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Sierra-CreteBackgroundIn May, 2002 the DuPont Corporation notified the County that a material called Sierra-Crete they produced locally contained dioxins. Dioxins are a class of chemicals that can cause a wide range of long-term health effects, including cancer. DuPont sold this material as a road base, and it was used on 36 miles of roads in east Contra Costa County. Some of the roads where the Sierra-Crete was used have developed cracks, leading to stain-like residues on the surface. Studies conducted on behalf of DuPont and the County have concluded that the health risks from the dioxins in the Sierra-Crete were not significant. The results of additional testing were completed in November and preliminary results of the updated health risk assessment were reviewed at the December 11 taskforce meeting. The results of the new testing were essentially the same as that initially conducted by DuPont. Sierra-Crete resources onlineRisk AssessmentRisk Assessment Workshop PresentationMinutes of the Sierra-Crete Task Force meetingsStreet Maps Showing Where Sierra-Crete Was UsedInformation About Dioxins
California Air Resources Board 1997
Facts about Chlorinated Dioxins And Dibenzofura (30k PDF) U.S. Department of Health and Human Services Agency for Toxic Substances and Disease Registry (ATSDR) Public Health Statement for Chlorinated Dibenzo-p-dioxins (CDDs) 1998 US Environmental Protection Agency Questions and Answers about Dioxins 2000 (150k PDF) World Health Organization Dioxins And Their Effects On Human Health 1999 California Office of Environmental Health Hazard Assessment Prioritization of Toxic Air Contaminants Children's Environmental Health Protection Act Report 2001 (125k PDF) United States General Accounting Office (GAO) Report Environmental Health Risks: Information on EPA's Draft Reassessment of Dioxins 2002 (165k raw text) 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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