| The purpose of this memorandum is to provide information concerning the status of the interim assessment guidance for perchlorate originally transmitted on June 18, 1999 (the '1999 Interim Guidance'). This memorandum was developed in response to requests from EPA Programs, Regions and individual states for a clarification concerning the Agency’s guidance in light of more recent assessment activities. As an interim measure and in the absence of a finalized oral health risk benchmark for perchlorate, EPA is reaffirming the 1999 interim guidance. The 1999 interim guidance may be replaced upon finalization of the 2002 Draft Assessment. |