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Task Force Human Health Risk Assessment
This report was prepared by Environ International Corporation after dioxin was found in DuPont's Sierra-Crete® product, which was used to pave about 36 miles of roads in East Contra
Costa County between 1988 and 1997.
The report is lengthy and has been broken up into segments for easier download. All pages are in Adobe Acrobat (PDF) format.
- I - Introduction & Overview (573k PDF, 15pp.)
- II - Exposures to Current & Future Residents (547k PDF, 17pp.)
- III - Exposures to Current & Future Children (542k PDF, 16pp.)
- IV - Exposures to Current & Future Road Workers (556k PDF, 18pp.)
- V - Exposures to Current & Future Residents During Road Maintenance (559k PDF, 19pp.)
- VI - Exposures to Past Road Construction Workers (569k PDF, 21pp.)
- VII - Exposures to Past Trespassers at Former Road Construction Sites (531k PDF, 20pp.)
- VIII - Environmental Evaluation (581k PDF, 17pp.)
- IX - Supporting Technical Information (738k PDF, 63pp.)
- X - Appendices (487k PDF, 9pp.)
- Appendix A - Sampling & Analysis Plan (1,048k PDF, 60pp.)
- Appendix B - Road Surface Sampling (243k PDF, 19pp.)
- Appendix B, attachment A - Chain-of-Custody (2,001k PDF, 21pp.)
- Appendix B, attachment B - Photos (3,895k PDF, 187pp.)
- Appendix B, figures - (7,679k PDF, 28pp.)
- Appendix C - Testing Results (88k PDF, 6pp.)
- Appendix D - Road Surface Spreadsheet (150k PDF, 15pp.)
- Appendix E - Road Repair Spreadsheet (199k PDF, 31pp.)
- Appendix F - Road Contruction Spreadsheet (434k PDF, 83pp.)
- Appendix G - Dioxin Fact Sheet (91k PDF, 6pp.)
Other links
DuPont's page on Sierra-Crete®
For more information contact Hazardous Materials Ombudsman Michael
Kent at 925-313-6587
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