1. Assoc. Prof., Envir. Engrg. Dept., Manhattan Coll., 3825 Corlear Ave., Riverdale, NY 10471.
2. Assoc. Prof., Dept. of Civ. Engrg., Ctr. for Biofilm Engrg., 366 EPS Build., Montana State Univ., Bozeman, MT 59717.
3. Proj. Engr., Malcolm Pirnie, Inc., 102 Corporate Park Dr., Box 751, White Plains, NY 10602.
4. Sr. Proj. Engr., Hazen and Sawyer, P.A., 458 7th Ave., New York, NY 10018.
5. Proj. Engr., New York City Dept. of Envir. Protection, Bureau of Envir. Engrg., Corona, NY 11368.