Risk assessment shows E.P.A. cleanup has reduced cancer and non-cancer risks in Libby and Troy
DENVER - The E.P.A. (EPA) announced the release of its final Integrated Risk Information System (IRIS) health assessment today for Libby Amphibole Asbestos (LAA). This assessment analyzes the potential cancer and non-cancer human health effects from inhalation exposure to LAA, and includes the final Toxicological Review of LAA. In addition, using the toxicity values as well as exposure data collected in Libby and Troy, Montana, E.P.A. has developed a outline site-wide Human Health Risk Assessment for the Libby, Montana Superfund site, which quantifies the risks of exposure to LAA for residents and workers.
"EPA's scientific evaluation shows that our cleanup approach is working and we are reducing health risks for residents in Libby," said Shaun McGrath, EPA's Regional Administrator. "We look forward to working with the community to use this important science in identifying the final set of cleanup actions."
The risk assessment shows that EPA's indoor and outdoor cleanups have been effective in reducing both the cancer and non-cancer risks in Libby and Troy. The asbestos air concentrations in Libby today are about 100,000 times lower than when mine and processing facilities were in operation, making the air quality in Libby similar to other Montana cities. The information will be used to identify how exposures can be reduced to protect human health now and in the future.
The IRIS health assessment includes an estimate of the amount of LAA that a person can breathe every day for a lifetime that is likely to not result in adverse non-cancer health effects. This is the 1st such estimate regarding non-cancer effects for any type of asbestos. The assessment also finds that LAA is carcinogenic to humans when inhaled and provides a quantitative estimate of cancer risk.
E.P.A. projects a broad discussion with the community over the next months on the risk assessment and options for cleanup and long-term management of the remedy. The agency expects to issue a project for cleanup of the location early next year that will be accessible for public review before a remedy is selected.
E.P.A. is hosting the following public sessions locally this week to present information and answer questions about the toxicity values and outline risk assessment:
Tuesday, Dec. 9, seven to nine p.m.; City of Libby Ponderosa Room; 952 E. Spruce Street, Libby, Mont.
Wednesday, Dec. 10, seven to nine p.m., Kootenai Senior Center, 304 3rd Street, Troy, Mont.
Thursday, Dec. 11, seven to nine p.m., City of Libby Ponderosa Room, 952 E. Spruce Street, Libby, Mont.
E.P.A. has been working in Libby since 1999. The Libby, Montana location was placed on the Superfund National Priorities List in 2002. In 2009, E.P.A. and the U.S. Department of Health and Human Services announced a public health emergency at the Superfund site. Removal actions have now been completed at in excess of 2,000 properties at the site, including the most contaminated areas. Studies show that those actions have reduced exposures and risks to residents.
EPA's IRIS plan evaluates information on health effects that may result from exposure to environmental contaminants. These high quality, science-based health assessments are used to inform decisions to protect human health. The IRIS database contains crucial information on chemical substances and their impacts on human health. Governments and private entities use data from IRIS in conjunction with exposure information to help characterize the public health risks of environmental contaminants. These characterizations are then considered in risk management decisions to protect human health.
To access the final toxicity assessment, outline risk assessment and other documents on EPA's Web site, visit:
http://www2.epa.gov/region8/libby-asbestos
For more information about the final IRIS assessment for Libby Amphibole Asbestos and for IRIS, visit:
http://www.epa.gov/iris
