1. Professor, Dept. of Civil and Environmental Engineering, 949 Benedum Hall, Univ. of Pittsburgh, Pittsburgh PA 15261 (corresponding author).
2. Geotechnical Specialist, American Geotechnical and Environmental Services, Inc., Canonsburg, PA 15317; formerly, Ph.D. Candidate, Dept. of Civil and Environmental Engineering, Univ. of Pittsburgh, Pittsburgh, PA 15261.
3. Graduate Student, Dept. of Civil and Environmental Engineering, Univ. of Pittsburgh, Pittsburgh, PA 15261.