Determination and Delineation of Groundwater pollution from leachate generated from dumpsite, Ijagun community Odogbolu southwestern Nigeria

Abstract

The research examined the extent of pollution by leachate generated from Ijagun dumpsite, Odogbolu Area, Southwestern Nigeria, on the groundwater using electrical resistivity method. Four vertical electrical sounding measurements were taken around the dumpsite, Two on the dumpsite (VES 1/ VES 2), and the other two (VES 3 /VES 4) around the dumpsite (serving as control) using schlumberger array technique. The result obtained interpreted both quantitatively and qualitatively, iterated with WINRESIST software. From the computer output, three curve types were obtained from the field survey (A, H, KHA). There is indication of the presence of the contamination in the VES 1 (layer 2) and VES 2 (layer 2) due to their low resistivity values while there are yet no pollution in VES 3/ VES 4 due to their high resistivity values compare to that of VES 1 and VES 2. The stratigraphy at the dumpsite consisting of Sand, Dry sand and Sandstone which shows that the dumpsite is situated on aquiferous materials that is highly porous and permeable and may aid the free flow of leachate into the groundwater. Therefore, there is need for drinking water quality assessment to determine the suitability of the groundwater for human and industrial consumption.