This paper shows the results of a periodical monitoring of the contamination plume of a controlled landfill in Rio Claro, São Paulo, Brazil, using electrical resistivity geophysical method. The monitoring consisted on comparing the results of several electrical sections, performed at the same location, in the years of 1999 and 2008. Low resistivity zones, with values lower than or equal to 50 Ω.m, have been associated to contamination by leachate. Thus, it was possible to identify two directions for the contamination flows: (1) toward south, and (2) toward west. In the results of 2008, the contamination plume was more extensive and profound than in 1999. The vertical electrical soundings indicated the water table depth and the water flow directions, helping the interpretation of results of the electrical profiles.
vertical electrical sounding; electrical profile; landfill; leachate
