1. Assistant Professor, Dept. of Civil and Environmental Engineering, Lehigh Univ., Bethlehem, PA 18015.
2. Graduate Research Assistant, Dept. of Civil and Environmental Engineering, Lehigh Univ., Bethlehem, PA 18015.
3. Environmental Technician, Dept. of Civil and Environmental Engineering, Lehigh Univ., Bethlehem, PA 18015.
4. Professor, Dept. of Civil and Environmental Engineering, Howard Univ., Washington, DC 20007.