leaking, or placing of any solid waste or hazardous waste into or on any land or water so that such solid waste or hazardous waste or any constituent thereof may enter the environment or be emitted into the air or discharged into any waters, including ground waters. 42 U.S.C. § 6903(3) (emphasis added). Under this definition, for the Partnership Defendants to be PRPs, there must have been a “discharge, deposit, injection, dumping, spilling, leaking, or placing” of contaminants on the property during their ownership. Id. Although we have previously concluded that RCRA’s defin 06, 722 (3d Cir.1996) (“[T]he passive spreading of contamination in a landfill does not constitute ‘disposal’ under CERCLA”), with Nurad, Inc. v. William E. Hooper & Sons Co., 966 F.2d 837, 846 (4th Cir.1992) (<HOLDING>). The first circuit court to face the question
holding that a municipal sewer system that leaked hazardous waste could rely on a thirdparty defense to avoid liability under cercla holding that prior owners are not liable for the gradual spread of contamination underground holding past owners liable for the disposal of hazardous wastes that leaked from an underground storage tank holding that a party that sold a product to another party arranged for disposal of a hazardous substance holding that the doctrine of strict liability applies where an owner of residential property brought a claim against the owners of a gasoline station immediately adjacent to a private residence after gasoline leaked into the property owners well