Hydrogeophysical Characterization of the Marizal–São Sebastião Aquifer System in the Surroundings of the Limpec Sanitary Landfill, Camaçari, Bahia, Brazil

. A detailed hydrogeophysical survey was conducted using the geoelectrical method in the surroundings of the LIMPEC sanitary landfill, municipality of Camaçari, Bahia, Brazil. Twenty-six vertical electrical soundings (VESs) were done, configured according to the Schlumberger electrode array and spaced up to 400 m between current electrodes. Hydrogeological quali-quantitative information was obtained by integrating geoelectrical results to data from wells and local geology information, namely: (i) an apparent resistivity map showed the occurrence of a conductivity anomaly, possibly attributed to the contamination plume, dispersed within the saturated zone, and presenting a SSE convection direction; (ii) one-dimensional inversions allowed to interpret the stratigraphic pattern, identify static level depth and the occurrence of possible contamination plumes, and indicate the direction of groundwater flow, which was also towards SSE; (iii) two-dimensional inversions produced inverted geoelectrical profiles, with a mean error below 2%, and confirmed the occurrence of possible contamination plumes disseminated within the unsaturated zone and dispersed within the saturated one. The geoelectrical facies with the highest resistivity values (> 600 ohm.m) were related to the São Sebastião Formation. Facies with intermediate values (100 to 800 ohm.m) regarded the Marizal Formation. In turn, those with the lowest values ( 600 Ohm.m) estão atribuídos à Formação São Sebastião. Os fácies de valores intermediários (100 a 800 Ohm.m), referem-se à Formação Marizal. Já os de menores valores (<100 Ohm.m), a plumas de contaminação e/ou eventuais ocorrências de silte/argila; (iv) os parâmetros porosidade, condutividade hidráulica e transmissividade foram estimados serem entre 19,2 a 34,2%, 0,11 a 3,37 x10-3 cm/s e 4,7 a 145,6 m²/d, respectivamente; e (v) a vulnerabilidade do aquífero livre local foi classificada como alta, segundo avaliação realizada utilizando o método GOD. Palavras-chave: método geoelétrico, resíduos sólidos urbanos, parâmetros hidrodinâmicos.  How to cite: PORCIÚNCULA RJ & LEAL LRB. 2021. Hydrogeophysical Characterization of the Marizal–São Sebastião Aquifer System in the Surroundings of the Limpec Sanitary Landfill, Camaçari, Bahia, Brazil. Brazilian Journal of Geophysics, v. 39, n. 1. doi: 10.22564/rbgf.v38i3.2077