Hydrogeophysical Characterization and Monitoring of a TCE Source Zone during Enhanced In Situ Bioremediation

摘要

Robust characterization and monitoring of dense non-aqueous phase liquid (DNAPL) source zones is essential for remedial options selection, optimization and performance assessment. Where significant subsurface heterogeneity exists, conventional intrusive investigations can be limited as the information they provide is typically restricted to a relatively sparse network of vertical profiles at discrete locations, and a reliance on interpolation between the sample points to infer subsurface characteristics. Therefore significant uncertainty can remain, in terms of both lithological and hydrogeological variability. In order to mitigate this problem complimentary geophysical ground investigation methods such as electrical resistivity tomography (ERT) are being increasingly applied to these types of problems, as they have the advantage of producing spatial or volumetric information on subsurface variability.