Memorandum implements a recommendation of the 30-day study concerning accelerating potentially responsible party (PRP) remedial design starts under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA, commonly referred to as Superfund). OSWER Directive No. 9835.4-2b. Issued 4/2/1992.You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.