Métodos Geoelétricos no Estudo da Contaminação Subterrânea na Área do Cemitério Municipal de Rio Claro - Sp

This paper presents and discusses the applying results of electrical resistivity method, using the techniques of vertical electric sounding (VES) and 2D electrical profiling (EP), in the groundwater contamination surveying in the municipal cemetery in Rio Claro - SP, by the necrochorume. This effluent can cause soil and groundwater contamination due to the presence of elements such as nitrate, dissolved metals, viruses and bacteria, with inherent risks to human health. Such contaminant presence in the geological environment has often resulted in lower resistivity values when compared to a non-impacted area. The given characteristic allowed the application of the geophysical techniques proposed for the area, whose results allow the definition of three bands which could be seen in the resistivity profiling sections, leading to the identification of uncontaminated areas - high resistivity - areas with residual contamination - intermediate values - and probably contaminated areas - low resistivity. The groundwater flow direction definition through VES has demonstrated the concomitant migration (necrochorume) to E / NE. The geophysical result has shown correlation with the spatial and temporal cemetery occupation evolution throughout its history, once the low and high resistivity values have been respectively associated to the most ancient and most recent built regions in the cemetery area.