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ABSTRACT. The assessment of contamination caused by improper disposal of solid waste involves integrated analysis of the physical environment, which shall range from the location of the pollutant source, flow paths and accumulation zones. The environmental diagnosis in complex aquifer systems shall clearly define the dimensions of the contaminated area by means of technical options that allow the adequate location of wells for quantification of contents. This work presents the results of the use of Electric Resistivity Tomography (ERT) in the mapping of leachate originated from the decomposition of organic matter contained in clandestinely buried residues. Eight parallel lines were carried out in addition to a reference line, in an area defined from a satellite image history. In the area occurs a geological unit composed of alternating centimetric layers of siltstones and argillites, with lenses of fine sandstone filled by carbonaceous cement, deposited in a shallow marine environment with influence of fluvial sedimentation. The analysis of the 2D inversion models based on the physicochemical characteristics of the leachate allowed the identification of individualized areas of electrical resistivity lower than the natural minimum for the area, which shall reflect zones of origin, flow and accumulation of leachate. 3D models and multilevel electrical resistivity maps generated from the inversion models allowed for the detailing of areas of low resistivity, which reveal areas of independent leachate accumulation, disconnected and at various depths, supported by a suspended aquifer system composed by levels of fine sandstone cemented. Keywords:  contamination, leachate, electrical resistivity, suspended aquifer, 3D modeling. RESUMO. A avaliacao de contaminacoes provocadas pela disposicao indevida de residuos solidos envolve a analise integrada do meio fisico, que deve abranger desde a localizacao da fonte poluidora, caminhos de fluxo e zonas de acumulacao. O diagnostico ambiental em sistemas aquiferos complexos deve claramente definir as dimensoes da area contaminada por meio de opcoes tecnicas que possibilitem a locacao adequada de pocos para quantificacao de teores. Este trabalho apresenta os resultados de uso da tomografia eletrica no mapeamento de chorume proveniente da decomposicao de materia orgânica contida em residuos enterrados de forma clandestina. Foram realizadas 8 linhas paralelas alem de uma linha de referencia, em area definida a partir de um historico de imagens de satelite. Na area ocorre uma unidade geologica constituida por camadas centimetricas alternadas de siltitos e argilitos, com lentes de arenito fino preenchido por cimento carbonatico, depositados em ambiente marinho raso com influencia de sedimentacao fluvial. A analise dos modelos de inversao 2D baseada nas caracteristicas fisico-quimicas do chorume, permitiu a identificacao de areas individualizadas de resistividade eletrica inferiores ao minimo natural para a area, que devem refletir zonas de origem, fluxo e acumulo de chorume. Modelos 3D e mapas multiniveis de resistividade eletrica gerados a partir dos modelos de inversao, possibilitaram o detalhamento das areas de baixa resistividade, que revelam zonas de acumulo de chorume independentes, desconexas e em diversas profundidades, sustentadas por sistema aquifero suspenso constituido por niveis de arenito fino cimentado. Palavras-chave : contaminacao, chorume, resistividade eletrica, aquifero suspenso, modelamento 3D.

ELECTRICAL RESISTIVITY TOMOGRAPHY (ERT) APPLIED IN THE DETECTION OF INORGANIC CONTAMINANTS IN SUSPENDED AQUIFER IN LEME CITY (BRAZIL)