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Combining Redox Potential Measurements and IP Signatures to Improve the Monitoring of a Chlorinated Solvents Plume
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Near Surface Geoscience 2013 - 19th EAGE European Meeting of Environmental and Engineering Geophysics, Sep 2013, cp-354-00100
- ISBN: 978-90-73834-38-5
Abstract
Remediation strategies for contaminated sites require accurate mid and long term monitoring methods. This is especially the case when groundwater is polluted by soluble organic contaminants such as chlorinated solvents or LNAPL (Light Non-Aqueous Phase Liquids). In general, the monitoring of remedial actions is based on water samples analyses from which geochemical parameters are derived. However this information is often limited in time and space for technical and economical reasons. As a result, a spatiotemporal uncertainty may remain on the evolution of the plume. Complementary methods, such as geoelectrical methods, can be used to reduce this uncertainty. A field experiment was conducted on a former industrial site mainly contaminated by trichloroethylene (TCE) and exhibiting natural bioremediation phenomena. A carbon source was injected to enhance the reductive dechlorination process. Geoelectrical and geochemical monitoring were carried out on the test site during this experiment. Geochemical data were integrated to geophysical results. A linear correlation between the redox potential and the IP (Induced Polarization) signatures was observed during this study.