چكيده لاتين :
The influence oflocal hydrogeology on natural atten uation of contaminants from Iandfillieachates in
shallow aquifer underlying the active Olusosun landfill base in Lagos was investigated. In addition, the level of
groundwater contamination in the vicinity of the landfill and of leachate migration pattern in groundwater down
gradient of the landfill base was equally assessed. Landfill leachate and groundwater samples were collected and
analyzed and characterized. Physico-chemical analyses of sampled water followed standard analytical methods. Analytical
results showed a measurable impact of leachate outflows on groundwater quality. Elevated levels of anions: nitrate,
chloride and sulphate in the groundwater body and heavy metals: Cr3
, Cd and Cu, were detected at measurable levels
in groundwater down gradient of the landfill location without any particular attenuation pattern. The migration pattern
and dispersion of leachates down gradient, 750 m away from the landfill location are irregular and difficult to predict
as depicted by levels of contaminants present in groundwater. The study highlighted the importance of soil stratigraphy
beneath the landfill base as an important factor in the natural attenuation of leachate constituents in the groundwater
body.
