1. Graduate Research Assistant, Dept. of Civil and Environmental Engineering, Univ. of Nevada, Las Vegas, 4505 Maryland Pkwy., Box 454015, Las Vegas, NV 89154-4015. E-mail: akalra@egr.unlv.edu
2. Associate Professor, Dept. of Civil and Environmental Engineering, Univ. of Nevada, Las Vegas, 4505 Maryland Pkwy., Box 454015, Las Vegas, NV 89154-4015. E-mail: piechota@ce.unlv.edu
3. Engineer, Brown and Caldwell, 4425 W. Spring Mountain Rd., Las Vegas, NV 89102. E-mail: whonnock@earthlink.net
4. Assistant Professor, Dept. of Civil and Architectural Engineering, Univ. of Wyoming, 1000 E. University Ave., Laramie, WY 82071-2000. E-mail: tootleg@uwyo.edu