EPA releases draft estimates of asbestos toxicity in Libby and …

These efforts have achieved significant reductions in air concentrations of asbestos fibers in Libby. Those levels are 10,000 times lower since the company left the community. The Libby Asbestos site includes portions of the towns of Libby and Troy and an inactive vermiculite mine seven miles northeast of the town of Libby. Vermiculite had been ...

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Natural Mineral Fibers: Conducting Inhalation Toxicology Studies …

A growing body of evidence further suggested that human exposure to Libby amphibole asbestos increased risk of lung cancer, mesothelioma, and non-malignant respiratory disease in both occupational and non-occupational ... Generating and delivering a stable asbestos aerosol concentration to a nose-only exposure system was a challenge, due to the ...

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Site‐wide Human Health Risk Assessment

The vermiculite mine near Libby began limited operations in the 1920s and was operated on a larger scale by the W.R. Grace Company (Grace) from approximately 1963 to 1990. Vermiculite from the mine contains varying concentrations of amphibole asbestos, referred to as "Libby amphibole asbestos" or LA.

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- FINAL

The vermiculite mine near Libby began limited operations in the 1920s and was operated on a larger scale by the W.R. Grace Company (Grace) from approximately 1963 to 1990. Operations at the mine included mining and milling of the vermiculite ore. Vermiculite from the mine near Libby contains varying concentrations of asbestos. The vermiculite

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GAO-03-469 Hazardous Materials: EPA's Cleanup of …

concentrations of asbestos—was mined at Libby between 1923 and 1990, and accounted for most of the world's vermiculite. Mining, processing, or any disturbance of the contaminated vermiculite releases asbestos fibers into the air, which can lead to respiratory illnesses, including asbestosis. When processed, the vermiculite is

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Summary of Published Measurements of Asbestos Levels in …

These data provide a perspective on "background" levels of asbestos in air, and may help with risk management decision-making at the site. 2.® Strategy for Locating Information on Airborne Concentrations of Asbestos Primary and secondary literature sources were screened for information on ambient concentrations of airborne asbestos in outdoor ...

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Asbestos Toxicity: Who Is at Risk of Exposure to Asbestos

On the other hand, asbestos contained in intact solid material poses a negligible risk of exposure. Air levels of asbestos in a building with asbestos embedded in building materials show an undisturbed average 0.0002 f/cc, nearly 3 orders of magnitude below OSHA's permissible exposure limit for occupational exposures [Holland and Smith 2003].

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Natural Mineral Fibers: Conducting Inhalation Toxicology Studies …

Specifically, Libby amphibole asbestos 2007 (referred to as LA 2007, bulk materials, ), a test material representing the air from the vermiculite mine near Libby, ... Concentrations determined gravimetrically were compared to the mean concentrations determined by the RAM during the time period of the filter sample collection. The RAM ...

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1948: What the Government Knew about Libby, Montana

As stated in the book, "Extensive studies on concentration, processing, and utilization are being continued." (p 26, see below) I am new to the story about the devastation caused to Libby by vermiculite and tremolite asbestos, but it seems that as of 1948, Montana recognized that the vermiculite was a potentially strong industry. It would ...

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Libby Asbestos Response Plan

The purpose of the Libby Asbestos Public Information Plan is to plan for a unified source of public information during a wildfire within the area impacted from asbestos contamination near the …

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CHEMICAL-SPECIFIC HEALTH CONSULTATION: TREMOLITE ASBESTOS …

The U.S. Department of Health and Human Services (DHHS) is addressing public health concerns regarding a fibrous amphibole that occurs in vermiculite ore in the Libby, Montana, area. Scientists agree that exposure to this mineral increased the risk of nonmalignant respiratory and pleural disorders, lung cancer, and mesothelioma in groups of people who worked in the now …

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Libby Amphibole Asbestos – Not Just a Libby Risk

At peak output, the WR Grace vermiculite mine located in Libby was producing 80% of the world's vermiculite. Vermiculite contaminated with Libby Amphibole asbestos was shipped to nearly …

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Libby Amphibole Asbestos Plain Language Frequent Questions

For the IRIS assessment of Libby Amphibole asbestos (LAA), EPA developed an RfC value that can be used to inform future risk management decisions in the Libby, Montana region and …

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Study of Asbestos Contamination of Former Vermiculite …

The total concentration of asbestos fibers detected in duplicate samples taken during disturbance of Soil 12 was 1.526 f/cc and 2.186 f/cc. Analysis of air samples taken during disturbance of Soils 5, 6, 7, and 11 revealed lower numbers of asbestos fibers. Total concentration of asbestos fibers detected in duplicate samples taken during ...

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LIBBY ASBESTOS SITE RESIDENTIAL/COMMERCIAL …

Libby asbestos (LA) is a form of amphibole asbestos unique to the Libby vermiculite deposit and is fundamentally different from more commonly found chrysotile asbestos.

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Libby: the long legacy of a public health disaster

The EPA evaluated more than 150 different activities and collected more than 5000 activity-based air samples throughout Libby to understand what the asbestos exposures could be. Top soil with an asbestos concentration of 1% or greater was removed down to a level of 1 m; soil with concentrations as low as 0·2% was removed to a depth of 0·5 m.

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Operable Units 4 and 7 Final Institutional Control …

Rfc reference concentration . RI remedial investigation . ROD record of decision . ROW right-of-way . s/cm. 2 structures per square centimeter . Site Libby Asbestos Superfund Site ... Bill 30 revised the Libby asbestos superfund laws to create the Libby Asbestos Superfu nd Oversight Committee (LASOC). The LASOC was created to enhance ...

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-FINAL- Data Summary Report: 2011 Residential Activity …

3.1.4 Calculation of Air Concentration ... The Libby Asbestos Superfund Site (Site) was listed on the U.S. Environmental Protection Agency (EPA) National Priorities List in October 2002. 1.2 Document Purpose As determined by previous investigations …

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Libby Asbestos Superfund Site Draft Site-wide Cumulative …

Libby Amphibole Asbestos Outdoor Air Concentrations - Then and Now iber/cc) ... Title: Libby Asbestos Superfund Site Draft Site-wide Cumulative Human Health Risk Assessment (HHRA) Public Meeting Presentation given by Dr. Deborah McKean Author: NONE, / EPA Subject: Region ID: 08 DocID: 1272475; DocDate: 12-08-2014

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FINAL SUMMARY OF OUTDOOR AMBIENT AIR …

FOR ASBESTOS AT THE LIBBY ASBESTOS SITE LIBBY, MONTANA (October 2006 to June 2008) Prepared by US Environmental Protection Agency Region 8 Denver, CO ... C Concentration of asbestos in air (structures per cc of air) CTE Central Tendency Exposure DQA Data Quality Assessment

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Libby Asbestos

At least 1 in 10 people in Libby currently have an asbestos-related illness, according to the Center for Asbestos Related Disease in Libby. In addition to the hundreds of residents who have died, …

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Final Remedial Investigation Report Operable Unit 8 Local and …

Lockheed Martin, 2011. Trip Report Libby Asbestos Site, Libby, MT, Work Assignment No.: SERAS-084 - Lockheed Martin Scientific, Engineering, Response and Analytical Services. ... 3.5 Estimating Confidence Bounds For an Individual Sample The uncertainty around a TEM estimate of asbestos concentration in a sample is a function of the number of ...

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GAO-03-469, Hazardous Materials: EPA's Cleanup of Asbestos in Libby

Vermiculite ore—containing high concentrations of asbestos—was mined at Libby between 1923 and 1990, and accounted for most of the world's vermiculite. Mining, processing, or any disturbance of the contaminated vermiculite releases asbestos fibers into the air, which can lead to respiratory illnesses, including asbestosis.

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Is Libby air safe to breathe?

The concentration levels do not appear to be substantially different from location to location within the city limits. The report says the levels of Libby amphibole asbestos in Libby's air are similar to levels of asbestos observed in outdoor air in other locations. The …

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Persistent effects of Libby amphibole and amosite asbestos …

Background: Human exposure to Libby amphibole (LA) asbestos increases risk of lung cancer, mesothelioma, and ... injury, and cell proliferation. Short-term results guided concentration levels for a stop-exposure study in which rats were exposed to …

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Asbestos: mining exposure, health effects and policy implications

However, since asbestos is only dangerous when inhaled, subsurface deposits pose little risk. When these deposits are mined, airborne concentrations increase greatly In Libby, Montana, mining and processing of asbestos-contaminated talc and vermiculite increased airborne asbestos concentrations from <0.004 in 1847 to 0.022 fibres/cm 3 in 1995

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Vermiculite, Respiratory Disease, and Asbestos Exposure in Libby

The raw Libby ore was estimated to be 21–26% asbestos by weight; the mill feed was 3.5–6.4% asbestos; airborne dust in the dry mill was 40% asbestos ; and the vermiculite concentrate shipped to numerous processing plants in the United States and other countries was 0.3–7.0% asbestos before expansion (Amandus et al. 1987; Atkinson et al ...

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SUMMARY OF OUTDOOR AMBIENT AIR MONITORING …

FOR ASBESTOS AT THE LIBBY ASBESTOS SITE LIBBY, MONTANA (October 2006 to June 2008) Prepared by US Environmental Protection Agency Region 8 Denver, CO ... C Concentration of asbestos in air (structures per cc of air) CTE Central Tendency Exposure DQA Data Quality Assessment

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Vermiculite and Libby

Also, attic insulation contaminated with Libby asbestos may still be in schools, businesses and as many as 35 million homes around the United States alone. The EPA Responds. The vermiculite mining operation was finally closed in 1990. In 1999, the EPA sent an Emergency Response Team to Libby as a response to local health concerns and related ...

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EPA'S ONLY PUBLIC HEALTH EMERGENCY: LIBBY, MONTANA'S ASBESTOS …

METHODS: Community-wide asbestos exposures caused by mining activities took place in Libby, Mont. from 1919 until 1990. Once respiratory health effects were identified, environmental and healthcare responses were initiated by the federal government. The Center for Asbestos Related Disease (CARD) was started in Libby as a result of the sudden recognition of this public health …

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