IRIS Toxicological Review of Libby Amphibole Asbestos (Interagency Science Consultation Draft)
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Abstract
This draft health assessment of the toxicity of Libby amphibole asbestos was prepared by staff in both EPA’s Region 8 Office and ORD/NCEA. The assessment is focused on a specific type of asbestos found as a consequence of the mining and processing of vermiculite in Libby, Montana. The assessment will be included on EPA's IRIS data base when finalized. The project supports OSWER and Region 8 site clean-up and related risk management initiatives at the Libby Superfund site. As with all IRIS assessments, the development of this external peer review draft document required internal EPA review and OMB/interagency review. After an independent external peer review, the draft final document will undergo a second round of EPA and OMB/interagency review before being finalized and then included on the IRIS data base.
Libby Amphibole asbestos is a complex mixture of amphibole fibers, both mineralogically and morphologically. The mixture primarily includes tremolite, winchite, and richterite fibers with trace amounts of magnesioriebeckite, edenite, and magnesio-arfvedsonite. These fibers exhibit a range of morphologies (e.g. prismatic, ascicular, asbestiform)(Meeker et al., 2003).
Impact/Purpose
Status
Citation
History/Chronology
Date | Description |
---|---|
Aug 2007 | The Libby Amphibole Asbestos assessment was initiated in 2007. It was nominated for assessment by the IRIS Program because it supports OSWER and Region 8 site clean-up and related risk management initiatives at this Superfund site. An assessment for Libby Amphibole Asbestos is not currently on IRIS. |
May 2011 | EPA hosted an interagency science consultation on the draft IRIS Toxicological Review of Libby Amphibole Asbestos. |
Aug 2011 | EPA released the External Review Draft for public review and comment, and announced the public listening session would be held on October 6, 2011. [Federal Register Notice Aug 25, 2011] |
This download(s) is distributed solely for the purpose of pre-dissemination peer review under applicable information quality guidelines. It has not been formally disseminated by EPA. It does not represent and should not be construed to represent any Agency determination or policy.
- IRIS Toxicological Review of Libby Amphibole Asbestos (Interagency Science Consultation Draft) (PDF) (483 pp, 5 MB, about PDF)
- Charge to External Peer Reviewers (PDF) (5 pp, 90 KB, about PDF)
- EPA's response and comments from the Interagency Science Consultation Meeting (PDF) (93 pp, 2 MB, about PDF)