Abstract

Electrical methods of geophysical surveying offer a cheap and rapid way of investigating shallow geological structure and hydrogeology in and around landfills. However, the ground surface is often considerably disturbed rendering conventional methods of sounding difficult and sometimes impossible. The Offset Wenner technique provides accurate data in such difficult situations. A short review of the technique is given. The technique was applied to an unlined landfill in river gravels, and was able to define the hydrogeology sufficiently well for the development of a numerical model of contaminant transport. The case study, including the modelling, is described.