1. PhD, Assistant Professor, Dept. of Civil & Environmental Engineering, Tulane Univ., New Orleans, LA 70118 (corresponding author). E-mail: gboyd@tulane.edu
2. Graduate Student, Dept. of Civil & Environmental Engineering, Tulane Univ., New Orleans, LA 70118.
3. President, Sandvig Consulting, 525 Belair, Custer, SD 57730.
4. Principal, Economic & Engineering Services Inc., 10900 NE 4th St., Ste. 1110, Bellevue, WA 98004.