Abstract

Subsurface geophysical investigation was carried out in Oru-Ijebu with the principal purpose of evaluating aquifer protective capacity of the overburden units in the area which involved forty (40) Vertical Electrical Sounding (VES) adopting Schlumberger configuration with the maximum electrode spacing of 100m at each point using OMHEGA Allied Resistivity meter while twenty(20) water samples comprising of 10 hand-dug wells and 10 boreholes were collected and subjected to geochemical analyses using Inductively Coupled Plasma-Optical Emission Spectrometry; results were compared to the drinking water standard set by appropriate health agencies. Parameters such as aquifer resistivity, aquifer thickness, overburden thickness and longitudinal conductance were calculated and used for evaluating the yields and vulnerability of the aquiferous zone to contaminant seepages. From the data interpretation, the overburden thickness ranges from