Geoenvironmental site investigation using different techniques in a municipal solid waste disposal site in Brazil |
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| Authors: | Giulliana Mondelli Heraldo Luiz Giacheti Maria Eugênia Gimenez Boscov Vagner Roberto Elis Jorge Hamada |
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| Institution: | 1.Department of Geotechnical Engineering,University of S?o Paulo,S?o Carlos,Brazil;2.Department of Civil Engineering,S?o Paulo State University,Bauru,Brazil;3.Department of Structures and Geotechnical Engineering,University of S?o Paulo,S?o Paulo,Brazil;4.Institute of Astronomy, Geophysics and Atmospheric Sciences,University of S?o Paulo,S?o Paulo,Brazil |
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| Abstract: | Different geoenvironmental site investigation techniques to assess contamination from a municipal solid waste disposal site
in Brazil are presented here. Superficial geophysical investigation (geoelectrical survey), resistivity piezocone penetration
tests (RCPTU), soil samples collected with direct-push samplers and water samples collected from monitoring wells were applied
in this study. The application of the geoelectrical method was indispensable to identify the presence and flow direction of
contamination plumes (leachate) as well as to indicate the most suitable locations for RCPTU tests and soil and water sampling.
Chemical analyses of groundwater samples contributed to a better understanding of the flow of the contaminated plume. The
piezocone presented some limitations for tropical soils, since the groundwater level is sometimes deeper than the layer which
is impenetrable to the cone, and the soil genesis and unsaturated conditions affect soil behavior. The combined interpretation
of geoelectrical measurements and soil and water samplings underpinned the interpretation of RCPTU tests. The interpretation
of all the test results indicates that the contamination plume has already overreached the landfill’s west-northwest borders.
Geoenvironmental laboratory test results suggest that contamination from the solid waste disposal site has been developing
gradually, indicating the need for continuous monitoring of the groundwater. |
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| Keywords: | Site investigation Tropical soils Electrical resistivity Piezocone test Contamination |
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