1. K.F. Hasselmann Chair in Geological Engineering, Dept. of Geological Sciences & Engineering, 125 McNutt Hall, Missouri Univ. of Science & Technology, Rolla, MO 65409 (corresponding author).
2. President, Soil Testing Engineers, Inc., 316 Highlandia Dr., Baton Rouge, LA 70810.
3. Professor and Chair, Dept. of Geosciences, Mississippi State Univ., Mississippi State, MS 39762.
4. Graduate Research Assistant, Dept of Geological Sciences & Engineering, 129 McNutt Hall, Missouri Univ. of Science & Technology, Rolla, MO 65409.