Electrical Resistivity Investigation of Solid Waste Dumpsite at Rumuekpolu in Obio Akpor L.G.A., Rivers State, Nigeria

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Author(s) Ekeocha, N. E. | Ikoro Diugo Okereke | Okonkwo, S. E.
Pages 631-637
Volume 1
Issue 11
Date November, 2012
Keywords Vertical electrical sounding, leachate, resistivity, contaminant, plume.

A geophysical investigation using electrical resistivity method was conducted around a solid waste dumpsite at Rumuekpolu in Obio Akpor L.G.A of Rivers State, Nigeria to investigate the effect of waste dump on soil and groundwater resources. Vertical Electrical Sounding (VES) and 2-D resistivity imaging were used with a digital read out resistivity meter (Mc Ohm model 2115) to acquire data in the area. A contaminant leachate plume was delineated in both the VES and 2-D resistivity sections as low resistivity zones. The results were presented in terms of resistivity, thickness and depth. The 2-D were identified as bluish zones of low resistivity (less than 33.9Ωm) with the depth ranging from 39.0m to 49.8m in the entire inverse model sections. The result of the electrical resistivity survey also showed eight (8) layer geo-electric sections and an H type sounding curve. The result indicated that 6th layer VES, has low resistivity value of 55Ωm at the depth of 65.0m and thickness of 49.0m. The 8th layer VES whose depth and thickness could not be reached has a low resistivity value of 35Ωm and revealed that the groundwater around the dumpsite has been contaminated to depth exceeding 65.0m.

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