This paper describes a methodology used to investigate an industrial open dump for its contamination aspects and the possible time for groundwater quality recovery after the implementation of several remedial actions. After 11 years of use of the site for dumping of residues, by the combined use of modelling and geophysics, it was determined that the contamination plume was 65m wide and more than 300m long. The main pollutants are fluorides and other salts. The remedial scheme proposed is basically regrading, impermeabilising the top. As industry needs a place to dispose of its residues it was determined that the best option for the new landfill site is to continue to use the area. The residue must be pretreated to immobilise the fluorides, and the landfill will be impermeabilised at the bottom and at the top. The modelling showed that in a monitoring well 120m below the site, 3½ years after the implementation of the measures the contamination will be only 20% of the initial value, and after 6½ years the quality of the water at that point will be equal to that of the background.

This content is only available as a PDF.
You do not currently have access to this content.