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Abstract
The effectiveness of various electromagnetic geophysical exploration techniques for detecting near-surface soil contaminants is described in this paper. Field tests were carried out at an industrial site containing light nonaqueous phase liquid (LNAPL) in soil. Experiment results show that the combination of ground penetrating radar (GPR), electrical resistivity and electromagnetic (EM) exploration provide a means of mapping of subsurface contamination. The region where radar signal amplitude is decreased and high resistivity appears is illustrated over areas with LNAPL contamination under site specific circumstances. Electrical resistivity and EM exploration gave the similar resistivity distribution. A relationship between contaminant saturation and dielectric constant is established based on chemical analysis and modeling of mixed material. It is necessary to understand the geophysical properties of hydrocarbon contaminants for detecting them by geophysical techniques successfully.
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