1. Assistant Professor, Dept. of Civil Engineering, Univ. of Minnesota Duluth, 1405 University Dr., Duluth, MN 55812.
2. Associate Professor, Dept. of Civil and Environmental Engineering, Univ. of Pittsburgh, 705 Benedum Hall, Pittsburgh, PA 15261 (corresponding author).
3. Staff Engineer, Geosyntec Consultants, 337 Kenmont Ave., Pittsburgh, PA 15216.