1. Assistant Professor, Dept. of Civil and Environmental Engineering, Manhattan College, 4513 Manhattan College Parkway, Riverdale, NY 10471 (corresponding author).
2. Professor, Dept. of Civil and Environmental Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, MA 02139.
3. Chief of Geotechnology, Ferrovial-Agroman, 42 Calle de la Ribera del Loira, 28042 Madrid, Spain.