Abstract
A study was carried out to determine groundwater contamination levels on waste disposal sites of Ibadan city center in Nigeria. The surface areas of the sites vary between 23.5ha to 3.5acres. The field investigation included surface geological, hydrogeochemical and geochemical studies on the study area. Water samples were collected at 18 points. Three observation wells were dug in front of the open waste disposal site. Soil samples from these observation wells were collected at 15, 35 and 75 cm depths, and some heavy metals were analyzed. The results obtained show that concentrations of lead, copper and zinc in soil at the depth of 150 cm decreased with distance from the waste disposal site. The closest well to the waste site showed higher contamination than the control sites. Strictly speaking, use of groundwater drawn from wells located in proximity of the waste dumping sites should be avoided. If precautions are not taken, these contaminants may well spread with groundwater and pollute other soil resources used for agriculture in Ibadan.
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