1. Ph.D. Student, Dept. of Civil and Environmental Engineering, Michigan State Univ., 1542 Linden St., East Lansing, MI 48823.
2. Professor, Dept. of Civil and Environmental Engineering, Michigan State Univ., 3546 Engineering Building, East Lansing, MI 48824-1226.
3. Senior Scientist, Metna Co., 1926 Turner St., Lansing, MI 48906.
4. Project Manager, Stantec Consulting Services, Inc., 500 Main St., Baton Rouge, LA 70801 (corresponding author).