Assessment of Groundwater Contamination due to Leachates From an Open Dumpsite Using Geoelectrical Resistivity Imaging

摘要

2D geoelectrical resistivity measurements have been conducted to investigate ground water contaminations at a non-engineered, open dumpsite facility in Lagos, southwestern Nigeria. The inferred lithologies from the inverse model of the 2D imaging includes topsoil, sandy-clay and sandy units; while the delineated low resistive top layer has resistivity values ranging 0.64-7.5 typical of leachates, localized within sandy-clay unit extending to depths 42-52 m. The groundwater from the minor aquifer units at shallow depths are observed to be hazardously contaminated in the study area where household, market and industrial wastes are known to be disposed improperly. It is, therefore, recommended that deeper aquifers beyond the contaminated layers are safe to drill with screened borehole in order to avert immediate groundwater pollution within the study area.