1. Professor, Dept. of Civil and Materials Engineering, Univ. of Illinois at Chicago, 842 West Taylor St., Chicago, IL 60607 (corresponding author).
2. Graduate Research Assistant, Dept. of Civil and Materials Engineering, Univ. of Illinois at Chicago, 842 West Taylor St., Chicago, IL 60607.
3. Geotechnical Engineer, S.A.M. Consultants Inc., 407 Eisenhower Ln St., Lombard, IL 60148.