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By Lynn L. Bergeson and Carla N. Hutton
 
On December 21, 2020, the U.S. Environmental Protection Agency (EPA) announced that a report compiling the letter peer reviewers’ comments on the revised draft Toxic Substances Control Act (TSCA) risk evaluation of C.I. Pigment Violet 29 (PV29) is now available in Docket EPA-HQ-OPPT-2018-0604.  EPA states that it is in the process of reviewing the letter peer reviewers’ comments and will use the feedback received from the peer review and public comments to inform the final risk evaluation.
 
According to EPA, after it issued the draft risk evaluation in November 2018, it received additional data in response to test orders, as well as additional information voluntarily submitted by the sole U.S. manufacturer.  EPA states that these new data led it to revise its analytical approach for evaluating the potential exposure and health effects of PV29.  As a result of this updated analysis, the revised draft risk evaluation now shows unreasonable risk to workers for 11 out of 14 conditions of use.  Because these new data had a significant impact on EPA’s risk evaluation and ultimately the risk determinations, EPA provided an opportunity for the public to give input before issuing the final risk evaluation.
 
EPA notes that it also conducted a letter peer review of the revised draft risk evaluation using independent scientists, including one who has served as a member and several who have served as ad hoc peer reviewers for the TSCA Science Advisory Committee on Chemicals (SACC).  The peer review focused on charge questions supplied by EPA.  The report made available December 21, 2020, is the result of this letter peer review.


 

By Lynn L. Bergeson and Margaret R. Graham

On May 25, 2018, the U.S. Environmental Protection Agency (EPA) announced it would host a half-day preparatory meeting for experts selected to serve as letter peer reviewers for EPA’s Exposure and Use Assessment and Human Health and Environmental Hazard Summary for Five Persistent, Bioaccumulative, and Toxic (PBT) chemicals.  Section 6(h) of the Toxic Substances Control Act (TSCA) directs EPA to issue regulations under Section 6(a) for certain PBT chemical substances that were identified in EPA’s TSCA Work Plan for Chemical Assessments: 2014 update.  The selected chemicals are:

  • Decabromodiphenyl ethers (DECA);
  • Hexachlorobutadiene (HCBD);
  • Pentachlorothiophenol (PCTP);
  • Phenol, isopropylated, phosphate (3:1) (PIP3/ITPP); and
  • 2,4,6-Tris(tert-butyl) phenol (2, 4, 6 TRIS).

EPA prepared an Exposure and Use Assessment and a Human Health and Environmental Hazard Summary in response to the requirements under TSCA Section 6(h) to summarize conclusions of toxicity and whether there is likely exposure to these PBT chemicals and EPA organized letter peer reviews for the Exposure and Use Assessment and the Human Health and Environmental Hazard Summary.  The Federal Register notice announcing the meeting states that during the preparatory meeting, “the individual letter peer reviewers will have the opportunity to comment on and ask questions regarding the scope and clarity of the draft charge questions.”  EPA’s background papers, related supporting materials, and charge/questions for these letter peer reviews are now available in Docket No. EPA-HQ-OPPT-2018-0314 on www.regulations.gov

The meeting is scheduled for June 25, 2018, from 1:00 p.m. to 5:00 p.m. (EDT) and will be held via teleconference and webcast only.  Registration is available online.  Those requesting to provide oral comments (approximately five minutes) are asked to register by June 21, 2018.  Though the peer reviewers may not be able to consider fully written comments submitted after July 23, 2018, EPA will consider all comments submitted on or before August 17, 2018

More information, including the list of experts, is available on EPA’s TSCA Peer Review website.