1. Department of Civil Engineering , Federal University of Rio de Janeiro, UFRJ , Rio de Janeiro, RJ , Brazil .
2. Department of Earth Sciences , Utrecht University , Utrecht , Netherlands .
3. Department of Applied Geology , São Paulo State University, UNESP , Rio Claro, SP , Brazil .
4. Department of Nuclear Engineering , Federal University of Rio de Janeiro, UFRJ , Rio de Janeiro, RJ , Brazil .