By Lynn L. Bergeson and Carla N. Hutton

The U.S. Environmental Protection Agency (EPA) announced on March 23, 2023, that it is seeking public nominations of scientific and technical experts that EPA can consider for service as ad hoc reviewers assisting the Science Advisory Committee on Chemicals (SACC) with the peer review of the “2023 Draft Supplement to the 1,4-Dioxane Risk Evaluation.” 88 Fed. Reg. 17566. EPA states that it will release the draft supplement for public review and comment in June 2023. EPA also plans to submit the draft supplement to the SACC for peer review and is scheduling a four-day virtual public meeting for the SACC to consider and review the draft supplement in September 2023. Nominations are due April 24, 2023.
 
According to EPA, the focus of the four-day virtual public meeting is the SACC peer review of the methodologies that have not been previously peer reviewed and are used in the 2023 1,4-dioxane supplemental risk evaluation. EPA will consider feedback from this review in the development of the final supplement to the 1,4-dioxane risk evaluation. EPA notes that in addition, SACC reviewer feedback may help refine EPA’s methods for conducting release assessments and evaluating general population exposures in risk evaluations of other chemicals under the Toxic Substances Control Act (TSCA).
 
EPA intends to publish a separate document in the Federal Register to announce the availability of and solicit public comment on the draft supplement, at which time EPA will provide instructions for submitting written comments and registering to provide oral comments at the peer review meeting planned for September 2023. EPA also intends to provide a meeting agenda for each day of the meeting, and as needed, may provide updated times for each day in the meeting agenda that will be posted in the docket and on the SACC website.
 
SACC serves as a scientific peer review mechanism of EPA’s Office of Chemical Safety and Pollution Prevention (OCSPP). It provides independent scientific advice and recommendations to EPA on the scientific basis for risk assessments, methodologies, pollution prevention measures, and approaches for chemicals regulated under TSCA.

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By Lynn L. Bergeson and Carla N. Hutton
 
On March 8, 2023, the U.S. Environmental Protection Agency opened a 30-day comment period on nominations for candidates to serve on the Toxic Substances Control Act (TSCA) Science Advisory Committee on Chemicals (SACC). According to EPA, there are currently 17 SACC members, with eight membership terms that will soon expire. Biographies for all candidates under consideration are available online. In addition, biographies for current SACC members are available on the SACC website. Comments on the nominations are due April 7, 2023. EPA states that it will use comments received to assist it in selecting new members of the SACC by June 2023.
 
SACC serves as a scientific peer review mechanism of EPA’s Office of Chemical Safety and Pollution Prevention (OCSPP). SACC provides independent scientific advice and recommendations to EPA on the scientific basis for risk assessments, methodologies, and pollution prevention measures and approaches for chemicals regulated under TSCA.

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By Lynn L. Bergeson and Carla N. Hutton
 
The U.S. Environmental Protection Agency (EPA) announced on December 21, 2022, that it seeks public nominations of scientific and technical experts whom EPA can consider for service as ad hoc reviewers assisting the Science Advisory Committee on Chemicals (SACC) with the peer review of two draft documents entitled “Draft Proposed Principles of Cumulative Risk Assessment Under the Toxic Substances Control Act” and “Draft Proposed Approach for Cumulative Risk Assessment of High-Priority Phthalates and a Manufacturer Requested Phthalate Under the Toxic Substance Control Act.” 87 Fed. Reg. 78103. EPA states that it will submit the two draft documents to SACC and release them for public review and comment in late February 2023. EPA will solicit comments from SACC on issues related to chemical grouping for purposes of cumulative risk assessment (CRA), health outcomes related to phthalate syndrome, and possible approaches to developing the cumulative hazard and exposure assessment for high-priority phthalates and a manufacturer-requested phthalate. EPA also announced the scheduling of a four-day virtual public meeting for SACC to consider and review the two draft documents. EPA provides the following chronological listing of the dates for the specific activities:

• January 20, 2023 -- Deadline for submitting all nominations to EPA;
   
• April 24, 2023 -- Deadline for submitting a request for special accommodations to allow EPA time to process the request before the meeting; and
   
• May 8 to 11, 2023, from 10:00 a.m. to approximately 5:30 p.m. (EDT) -- The public virtual meeting will be held via a webcast platform such as “Zoom.gov” and audio teleconference, and you must register to receive the links.

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By Lynn L. Bergeson and Carla N. Hutton
 
The U.S. Environmental Protection Agency (EPA) announced on November 10, 2022, that it is requesting nominations of prospective candidates for membership on the Science Advisory Committee on Chemicals (SACC) established under the Toxic Substances Control Act (TSCA). 87 Fed. Reg. 67898. Any interested person or organization may nominate qualified persons to be considered for appointment to the SACC. Individuals may also self-nominate. Nominations are due December 12, 2022.
 
SACC serves as a scientific peer review mechanism of EPA’s Office of Chemical Safety and Pollution Prevention (OCSPP). According to EPA, SACC provides independent scientific advice and recommendations to EPA on the scientific basis for risk assessments, methodologies, and pollution prevention measures and approaches for chemicals regulated under TSCA. Currently, there are 17 SACC members, with eight membership terms that will expire over the next year.
 
EPA states that its “rigorous scientific peer review processes ensure all Agency decisions are founded on credible science and data. Science provides the foundation for EPA policies, actions and decisions made on behalf of the American people.”
 
To be considered, all nominations should include the following information:

• Current contact information for the nominee (including the nominee’s name, organization, current business address, e-mail address, and daytime telephone number);
   
• The nominee’s disciplinary and specific areas of expertise;
   
• Research activities;
   
• Recent service on other federal advisory committees and national or international professional organizations; and
   
• When available, a biographical sketch of the nominee, indicating current position and educational background.

EPA states that it is seeking nominations from individuals who have demonstrated high levels of competence, knowledge, and expertise in scientific and other technical fields relevant to chemical safety and risk assessment. EPA seeks nominees with expertise in a variety of disciplines and focus areas, including human health and ecological risk assessment, biostatistics, epidemiology, pediatrics, physiologically based pharmacokinetics (PBPK), toxicology and pathology (including neurotoxicology, developmental/reproductive toxicology, and carcinogenesis), and chemical exposure pathways to susceptible life stages and subpopulations (women, children, and other potentially exposed subpopulations).
 
EPA states that nominees should have backgrounds and experiences that would contribute to the diversity of scientific viewpoints on the committee -- including professional experiences in government, labor, public health, public interest, animal protection, industry, and other groups -- and as the EPA Administrator determines to be advisable (e.g., geographical location; social and cultural backgrounds; and professional affiliations).

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By Lynn L. Bergeson and Carla N. Hutton
 
The U.S. Environmental Protection Agency (EPA) announced on July 21, 2022, that the meeting minutes and final report (final report) are now available for the April 19-21, 2022, Science Advisory Committee on Chemicals (SACC) virtual meeting regarding EPA’s proposed Draft Systematic Review Protocol Supporting TSCA Risk Evaluations for Chemical Substances Version 1.0 (Draft Protocol). As reported in our December 21, 2021, memorandum, EPA released the Draft Protocol for public comment on December 20, 2021. 86 Fed. Reg. 71891. According to EPA’s December 20, 2021, press release, the Draft Protocol will strengthen EPA’s approach to reviewing and selecting the scientific studies that are used to inform Toxic Substances Control Act (TSCA) chemical risk evaluations and ensure that EPA has the best tools under TSCA to protect human health and the environment. EPA intends to issue its response to the SACC’s recommendations along with any revisions to the approach in 2023.

Charge Question 1: TSCA Systematic Review Protocol Document (Chapters 1-7)

The final report states that the SACC raised some substantive comments that require edits or explanation from EPA. According to the SACC, the Draft Protocol “is closer to a framework to carry out systematic review and other evaluation processes for TSCA risk evaluation.” Multiple SACC members recommended specifying systematic review and non-systematic review processes (e.g., risk assessment) within the Draft Protocol. To increase transparency, the Draft Protocol needs to: (1) start with the problem formulation; (2) describe how Populations, Exposures, Comparators, and Outcomes (PECO) or Receptors, Exposure, Setting or Scenario, and Outcomes (RESO) statements are developed and refined through the process; (3) describe the process of systematic review, evidence synthesis, and integration; and (4) clearly link the steps of the systematic review back to the larger risk evaluation process.

Charge Question 2: Strategies for Literature Search and Screening (Chapter 4)

According to the final report, overall, the SACC found the methods for searching and screening well described in Chapter 4. The general process for searching the peer-reviewed literature was considered robust, but the SACC noted concerns that methods for searching gray literature were neither robust nor complete. The method for searching gray literature does not currently find relevant information from states, non-governmental organizations (NGO), or community groups. The SACC recommends EPA identify authoritative reviews from government agencies and begin with these as a starting point to make more efficient use of time and resources.

Charge Question 3: Method to Assess the Quality of Evidence (Chapter 5)

The final report states that in general, the SACC noted that the Draft Protocol is an improved approach compared with the 2018 method. There was greater transparency and clarity in the data evaluation methods, as EPA’s process for evaluating the data across various evidence streams was well described and explained. The SACC made several recommendations to include more detail regarding the role of certain evidence types, such as biochemical and cellular-level outcomes, and to describe how supplemental data sources will be reviewed, evaluated, and incorporated into the systematic review or what criteria will be used to make the determination to consider/incorporate these data. In addition, EPA should re-evaluate the domain “accessibility” and identify whether an alternative term or phrase would be more appropriate to capture the elements under consideration. The SACC stated that EPA should be specific about the types of quality and validity issues it is considering and maintain appropriate categorizations of each instead of referring to them collectively under a blanket term.

Charge Question 4: Approaches for Integrating Evidence in Exposure and Hazard (Chapter 7)

According to the final report, SACC agreed this is a difficult and multi-faceted task and generally found that several aspects of the chapter were helpful, such as the hierarchies of data and the documentation on integration. As written, the Draft Protocol presents a complicated and potentially inefficient method for integrating data within the various disciplines, however. The final report states that many SACC members were concerned that criteria used to judge quality may exclude useful data that are not of high quality but nevertheless may have specific value for other downstream applications (e.g., corroboration of results or to assist with coherence of a data stream). In addition, the evidence integration process inappropriately introduces criteria for data selection that should be specified earlier in the process.

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By Lynn L. Bergeson and Carla N. Hutton
 
The U.S. Environmental Protection Agency (EPA) announced on May 19, 2022, the availability of the meeting minutes and final report for the March 15-17, 2022, Science Advisory Committee on Chemicals (SACC) virtual meeting regarding EPA’s proposed Screening Level Approach for Assessing Ambient Air and Water Exposures to Fenceline Communities Version 1.0 under the Toxic Substances Control Act (TSCA). According to the meeting minutes and final report, SACC “agreed that the methodological document was well organized and generally well written.” SACC states that it “had difficulty reproducing results that were relevant to understanding and reviewing the document and indicated multiple limitations and uncertainties,” however. SACC suggested the methodology could only be used as part of a tiered approach to evaluate risk to fenceline communities and should not be used to evaluate risks in isolation. The screening level approach may be protective for the specific exposure pathways included, but it may not be protective overall because potential key exposure pathways are excluded and because it does not consider cumulative exposures, multiple source exposures, aggregate exposures, and double/aggregate and occupational exposures from workers living near and working at the facilities. Some SACC members also suggested that additional risk factors, such as stress, poverty, cultural practices, and diet, should be considered for a comprehensive assessment.
 
The meeting minutes and final report states that the accuracy and/or completeness of the data used to develop the screening analysis were not adequately supported in the document, and SACC decided it did not defensibly represent actual exposure of fenceline communities. Overall, SACC indicated the basis for several model inputs was insufficiently transparent and that, in particular, daily life activities of all communities disproportionately impacted by chemical exposures was missing in this current version. SACC recommended the term “fenceline” be refined to include the characteristics, behaviors, and realities of communities exposed through means that are not dependent on being within a limited radius from a chemical facility. SACC agreed that Version 1 of the screening tool for fenceline communities “is currently not adequate for evaluating potential exposures relevant to tribes, indigenous populations, subsistence lifestyles, cultural practices, or other unique circumstances. The pathways by which people in unique communities are exposed to chemicals of the contaminated areas are much broader than those represented in the current defining criteria of ‘Fenceline Communities.’” To make the tool applicable for any unique community, the meeting minutes and final report state that additional exposure scenarios and relevant data must be applied.
 
SACC recommended that knowledgeable community representatives “be intrinsically involved for perspective on how such information is applied in a screening endeavor, as well as the relevance and pedigree of values used to inform exposure algorithms, and relevance of default data and assumptions.” Complementary to this process is the need for enhanced and meaningful outreach to “fenceline communities” and all parties interested in these screens. SACC offered specific commentary and suggestions, along with a collection of references. A meeting transcript is available.

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By Lynn L. Bergeson and Carla N. Hutton
 
On March 15-17, 2022, the U.S. Environmental Protection Agency (EPA) held a meeting of the Science Advisory Committee on Chemicals (SACC) to peer review EPA’s “Draft TSCA Screening Level Approach for Assessing Ambient Air and Water Exposures to Fenceline Communities Version 1.0” (screening methodology). As reported in our January 24, 2022, memorandum, EPA will use the screening methodology to evaluate potential chemical exposures and associated potential risks to fenceline communities in its Toxic Substances Control Act (TSCA) risk evaluations. EPA presented its screening methodology, as well as the results of applying the screening methodology to 1-brompropane (air pathway), n-methylpyrrolidone (water pathway), and methylene chloride (air and water pathway). EPA will use the scientific advice, information, and recommendations from SACC, as well as public comments, to inform the final protocol. EPA has posted the following materials:

• Biographical sketches of selected ad hoc reviewers;
• The draft screening methodology and supporting documents;
• Agenda and roster for the meeting;
• Meeting transcript;
• Recording of the March 15, 2022, meeting;
• Recording of the March 16, 2022, meeting; and
• Recording of the March 17, 2022, meeting.

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By Lynn L. Bergeson and Carla N. Hutton
 
The U.S. Environmental Protection Agency (EPA) announced on March 10, 2022, that registration is now open for the April 19-21, 2022, virtual meeting of the Science Advisory Committee on Chemicals (SACC). During the meeting, SACC will peer review the draft Toxic Substances Control Act (TSCA) Systematic Review Protocol. SACC’s virtual meeting is open to the public, and registration is required. EPA states that the draft Protocol, released in December 2021 for public comment, incorporates changes to address the recommendations from the National Academies of Sciences, Engineering, and Medicine (NASEM), as well as comments received from SACC and the public. According to EPA, the SACC review “will provide a transparent process to ensure that the protocol follows sound science and incorporates independent scientific advice and recommendations.” Stakeholders wishing to provide oral comments during the virtual meeting must register by 12:00 p.m. (EDT) on April 4, 2022. Stakeholders may register as listen-only attendees at any time until the end of the meeting on April 21, 2022. More information on the draft Protocol is available in our December 21, 2021, memorandum.

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By Lynn L. Bergeson and Carla N. Hutton
 
The U.S. Environmental Protection Agency (EPA) announced on February 7, 2022, that registration is now open for the March 15-17. 2022, meeting of the Science Advisory Committee on Chemicals (SACC) to peer review EPA’s “Draft TSCA Screening Level Approach for Assessing Ambient Air and Water Exposures to Fenceline Communities Version 1.0” (screening level methodology). As reported in our January 24, 2022, memorandum, EPA will use the screening level methodology to evaluate potential chemical exposures and associated potential risks to fenceline communities in its Toxic Substances Control Act (TSCA) risk evaluations. EPA has extended the comment period to March 22, 2022, to give stakeholders additional time to provide input. EPA “encourages” written comments for consideration by SACC during its peer review be submitted by the original deadline of February 22, 2022. EPA states that it will provide comments submitted after this date to the SACC members, but notes that members “may not have adequate time to consider those comments prior to the meeting’s discussions.” While SACC is unable to consider comments submitted after the March 15-17, 2022, meeting, EPA will consider all comments submitted by March 22, 2022.
 
To provide oral comments during the virtual peer review meeting, registration must be received by 12:00 p.m. (EST) on February 25, 2022. Stakeholders may register as a listen-only attendee at any time until the end of the meeting on March 17, 2022.

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By Lynn L. Bergeson and Carla N. Hutton

On January 21, 2022, the U.S. Environmental Protection Agency (EPA) announced that it will hold a virtual peer review meeting of the Science Advisory Committee on Chemicals (SACC) to consider and review the “Draft TSCA Screening Level Approach for Assessing Ambient Air and Water Exposures to Fenceline Communities Version 1.0.” 87 Fed. Reg. 3294. The meeting will be held March 15-17, 2022, and will be open to the public. Along with presenting the methodology, EPA will also present results of applying the screening methodology (case studies) to 1-bromopropane (1-BP) (air pathway), N-methylpyrrolidone (NMP) (water pathway), and methylene chloride (MC) (air and water pathway). In addition, EPA announced the availability of and solicited public comments on the draft approach, which will be presented as a screening level methodology for assessing potential air and water chemical exposures to fenceline communities. Comments are due February 22, 2022.

EPA's background documents, related supporting materials, and draft charge questions to the SACC are available in Docket ID EPA-HQ-OPPT-2021-0415 and on the SACC website. EPA will provide additional background documents (e.g., SACC members and consultants participating in this meeting and the meeting agenda) as the materials become available. Registration is required to receive the webcast meeting link and audio teleconference information. EPA states that it intends to announce registration instructions on the SACC website by early February 2022.

More information and a detailed commentary will be available in a forthcoming memorandum that will be posted on our website.

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