1. Research Engineer, Dept. of Civil and Environmental Engineering, California Polytechnic State Univ., 1 Grand Ave., San Luis Obispo, CA 93407 (corresponding author). E-mail: iwoertz@calpoly.edu
2. Project Coordinator, LifeWater International, Inc., 3563 Empleo St., Suite C, San Luis Obispo, CA 93401.
3. Assistant Professor, Dept. of Civil and Environmental Engineering, California Polytechnic State Univ., 1 Grand Ave., San Luis Obispo, CA 93407.
4. Professor, Dept. of Civil and Environmental Engineering, California Polytechnic State Univ., 1 Grand Ave., San Luis Obispo, CA 93407.