1. Postdoctoral Fellow, Dept. of Environmental Engineering Sciences, Univ. of Florida, P.O. Box 116450, Gainesville, FL 32611-6450; and Assistant Professor, Dept. of Environmental Health, East Tennessee State Univ., 65 Lamb Hall, P.O. Box 70682, Johnson City, TN 37614.
2. Graduate Research Assistant, Dept. of Environmental Engineering Sciences, Univ. of Florida, P.O. Box 116450, Gainesville, FL 32611-6450.
3. Professor, Dept. of Environmental Engineering Sciences, Univ. of Florida, P.O. Box 116450, Gainesville, FL 32611-6450 (corresponding author).
4. Professor and Associate Dean for Research, Dept. of Civil, Architectural, and Environmental Engineering, Univ. of Miami, Coral Gables, FL 33124-0630.