1. Professor, Dept. of Civil Engineering, Univ. of Illinois, 205 N. Mathews Ave., Urbana, IL 61801 (corresponding author).
2. Research Assistant, Dept. of Civil Engineering, Univ. of Illinois, 205 N. Mathews Ave., Urbana, IL 61801.
3. Project Engineer, Golder Associates, Inc., 230 Commerce, Suite 200, Irvine, CA 92602.
4. Attorney at Law, Bell, Rosenberg, and Hughes, 1300 Clay St., Suite 1000, Oakland, CA 94612.
5. Vice President, DCM/Joyal Engineering, 484 N. Wiget Lane, Walnut Creek, CA 94598.