Integrated geophysical survey involving Schlumberger Vertical Electrical Sounding (VES), 2D horizontal profiling and hydro-chemical analysis have been used to map pollution plume around Sunmoye dumpsite located in the basement complex of Ikire, Southwestern Nigeria. This was with a view to assessing possible groundwater pollution arising from leachate plume emanating from the dumpsite. Seventeen (17) vertical electrical sounding (VES) and Nine (9) Wenner profiling were carried out. The 2D data obtained were processed and inverted using RES2DINV inversion software. Ten (10) water samples were collected from hand dug wells for physical and chemical analysis. The geoelectric sections and the inverted 2-D resistivity structures delineate three subsurface geological units consisting of the topsoil, weathered layer and the fractured/fresh basement rock. The weathered layer constitutes the main aquifer unit. The 2-D resistivity structures show that within the premises of the dumpsite, the topsoil and the weathered basement aquifer unit are characterized by relatively low layer resistivity values of < 40 and < 20 ohm-m respectively. The relatively low resistivity values are suspected to be due to conductive leachate from the dumpsite. Results of chemical analysis of water samples from hand dug wells in the study area shows that water samples from the area around the dumpsite are characterized by relatively higher chloride concentration of > 250 mg/l, iron concentration of > 10 mg/l and lead concentration > 0.01 mg/l which confirm groundwater pollution. It can be concluded that the soils and the groundwater in the areas around the investigated dumpsite have been polluted. The polluted zone has a depth extent of about 2.5–7.5 m.
Modeling Earth Systems and Environment – Springer Journals
Published: Apr 4, 2018
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