IN APPROXIMATELY JUNE OF 1998, RESPONDENT HALL-IRWIN OR ITS AGENTS OR CONTRACTORS DISCHARGED SIDECAST EARTHERN MATERIAL EXCAVATED FROM WETLAND AREAS AND INSTALLED A BENTONITE SLURRY WALL IN WETLANDS. ALTHOUGH RESPONDENT HALL-IRWIN REMOVED ILLEGALLY SIDECAST MATERIALS DISCHARGED IN THE WETLANDS, THE EXTENT AND IMPACTS OF ANY REMAINING DISCHARGES OF POLLUTANTS, INCLUDING BUT NOT LIMITED TO THE SLURRY WALL, REMAINS UNKNOWN.