The guidance supplements existing 6/19/1987 guidance for de minimis waste contributor settlements and establishes the minimum level of information necessary before a Region can consider a de minimis settlement, as well as provides a methodology to construct payment matrices in appropriate circumstances, and encourages Regions to take a more active role in facilitating de minimis settlement. This memorandum expands upon the information provided in the "Superfund Administrative Improvements-Final Report," dated June 23, 1993. OSWER Directive No. 9834.7-1D. Issued 7/30/1993.