The risk and magnitude of hazardous release into each of these three pathways is separately rated and then combined into an aggregate score; all sites receiving an HRS score of 28.50 or greater are listed on the NPL. See generally Bradley Mining Co. v. United States Environmental Protection Agency, 972 F.2d 1356, 1357-58 (D.C. Cir. 1992). The Agency first declared its intention to include petitioner Tex Tin's Texas City, Texas, smelting facility on the NPL in August 1990.