1. Associate Engineer, CH2M HILL, Inc., 325 East Hillcrest Dr., Suite 125, Thousand Oaks, CA 91360 (corresponding author).
2. Professor, Dept. of Civil, Structural and Environmental Engineering, State Univ. of New York at Buffalo, 207 Jarvis Hall, Buffalo, NY 14260.
3. Project Scientist, CH2M HILL, Inc., 1000 Wilshire Blvd., 21st Floor, Los Angeles, CA 90017.