Abstract
The Hanai-Bruggeman effective medium theory is used to relate bulk electrical conductivity, measured by surface and cross-borehole images, to fluid electrical conductivity, surface conductance, porosity and the geometry factor, in a medium- to fine-grained sand deposit. The change in bulk EC is caused by the presence of a landfill leachate plume. Repeated electrical images over a period of 16 months indicate that various segments of the plume are moving. The chemical constituents of the leachate plume have been determined by sampling from a bundled piezometer located in the electrical image field. Very close agreement is demonstrated between the fluid EC anomaly and the presence of elevated bulk EC indicating that the electrical images can be used to map the plume geometry and to monitor the movement of the plume segments.
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