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The long-going petroleum exploitation in the Section Cocu determined the increase of chloride concentrations in groundwater. The aquifer system in this area comprises four aquifers, with different extensions, separated by semipervious units. The third and the fourth aquifer are more extended. The third aquifer is in direct relationship with potential pollution sources, such as oil wells and oil pipelines and it is drained by the River Cotmeana. Several monitoring wells were drilled for the purpose of this study, p...