1. Assistant Professor, Dept. of Civil and Environmental Engineering, Bucknell Univ., Lewisburg, PA 17837 (corresponding author).
2. Geotechnical Engineer, Gannett Fleming, Inc., Harrisburg, PA 17106-7100; formerly, Graduate Assistant, Dept. of Civil and Environmental Engineering, Bucknell Univ., Lewisburg, PA 17837.
3. Professor and Chair, Dept. of Civil and Environmental Engineering, Bucknell Univ., Lewisburg, PA 17837.