Avaliação da vulnerabilidade a contaminação das águas subterrâneas do aquífero Rio Claro na mineração Mandu, distrito de Ajapi - Rio Claro-SP

Abstract

Groundwater in the Rio Claro district is predominantly extracted from low productivity wells on the Itararé Aquifer, from depths greater than 150 m. These factors in conjunction with increasing demand for water supply have stimulated many industries to exploit the Rio Claro Aquifer, constituted by Cenozoic sediments of the Rio Claro Formation, where hydraulic properties are poorly known. For this reason, it is necessary to study the possible vulnerable to contamination punctual locations of the aquifer, in order to enable proper management of these groundwater reserves and to allow continuity of supply. Thus, this study aims to assess the vulnerability to groundwater on contamination Rio Claro Aquifer, punctually in Mandu mining site area, located in the District of Ajapi, Rio Claro - SP, the company which operates and sells industrial sand. The risk of groundwater contamination depends on the relationship between the hydrogeological characteristics of the aquifer layer (vulnerability to contamination) and the pollutant load. To evaluate the susceptibility to contamination it was applied the method GOD (FOSTER and HIRATA, 1987; FOSTER et. al., 2002) and, in addition, field and laboratory tests were performed to chacacterize the granulometry of the strata, hydraulic conductivity and some physical indices to make the evaluation more assertive and detailed. Punctual contamination vulnerability found in the aquifer Rio Claro, was moderate, which means that the aquifer is vulnerable to some contaminants, but when continuously discharged or leached. Thus, Mandu mining has a great role on preventing the emission of contaminants in the process of extraction and processing of sand... (Complete abstract click electronic access below)

A exploração de água subterrânea no município de Rio Claro ocorre predominantemente no aquífero Itararé que, além de se situar a profundidades superiores a 150 m, possui baixa produtividade. Devido a esses fatores e ao aumento da necessidade de abastecimento na região, diversas indústrias vêm explorando água do aquífero Rio Claro, representado pelos arenitos Cenozóicos da formação Rio Claro, cujo potencial e características hidráulcas são pouco conhecidas. Por este motivo, faz-se necessário o estudo de possíveis pontos de contaminação do aquífero, com vistas a possibilitar a gestão adequada deste reservatório de águas subterrânea e para permitir a continuidade do abastecimento. Assim, este estudo visa à avaliação da vulnerabilidade à contaminação da água subterrânea do Aquífero Rio Claro, de forma pontual, na mineração Mandu, localizada no Distrito de Ajapi, município de Rio Claro - SP, empresa que explora e comercializa areia industrial... (Resumo completo, clicar acesso eletrônico abaixo)