1. Research Associate, Dept. of Civil and Environmental Engineering, Michigan State Univ., 3546 Engineering Building, East Lansing, MI 48824 (corresponding author).
2. Associate Professor, Michigan State Univ., East Lansing, MI 48824.
3. Professor, Michigan State Univ., East Lansing, MI 48824.
4. Senior Engineer, Soil and Material Engineers, Inc., The Kramer Bldg., 43980 Plymouth Oaks Blvd., MI 48170.