The Comprehensive Environmental Response, Compensation and Liability Act of 1980 (42 USC 9601 et. seq.) is known as the Superfund Law or "CERCLA." It makes all past and present owners of a polluted plot of land liable for the clean-up costs.
The EPA has a Superfund Hotline that provides information and publications on all things related to the Superfund program (800-424-9346).
The Superfund section of the EPA web site includes superfund-related publications and let s you look up hazardous waste sites, both classified and proposed. For more about hazardous waste sites, see the National Priority List section.
The Enforcement and Compliance Assurance section of the EPA web site provides information about liability, negotiations, and settlements under CERCLA (Superfund), RCRA Corrective Action, OPA, and UST. More RCRA materials are available from RCRA Online.
Agreements: The main EPA guidance on Prospective Purchaser Agreements (as of 8/28/97) is published at 60 Fed. Reg. 34792. To get other/more recent guidance, check the Web, search the Federal Register or call the Superfund hotline.
PRPs: You can order a CD-ROM with the "responsible parties at Superfund sites that have received Special or General Notice letters from EPA," but in the past I have used Westlaw (EDR-NPLPRP) to get lists of Potentially Responsible Parties (PRPs). NOTE 1: The lists can be long, so you might want to print out just the first few pages describing the site and the page with the PRP you care about. NOTE 2: Lexis has a PRP database (ENVIRON;PRP), but it covered only 1998-2001 the last time I checked. NOTE 3: The Westlaw lists may not be comprehensive; I found the pre-2001 lists on Lexis sometimes have more PRPs than the lists on Westlaw.