CONCLUSIONS
The evidence from the studies described above indicate that extensive infiltration of acid and basic fluids had taken place to the subsoil of the area.Furthermore the indirect evidence from SPT values and direct evidence from collapse in oedometer tests suggest that this infiltration probably led to settlement of the footings which contributed to the problems in the anodization and extrusion buildings.
The variability of the infiltration process and its permanence for long time, without detection of leaks or inadequate operational practices,. contribute to worsening of the problems by favouring differential settlements.
In the contaminated areas, it is desirable that the construction of any building should be preceded by careful evaluation of foundation conditions due to the possible reduction in bearing capacity inferred from the SPT values. Preferably, new buildings should be avoided in these areas for some time in order to enable further infiltration of rainwater and dissolution of existing contamination.