Application of electrical resistivity techniques in the investigation of groundwater contamination: A case study of Ile – Epo Dumpsite, Lagos, Nigeria

摘要

2D resistivity imaging and vertical electrical sounding (VES) surveys were integrated in the study of the investigation of the level of groundwater contamination at Ile – Epo dumpsite in Agbado Oke-Odo Local Council Development Area (LCDA), Lagos State, Southwestern, Nigeria. A total of nine vertical electrical soundings and four 2D electrical imaging using Wenner configurations was used for the study. Out of these, six VES and three 2D electrical imaging were carried out on the dumpsite while three VES and one 2D imaging were carried out in a school 100m away from the dumpsite in order to serve as control. The result of interpretation of both data suggests that the study area is underlain by sand and clay formations. Results of the resistivity Imaging delineated the contaminant plume as low resistivity zones (0.5 – 48 Ωm). This was also correlated with the VES values of 0.1 to 31.6 Wm which indicate contaminant plume. This was observed to have infiltrated to a depth of about 50m which poses serious health risks to the inhabitants of that area.