1. Associate Professor, Dept. of Civil Engineering, Clemson Univ., Clemson, SC 29634-0911 (corresponding author).
2. Graduate Research Assistant, Dept. of Civil Engineering, Clemson Univ., Clemson, SC 29634-0911.
3. Project Geotechnical Engineer, Golder Associates Inc., Mt. Laurel, NJ 08054; formerly, Graduate Research Assistant, Dept. of Civil Engineering, Clemson Univ., Clemson, SC 29634-0911.