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Interpreting DNAPL Saturations in a Laboratory-Scale Injection with GPR Data and Direct Core Measurements

By Raymond H. Johnson1, and Eileen P. Poeter2

1United States Geologic Survey, Denver, CO
2Colorado School of Mines, Golden, CO

image of ground penetrating radar antennae on experimental sand tank

U.S. Geological Survey Open-File Report 03-349

Version 1.0
Ground penetrating radar (GPR) is used to track a dense non-aqueous phase liquid (DNAPL) injection in a laboratory sand tank. Before data reduction, GPR data provide a qualitative measure of DNAPL saturation and movement. One-dimensional (1D) GPR modeling provides a quantitative interpretation of DNAPL volume within a given thickness during and after the injection. With geologic conditions that are suitable for GPR surveys (i.e., shallow depths and low electrical conductivities), the procedures in this laboratory study can be adapted to a field site to identify DNAPL source zones after a release has occurred.

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