Geoelectric study of Abule Egba, Igando and Olushosun landfills within Lagos municipality has been\r\nundertaken to determine their hydrogeologic implications. The field technique involved vertical\r\nelectrical soundings utilizing Schlumberger electrode array. At Abule Egba, landfill materials are\r\ndefined by resistivity varying between 1.6 -m at decomposed stage and 144 -m within fresh dump.\r\nThe Igando landfill is defined by resistivity varying between 2.5 -m at decomposed stage and 26.1 -m\r\nat fresh dump. Olushosun landfill is defined by resistivity varying between 2.4 -m at decomposed\r\nstage and 51.5 -m at fresh dump. Interpretation of sounding curves showed that Abule Egba is\r\nunderlain by fairly thick column of clayey sand indicating an unconfined aquifer. Igando landfill is\r\nunderlain by thick clay column indicating a confined aquifer. The northern flank of Olushosun landfill is\r\noverlain by thin refuse dump (4.4 m) while thick refuse dump (22.9 m) overlies the central area. The\r\nhydrogeologic system at Abule Egba is vulnerable to contamination. The impermeable geoelectric\r\ncharacteristics of materials underlying Igando landfill offer the hydrogeologic system some form of\r\nprotection. At Olushosun landfill, materials of impermeable geoelectric characteristics in the northern\r\nflank offer hydrogeologic protection while fairly permeable materials in the south offer limited\r\nhydrogeologic protection.
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