1. Member, ASCE
2. Res. Assoc., Dept. of Chem. and Envir. Engrg., Univ. of Arizona, Tucson, AZ 85721; currently, McLaren/Hart, Inc., Two North Shore Ctr., Ste. 100, Pittsburgh, PA 15212-5838.
3. Prof., Dept. of Civ. and Envir. Engrg., Penn. State Univ., University Park, PA 16802.