Abstract
A geophysical investigation involving Vertical Electrical Sounding (VES) using the Schlumberger array was carried out at the Isa Kaita College of Education specifically at the Male Hostel. The aim of the investigation is to explore the groundwater contamination of the area with the objectives: to determine the depth to basement of the study area, to determine the aquifer thickness, to determine the depth to aquifer, to determine the conductivity of the aquifer and to determine the thickness of topsoil and its variation in resistivity. A total of four (4) vertical electrical soundings were carried out using Schlumberger configuration. Terrameter signal averaging system (SAS) model 300 was the instrument used. The survey area is dominated by mainly four layers, namely: Topsoil, Weathered basement, fractured basement. The value of VES 03 and VES 04 have high electrical conductivities which likely shows they are contaminated, The topsoil resistivity along the profile ranges from approximately 1 to 154, The depth to basement (basement topography) Varies from 4.94 m to 7.59 m, The thickness of aquifer range from 1 m to 6.8 m. Therefore VES 02 has high Potential for groundwater because it has retaining capacity and good aquifer thickness and is therefore recommended for borehole establishment. It is recommended that the management of Isa Kaita College of Education should provide a concrete dumping site to avoid leaching of waste in ground thereby contaminating the groundwater.
Highlights
The most common disposal practice involves dumping of organic waste in open receptacle place in different location on the study area
Electrical resistivity method is preferred in groundwater study to its high resolving power, economic viability and it’s minimal to non-invasiveness researchers have used electrical resistivity method in characterizing groundwater problem related to contamination by delineating zones of leachate generation, migration and there extent of contamination, (Bayowa, 2015, Abdullahi et al 2013) The use of electrical resistivity method is very important in environment monitoring and assessment, This method is based on the response of the surface to the flow of current and the vertical electrical surrounding employed measured the vertical variation of resistivity with depth
Base on the results of the interpreted Vertical Electrical Sounding (VES) data the resistivity of the topsoil varies from 154 m to 115 Ωm with an average value of 134.5 Ωm
Summary
The most common disposal practice involves dumping of organic waste in open receptacle place in different location on the study area. The contamination to aquifer depends on factors such as the depth of water table, concentration of contaminant, permeability of subsurface layers, geological setting and the direction of groundwater flow.
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