1. Samuel S. Baxter Professor Emeritus, Dept. of Civil, Architectural and Environmental Engineering, Drexel Univ., 3141 Chestnut St., Philadelphia, PA 19104 (corresponding author).
2. Associate Professor, Dept. of Civil, Architectural and Environmental Engineering, Drexel Univ., 3141 Chestnut St., Philadelphia, PA 19104.
3. Geotechnical Engineer, Hardesty & Hanover, 850 Bear Tavern Rd., Suite 206, West Trenton, NJ 08628.