The Terry Creek Dredge Spoil Areas/Hercules Outfall Site (Site) consists of a salt water tidal creek and marsh system located on the Atlantic coast directly east of the City of Brunswick in Glynn County, Georgia. The Site is located near the confluence of Terry Creek, Dupree Creek, and the Back River north of the Torras Causeway and east of U.S. Highway 17. The Site is located on the eastern side of the Brunswick peninsula. In general terms, the Site area is bounded to the north, south, and east by a tidal marsh which is periodically submerged, and on the west by an outfall ditch and the west bank of Dupree Creek. Due to the complexity and size of the Site, it is broken into three operable units (OUs) in accordance with the National Contingency Plan (NCP), 40 C.F.R. ? 300.430(a)(ii)(A). Operable Unit One (OU1), the subject of this action, is comprised of the above mentioned outfall ditch (Outfall Ditch) that was constructed as a conveyance system by Hercules Incorporated, now Hercules LLC (Hercules), in approximately 1911 and utilized by Hercules from 1948 until 1972 to discharge untreated wastewater containing toxaphene and from 1972 to 1980 to discharge pretreated wastewater from its pesticide plant located across U.S. Highway 17. OU1 is approximately 2.5 acres and located at approximate latitude 31.166083/longitude-81.472483. Between 1948 and 1980, Hercules produced toxaphene, a chlorinated agricultural pesticide, at its Brunswick Plant. Toxaphene was one of the most heavi