1. Professor of Civil and Environmental Engineering, Univ. of Illinois, 205 N. Mathews Ave., Urbana, IL 61801 (corresponding author).
2. Environmental Specialist, Division of Emergency and Remedial Response, Ohio Environmental Protection Agency, Columbus, OH.
3. Sanitarian Program Specialist, Childhood Lead Poisoning Prevention Program, Ohio Dept. of Health, Columbus, OH.
4. Civil Engineer, California Environmental Protection Agency, Sacramento, CA.
5. Environmental Supervisor, Division of Emergency and Remedial Response, Ohio Environmental Protection Agency, Columbus, OH.