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Great Lakes Binational Toxics Strategy
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Dioxin / Furans
Draft Report on PCDD (Dioxins) and PCDF (Furans) Sources and
Regulations
(May, 2000) and Addendum (August, 2000)
We are seeking comments on this draft report. Please address all comments to:
Mr. Nan Gowda
U.S. Environmental Protection Agency
77 West Jackson Blvd. (SRF-5J)
Chicago, Illinois 60604
Email: gowda.nanjunda@epa.gov
Thank you for your interest in the
Binational Toxics Strategy!
This document is available as a Portable
Document File ONLY!
(PDF 952Kb, 61pps)
Addendum
PCDD (Dioxins and PCDF (Furans): Sources and Regulations
August 18, 2000
The draft of the Great Lakes Binational Toxics Strategy (BTS) Dioxin Step 1&2 report, PCDD (Dioxins) and PCDF (Furans): Sources and Regulations, was finished and prepared for public review on May 26, 2000. In June, 2000, a public release of Dioxin Reassessment draft documents for external scientific review was provided on EPA's website (http://cfpub.epa.gov/ncea/cfm/recordisplay.cfm?deid=55264). The draft documents included revised inventory estimates and information related to estimates of dioxins and furans releases that is not included in, or is different from, that presented in the May 26, 2000 version of the BTS Dioxin Step 1&2 report. A preliminary review of the draft documents revealed several primary areas where new information relevant to the Step 1&2 report is provided in the June 2000 draft Dioxin Reassessment. These include:
- Additional toxic equivalency factor (TEF) schemes are defined and used to present results.
- A revised qualitative confidence rating scheme replaces the use of a numeric range of emissions to characterize uncertainty in the emission estimates.
- Additional detail is provided on congener profiles for certain sources.
- Additional discussion is added on the relationship of chlorine levels in the feed to dioxins/furans emissions for combustion sources.
- Updated release estimates are provided for certain sectors, including preliminary estimates of releases from urban runoff and rural soil erosion.
However, review of the draft documents released in June did not indicate any areas where the qualitative assessment of the relative magnitude of known dioxin sources presented in the May 26, 2000 report would be affected by the new information in the draft documents. The Great Lakes National Program Office (GLNPO) has chosen to release the May 26, 2000 version of the Dioxin Step 1&2 report without making revisions to reflect new information in the Dioxin Reassessment draft documents released in June for the following reasons:
- While there are many places where individual emission estimates change slightly, the overall qualitative assessment of the relative impact of different sources remains the same and conclusions related to reduction opportunities for the BTS would not be affected.
- The numbers and information contained in the June 2000 draft documents are only draft and are not to be cited nor referred to as EPA's final reassessment. Revising the report to reflect interim results that are not qualitatively different is not warranted, given that final reassessment inventory numbers should be available within a year.
- GLNPO is committed to providing the information on sources and regulations contained in the Dioxin Step 1&2 report to its stakeholders as quickly as possible.
Revisions to the report will be reconsidered upon release of the Final Dioxin Reassessment.