ENVIRONMENTAL PROTECTION AGENCY v. BOARD OF TRUSTEES, MURDALE WATER DISTRICT, an Illinois public corporation, DR. C. NORMAN GEYER, EDWARD D. BERNHARDT, RICHARD L. PETERMAN, RICHARD BRECT, MAX L. WEBEL, GORDON ISCO, MRS. KENNETH SERFASS, WILLIAM CORACY, JAMES WATKINS, JAMES CARLOCK, ROBIN MARCH, EDMUND KUNCE, RICHARD RICHMAN, CHARLES GARRISON, CHARLES WOEFEL, JERRY KENNEDY, and WILLIAM R. HAMILTON, as individuals.