1. Assistant Professor, Environmental Engineering Science Program, Washington Univ. in St. Louis, One Brookings Dr., St. Louis, MO 63130.
2. Project Engineer, Black and Veatch, 8400 Ward Pkwy., Kansas City, MO 64114.
3. Assistant Professor, Dept. of Civil and Construction Engineering, Iowa State Univ., Town Engineering Hall, Ames, IA 50011.