This discussion took place in Washington, D.C., July 19, 1990. The moderator was Robert H. Reinert, vice‐president, Malcolm Pirnie, 100 Eisenhower Dr., Paramus, NJ07652. Members of the panel were: Hope Babcock, general counsel, National Audubon Society, 801 Pennsylvania Ave. S.E., Suite 301, Washington, DC 20003; William B. Ellis, principal, vice‐president, and director, McSweeney, Burtch & Crump, 11 S. 12th St., Richmond. VA 23219; Robert E. Hall, intergovernmental affairs coordinator‐federal, Denver Water Department, 1600 W. 12th Ave., Denver, CO 80220; Wendell R. Inhoffer, general superintendent and chief engineer, Passaic Valley Water Commission, 1525 Main Ave., Clifton, NJ 07011; Kirk Stark, environmental scientist, elevated cases team, US Environmental Protection Agency, 401 M St. S. W., Washington, DC 20406; and John F. Studt, chief, regulatory branch, US Army Corps of Engineers, 20 Massachusetts Ave. N.W., Washington, DC 20314‐1000.