1. Associate Professor, Dept. of Civil and Environmental Engineering, Univ. of Cincinnati, Cincinnati, OH. 45221-0071 (corresponding author). E-mail: george.sorial@uc.edu
2. Senior Research Microbiologist, National Risk Management Research Laboratory, U.S. Environmental Protection Agency, 26 W. Martin Luther King Dr., Cincinnati OH 45268.
3. Research Associate, Dept. of Civil Environmental Engineering, Univ. of Cincinnati, Cincinnati, OH 45221-0071.
4. Research Associate, Dept. of Civil and Environmental Engineering, Univ. of Cincinnati, Cincinnati, OH 45221-0071.
5. President and Senior Statistician, Statking Consulting, Inc., Fairfield, OH 45014.