Estudos geofísicos em aterro controlado, Caçapava do Sul – RS

Abstract

An old landfill in the city of Caçapava do Sul presents a high probability of contamination on surface and ground water in the vicinity of the area. This work uses the geophysical methods of eletrical resistivity, induced polarization and ground penetrating radar, together with chemical analyzes of water to try to identify and delimit this probable contamination. The bedrock of the region is formed by metamorphic rocks at low depth, about 7 meters and fractured. The chemical analyzes of the surface waters of the area present some parameters within the considered drinking, despite the apparent contamination. Resistivity data in the area of work values with relatively low resistivities, in the order of less than 70 ohm meter, are linked to the presence of the leachate generated by the waste from the old landfill. The ground penetrating radar signal suffers a great attenuation due to the low resistivity of the área. A possible fracture was located in the electric lateral profiling section.