 Sites with Hazard Ranking System Package scores of 28.5 or higher out of 100 are placed on the NPL, pending official approval.The Potentially Responsible Party is an individual, corporation, or group that can be held financially responsible, at least in part, for the cleanup of the Superfund site.Recent court actions have resulted in the following companies being identified by the U.S. Environmental Protection Agency as Potentially Responsible Parties for the Kalamazoo River