1. Department of Civil and Architectural Engineering, University of Wyoming, Dept. 3295, 1000 E. University Ave., Laramie, WY 82071-2000, USA
2. Coffey Engineering, 902 S 3rd St, Laramie, WY 82070, USA
3. Department of Statistics, University of Wyoming, P.O. Box 3332, Laramie, WY 82071-3295, USA