1. Civil Engineer, Geotechnical Engineering Section, American Electric Power Service Corporation, 1 Riverside Plaza Columbus, OH 43215-2373.
2. Hydrogeologist, Geotechnical Engineering Section, American Electric Power Service Corporation, 1 Riverside Plaza Columbus, OH 43215-2373.
3. Professor, Dept. of Civil and Environmental Engineering, Univ. of Illinois at Urbana-Champaign, 205 N. Mathews Ave., Urbana, IL 61801 (corresponding author).