1. Professor, Dept. of Civil and Environmental Engineering, Northwestern Univ., Evanston, IL 60208 (corresponding author).
2. Research Assistant, Dept. of Civil and Environmental Engineering, Northwestern Univ., Evanston, IL 60208; Staff Engineer, Terracon Consultants, Inc., 11555 Clay Rd., Houston, TX 77043.
3. Division Manager, Hayward Baker, Inc., 1350 W. Lake St., Roselle, IL 60172.
4. Field Engineer, Hayward Baker, Inc., 1350 W. Lake St., Roselle, IL 60172; formerly, Research Assistant, Northwestern Univ., Evanston, IL 60208; Staff Engineer, GeoEngineers, Inc., 4000 Kruse Way Pl Bldg. 3, Suite 200, Lake Oswego, OR 97035.