develop consensus standards for use by TNI's programs. This group has a support role in assisting other programs with activities such as guidance and standards interpretation.
fosters the generation of data of known and documented quality is through the National Environmental Laboratory Accreditation Program, or NELAP. The purpose of this program is to establish and implement a program for the accreditation of environmental laboratories.
is to establish and maintain a national PT program to support TNI’s National Environmental Laboratory Accreditation Program, and other activities.
Field Activities Program (NEFAP) Executive Committee is to establish and implement an accreditation program for field sampling and measurement organizations (FSMOs).
Audit Sample Program is to develop consensus standards for the manufacture and analysis of audit samples for source emission testing.
on a variety of topics of interest to the environmental measurement community. TNI also hosts two regularly scheduled meetings per year, typically in January and August. Both are a week long and involve open meetings of TNI committees as well as training courses and other special sessions.Request for Comments on the Draft Standard EL-V4; General Requirements for an Accreditation Body of Environmental Proficiency Test Providers
Date Posted: 6-23-2025
The TNI Proficiency Testing Expert Committee is providing for your review and comment the following documents:
- A Draft Standard for EL-V4-2025-Rev.3.0 has been prepared in response to comments received and in support of Accreditors of Proficiency Test Providers (PTP). (click here to view PDF)
- This revision of EL-V4 reflects a total rewrite of the standard consistent with ISO 17011. Justification for the changes presented in the DS for EL-V4-2025-Rev. 3.0 is provided on the required Justification form. (click here to view PDF)
- The comment period will be open for ninety (90) calendar days, in accordance with Consensus Standards Development SOP 2-100 Rev 4.3, located at https://nelac-institute.org/docs/sop-policy/SOP-2-100-Rev4.3-CSDP-StdDev-240312FINAL.pdf.
The NELAP Accreditation Council may request a thirty (30) day extension of this comment period. Please send your comments and any proposed revised text to both Carol Gebhart, The Proficiency Testing Expert Committee Chair, ([email protected]) and Robert Wyeth, the Program Administrator for the Proficiency Testing Expert Committee ([email protected]). All comments will be tracked by the PA, and you will be notified of the committee's response to your comment after all comments are considered and addressed if deemed persuasive.
You are invited to provide comments on the revised EL-V4. We do ask that you provide alternative wording that would address your concern whenever possible. As with prior revisions of TNI standards, all comments will be ruled either persuasive, non-persuasive, or editorial by the committee, and addressed accordingly. If substantive/controversial and persuasive comments are received, a revised Draft Standard will be re-presented for public comment.