High Resolution 3D Geoelectrical Imaging of Quaternary River Valley Deposits at a Brownfield Site, Midlands, UK

A case study is described in which 3D electrical resistivity tomography (ERT) is used to investigate a chlorinated hydrocarbon contaminated site. The geophysical survey formed a component of a wider site investigation programme that included intrusive geological, hydrogeological and geochemical sampling. The primary goal of the 3D ERT survey was to characterise the thickness and lithological variations within the superficial deposits covering the site, and to assist in identifying suitable targets for the intrusive sampling programme. Interpretation of the 3D resistivity model has been aided by data collected from borehole sampling and cone penetration tests (CPT).