1. Retired, Assistant Director of Monitoring and Research, Metropolitan Water Reclamation District of Greater Chicago, 1834 Arrowhead Trl, Allegan, MI 49010 (corresponding author).
2. Adjunct Professor, Dept. of Civil, Architectural, and Environmental Engineering & Chemistry, Illinois Institute of Technology, 3201 South Dearborn, Chicago, IL 60616.
3. Associate Teaching Professor, Dept. of Chemical and Biological Engineering, Illinois Institute of Technology, 10 West 33rd St., Chicago, IL 60616.