1. Professor, Dept. of Civil, Architectural, and Environmental Engineering, Environmental Research Center, 220 Butler Carlton Hall, Univ. of Missouri-Rolla, Rolla, MO 65409 (corresponding author).
2. Chemical Monitoring Coordinator, Missouri Dept. of Natural Resources, Jefferson City, MO 65102.
3. Dept. of Civil, Architectural, and Environmental Engineering, Environmental Research Center for Emerging Contaminants, Univ. of Missouri-Rolla, Rolla, MO 65409.
4. Formerly, Director, Public Drinking Water Program, Missouri Dept. of Natural Resources, Jefferson City, MO 65102.