evaluation, remediation design and engineering, construction site supervision, groundwater monitoring, and environmental risk management. He has managed numerous sites involving complex hydrogeologic settings and contaminant transport modeling, including LNAPL. He is a recognized expert in AFFF management and has made numerous presentations to industry on how to manage and mitigate potential impacts associated with PFAS.  Andrew has also co-authored papers on groundwater flow and contaminant transport in fractured bedrock, vapour intrusion monitoring, and environmental effects monitoring.

Firefighting training area in action

Extinguishing Fires and Firefighter Training at North American Airports

For decades, airports in North America have been extinguishing fires and performing firefighter training using aqueous film-forming foam (AFFF) containing per- and poly-fluoroalkyl substances (PFASs). While PFASs principally provide the efficacy of AFFF as a firefighting agent against Class B fires, the discharge and release of AFFF containing PFASs to the environment presents potentially unacceptable human health and ecological risks. In 2015, Dillon was retained by the National Academy of Sciences for the Airport Cooperative Research Program (ACRP) to identify best management practices associated with management of AFFF-containing PFASs at airports.

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FTA excavation complete, backfilling begins, 2015

Cambridge Bay Airport Remediation - Victoria Island, NU

The Cambridge Bay Airport Apron Area and Fire Training Area (FTA) required remediation of lead-impacted materials and petroleum hydrocarbons (PHCs) relative to the historical use of fuel storage tanks and fueling related activities at the airport. Two land treatment units (LTUs) for each area were constructed over the course of three years to manage the hydrocarbon-impacted soil.  

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