Guidance to the Regions for conducting complex potentially responsible party (PRP) searches for the Superfund remedial program and preparing PRP search reports. Initially issued as a supplement to the PRP Search Manual. OSWER Directive No. 9834.3-2a. Issued 6/16/1989. Transmittal memorandum issued 6/29/1989.You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.