Environmental Health - Toxic Substances Hydrology Program
This investigation provides the science needed to understand how to economically and effectively minimize the health risks due to environmental exposures caused by fuel and oil spills in the United States.
This long-term investigation has provided an understanding of the mobilization, transport, and fate of crude oil in the shallow subsurface following accidental releases to understand the time-frame required for natural attenuation. Understanding processes and properties controlling the fate, transport, and natural attenuation of petroleum products following a spill are important to understanding the actual versus perceived risks to humans and other organisms through exposure to the contaminants associated with the spills.
The foundational work for this investigation was accomplished at the U.S. Geological Survey (USGS) Bemidji Crude-Oil Spill Research Site, Minnesota. This site was ideally suited for the initiation of the investigation because a pipeline rupture in 1979 contaminated a shallow aquifer providing a unique opportunity to study a contaminant plume where the location, amount, and timing of the spill were precisely known.
Scientists found that naturally occurring arsenic in aquifer sediments was mobilized into groundwater and attenuated through reattachment to sediments within an underground petroleum plume. Understanding these patterns identifies anthropogenic factors that affect arsenic presence and magnitude in groundwater. ...
Dr. Isabelle M. Cozzarelli received the U.S. Department of Interior's second highest honorary award—the Meritorious Service Award—for her numerous contributions to understanding the biogeochemical controls of contaminant degradation in groundwater and near-surface environments. ...
USGS scientists studying two subsurface crude-oil spill sites in Minnesota measured concentrations of oil breakdown products (metabolites) at greater concentrations than parent compound concentrations. ...
Access to all publications from this investigation.
A collection of photos illustrating this investigation's activities.
The Bemidji research team maintains it's own home page that contains additional information.
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