1. Civil Engineer and Associate Professor, Spelman College, 350 Spelman Ln., SW, Atlanta, GA (corresponding author).
2. Civil and Forestry Engineer and Director, Deflor-Bioengenharia Ltda. Rua Major Lopes, 852-CEP 30.350-050, Belo Horizonte, Minas Gerais, Brazil.
3. Geologist and Associate Professor, Dept. of Geology, Universidade Federal de Minas Gerais, Avenida Antônio Carlos, 6627-Pampulha, CEP 31270–901, Belo Horizonte, Brazil.
4. Geologist and Regional Manager, Deflor Bioengenharia Ltda. Rua Major Lopes, 852-CEP 30.350-050, Belo Horizonte, Minas Gerais, Brazil.