1. 2D GEOPHYSICAL EVALUATION OF SUB-SOIL CONTAMINATION - A CASE STUDY.
- Author
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Ameloko, A. A. and Ojigbo, O. O.
- Subjects
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GEOPHYSICS , *SUBSOILS , *SOIL pollution , *HYDROCARBONS , *IMAGING systems - Abstract
In this study, 2D surface resistivity survey was undertaken around two power houses in Covenant University Ota in Ogun State, Nigeria to investigate the possible spread within the subsurface, of disposed used hydrocarbon products. The 2D resistivity imaging technique using the Wenner array method was adopted for the survey with the aid of the SAS 1000 Terrameter. Five traverses were occupied with two of them (traverses 1and 4) obtained 3 m away from the two power houses, while the remaining three served as control. The study delineated three subsurface geoelectric layers with resistivity values ranging from 57 Ωm to 1258 Ωm on all the profiles. The inferred lithologies from the 2D resistivity inversion are topsoil, sandy clay and lateritic materials. The high resistivity values (800 Ωm - 1258 Ωm) on traverse 1 near the power house behind College of Science and Technology (CST) building may be as a result of the contamination arising from the disposed hydrocarbon products. Traverses 2 to 5 however showed no evidence of contamination of the soil around the study area. The results of the analysis have shown that no appreciable amount of contamination has been observed as a result of the disposal of used hydrocarbon products around the study area. However, continuous disposal of used diesel and other hydrocarbon products around the power houses in the University pose a lot of danger of contamination to the environment and underground water body with time. [ABSTRACT FROM AUTHOR]
- Published
- 2015