1. Bettie Margaret Smith Chair of Environmental Health Engineering, Dept. of Civil, Architectural, and Environmental Engineering, Univ. of Texas at Austin, TX 78712.
2. L.D. Betz Professor of Environmental Engineering, and Head of the Dept. of Civil, Architectural, and Environmental Engineering, Drexel Univ., Philadelphia, PA 19104.
3. Elizabeth Howell Stewart Professor of Civil and Environmental Engineering and Director of the Louisiana Water Resources Research Institute, Louisiana State Univ., Baton Rouge, LA 70803-6405.
4. Attorney, Pepper Hamilton, LLP, Washington, D.C.