How does this decision impact clean up of perchlorate at Superfund sites?
At the time of publication of the Interim Health Advisory for perchlorate, the Agency withdrew the January 26, 2006, guidance it issued regarding perchlorate and sites addressed under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) and the National Oil and Hazardous Substances Contingency Plan (National Contingency Plan or NCP). The January 2006 guidance recommended that Regions consider using a preliminary remediation goal (PRG) of 24.5 ppb (or g/L). In its place, the Agency recommends that Regions consider using the Interim Health Advisory level of 15 g/L as a PRG; consistent with the NCP, the Agency often considers health advisories as to be considered (TBC) values for setting cleanup levels. Also, where state regulations establish applicable or relevant and appropriate requirements (ARARs) for perchlorate, these standards should be used as the cleanup level at Superfund sites, unless the ARAR is waived at the site.
