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The EPA on Wednesday, Aug. 19, 2009, announced it is seeking
comments on additional approaches to analyzing data related to the agency's
perchlorate regulatory determination. These additional comments are sought in
an effort to ensure consideration of all the potential options for evaluating
whether there is a meaningful opportunity for human health risk reduction of
perchlorate through a national primary drinking water rule, the agency said in
a notice in the Federal Register
In issuing this supplemental notice, the EPA is not making a final regulatory determination for perchlorate, nor is the agency changing the Interim Health Advisory Level of 15 μg/L, set in January 2009.
In an October 2008 notice in the Federal Register, the EPA referred to a draft report entitled Inhibition of the Sodium-Iodide Symporter by Perchlorate: An Evaluation of Lifestage Sensitivity Using Physiologically-Based Pharmacokinetic (PBPK) Modeling (USEPA, 2008b). This draft report was peer reviewed during the comment period on the regulatory determination. The report (USEPA, 2008c) and a summary of significant comments made by the external peer reviewers and the EPA's responses (USEPA, 2008e) can be found at http://cfpub.epa.gov/ncea/cfm/recordisplay.cfm?deid=212508. The peer review comments were complimentary and supportive of the EPA's modeling analysis and support document.
The agency did not get similar support from the public.
The agency noted it received 32,795 comment letters, of which 31,632 (96 percnet) were from seven different apparent mass mailing letter writing campaigns by groups that did not support the preliminary determination.
Of the remaining 1,163 comment letters that would be considered "unique,'' the agency said that 30 commenters provided EPA with detailed comments. Of those 30 comment letters, six supported the preliminary determination. These comments and other docket materials are available electronically at http://www.regulations.gov (Docket ID No. EPA-HQ-OW-2008-0692).
Comments must be received on or before Sept. 18, 2009.
In issuing this supplemental notice, the EPA is not making a final regulatory determination for perchlorate, nor is the agency changing the Interim Health Advisory Level of 15 μg/L, set in January 2009.
In an October 2008 notice in the Federal Register, the EPA referred to a draft report entitled Inhibition of the Sodium-Iodide Symporter by Perchlorate: An Evaluation of Lifestage Sensitivity Using Physiologically-Based Pharmacokinetic (PBPK) Modeling (USEPA, 2008b). This draft report was peer reviewed during the comment period on the regulatory determination. The report (USEPA, 2008c) and a summary of significant comments made by the external peer reviewers and the EPA's responses (USEPA, 2008e) can be found at http://cfpub.epa.gov/ncea/cfm/recordisplay.cfm?deid=212508. The peer review comments were complimentary and supportive of the EPA's modeling analysis and support document.
The agency did not get similar support from the public.
The agency noted it received 32,795 comment letters, of which 31,632 (96 percnet) were from seven different apparent mass mailing letter writing campaigns by groups that did not support the preliminary determination.
Of the remaining 1,163 comment letters that would be considered "unique,'' the agency said that 30 commenters provided EPA with detailed comments. Of those 30 comment letters, six supported the preliminary determination. These comments and other docket materials are available electronically at http://www.regulations.gov (Docket ID No. EPA-HQ-OW-2008-0692).
Comments must be received on or before Sept. 18, 2009.
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