1. 1960 East Alameda Drive, Tempe, AZ 85282 (480) 921-0887 E-mail: cjbruce@usa.net
2. Arizona State University, Department of Civil and Environmental Engineering, Tempe, AZ 85287-5306, USA (480) 965-8130 E-mail: p.westerhoff@asu.edu
3. City of Phoenix Water Services Department, 23rd Avenue Water Treatment Plant, Phoenix, Arizona (602) 534-6113 E-mail: abrawley@ci.phoenix.az.us