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An electrical resistivity survey was carried out to detect the level of groundwater pollution on Oru and Ikoto dumpsites respectively as it was observed that the dumpsites were sited ignoring the environmental and health hazard. The survey was conducted using ABEM model terrameter with schlumberger array for 1-D vertical electrical sounding (VES) of electrode spacing ranging from 0.25m to 4m. Four VES was conducted on each dumpsite with length between 1m to 120m. The data obtained from the field were interpreted using WINRESIST from which the curve types of each study area were identified. On Oru dumpsite, measurement of VES1 was taken on the dumpsite, VES2 was taken 20m away from the dumpsite, VES3 and VES4 were taken across the road serving as control. Here, there is indication of leachate pollution in VES1 (layer 2) and VES2 (layer 3) while VES3 and VES4 are leachate free, but this leachate present in VES1 and VES2 cannot penetrate into the groundwater table because of the stratigraphy of the area.Â  At Ikoto dumpsite, measurement of VES4 was taken on the dumpsite, VES1 and VES2 were taken 30m away from the dumpsite on both sides, and while VES3 was taken across the Lagos/Ibadan expressway, serving as control. There is indication of leachate pollution in VES4 (layer2) while in VES1, VES2 and VES3 there is no presence of leachate flow. The leachate present in VES4 can infiltrate into the groundwater table through the highly porous and permeable material in the subsurface layer of the location.

GEOPHYSICAL INVESTIGATION OF GROUNDWATER POLLUTION RESULTING FROM LEACHATE FLOW AT IKOTO AND ORU DUMPSITES IN OGUN STATE OF NIGERIA