--> Application of Multicriteria Analysis to Delineate Oil-Polluted Zones in Parts of Lagos Coastline Area, Southwestern Nigeria, by O. A. Ehinola. M. A. Oladunjoye, U. G. Okwuogoli; #90037 (2005)

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Application of Multicriteria Analysis to Delineate Oil-Polluted Zones in Parts of Lagos Coastline Area, Southwestern Nigeria

O. A. Ehinola. M. A. Oladunjoye, U. G. Okwuogoli
University of Ibadan, N/A, Nigeria

Oil spillages and leakages through pipeline and flowline are causing problems to some towns/communities in southern Nigeria. The present study focused on the use of SURFER, hydrochemical and geophysical techniques to delineate oil-polluted zones in the Baruwa town aquifers and to suggest possible remedial measures. Nineteen hand-dug wells were sampled from five different localities within Baruwa town of Lagos namely: Baruwa (BAR), Fatade (FAT), Gowon Estate (GOW), Abesan (ABE), and Low Cost Housing Estate (LCH). Three control hand dug wells were also sampled from Ipaja (IPA), Asipa (ASI) and Agege (AGE) towns. Chemical and statistical analyses were carried out on the water samples to determine their quality and usage while electrical resistivity soundings were conducted to determine the aquiferous units. Hydrochemical results, vector and image graphics show that samples collected from some parts of study area were oil-polluted while, samples collected from the control wells are potable. The results of the sounding data show a system of four to five geoelectric layers with variable thicknesses. The lithounits include topsoil, saturated clay, sandy clay, sand and conglomeratic sand with average resistivity of 64, 32, 167, 278 and 1299 Um respectively. The relatively high resistivity of the first aquifer at depth less than 30m suggest hydrocarbon contamination from wells within Baruwa town while, low resistivity values were observed from the first aquifers of the control wells. However, prolific uncontaminated aquifers constitute the last layer at depth greater than 40m and could be recommended for borehole drilling in the study area. The outcome of this investigation could be used for groundwater exploration, in the area and could also be applied to the broader domain of land-use management.