Between November 2009 and July 2010, researchers from the HydroGeophysics Group, Aarhus University, carried out a survey in the former municipal landfill, Eskelund (Denmark). Induced polarization measurements (IP) and electrical resistivity tomography (ERT) were used to define the spatial boundaries of the dump site. The joint application of these two methods may allow the discrimination between materials displaying an identical signature in resistivity (e.g., brine and clay)