1. Graduate Research Assistant, Environmental Research Center, 201 Butler Carlton Hall, Missouri S&T, Rolla, MO 65409.
2. Research Chemist, Dept. of Chemistry and Environmental Research Center, 201 Butler Carlton Hall, Missouri S&T, Rolla, MO 65409.
3. Chemical Monitoring Coordinator, Missouri Dept. of Natural Resources, P.O. Box 176, Jefferson City, MO 65102.
4. Chair and Professor, Dept. of Civil, Environmental, and Architectural Engineering, Univ. of Kansas, 2150 Learned Hall, Lawrence, KS 66045 (corresponding author).