145 Dynamics of Natural and Built Environments (Posters)

Our communities, economies and infrastructure depend on interactions between the natural and built environments. Engineered systems (e.g. earthworks, structures, utilities) must be resilient to evolving natural forcings, and similarly engineered systems must also minimize negative effects on the natural environment.

Monday, 20 October 2025
8:00 AM - 5:30 PM
HBGCC, Hall 1

Groundwater Contamination Risk and Geophysical Assessment of the Extent of Groundwater Contamination in Solous Landfill Sites

Paper number: 145-6
Program: Technical Sessions
Time: 8:00 AM – 8:00 AM

Authors

Abstract

Improper selection of landfill sites can expose the groundwater to leachate plumes, which often results in different health challenges for people drinking from polluted aquifers. In this study, integrated groundwater risk and geophysical assessment were performed to assess the extent of contaminants in the groundwater of a landfill environment in Igando, Lagos State, Nigeria. 2D Electrical Resistivity Tomography survey was conducted using a Wenner array and the data obtained were processed to generate resistivity structures. Groundwater physical parameters were measured, correlated and compared with established standards. The resistivity inversion data was used to determine the lithology as topsoil, clay, clayey sand, and sand. The inversion results showed that the subsurface has been affected by leachate plumes up to a depth of about 16m. The contamination index of wells closer to the landfill ranges from 0.57 – 0.93. Distance decay curve reveals that groundwater contamination reduces to 50% every 60 m from the source. Threshold exceedance and principal component analyses indicate wells closer to the landfill are severely contaminated. The strong indirect correlation between temperature and distance to the landfill shows an active decomposition of solid waste in the landfills. This decomposition will bring about the formation of more leachate which might increase the extent of groundwater contamination above 16m in the study area.

Geological Society of America Abstracts with Programs. Vol. 57, No. 6

doi: 10.1130/abs/2025AM-413853

© Copyright 2025 The Geological Society of America (GSA), all rights reserved. Permission is hereby granted to the author(s) of this abstract to reproduce and distribute it freely, for noncommercial purposes. Permission is hereby granted to any individual scientist to download a single copy of this electronic file and reproduce up to 20 paper copies for noncommercial purposes advancing science and education, including classroom use, providing all reproductions include the complete content shown here, including the author information. All other forms of reproduction and/or transmittal are prohibited without written permission from GSA Copyright Permissions.