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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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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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 (LA) is a form of amphibole asbestos unique to the Libby vermiculite deposit and is fundamentally different from more commonly found chrysotile asbestos. Chrysotile asbestos was used in commercial products for decades and is ... concentration of LA within them, but also the likelihood that these source materials may be disturbed.
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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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CLINICAL IMPLICATIONS: EPA has established a new reference concentration of asbestos specific to Libby which is significantly lower than other asbestos reference concentrations verifying the toxicity of the Libby fibers. Asbestos will remain after clean-up is complete, and local institutional controls to mitigate ongoing exposures are still being developed.
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Toxicological Review of Libby Amphibole asbestos (PDF) (685 pp, 8.5 ) Libby Amphibole asbestos IRIS Summary (PDF) (35 pp, 381 K) Fact sheet and frequent questions for the Libby Amphibole asbestos assessment: Science in Action: IRIS Final Assessment of Libby Amphibole asbestos (PDF) (1 pp, 276 K) Libby Amphibole asbestos Frequently Asked ...
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of exposures to Libby amphibole fibers specifically and asbestos exposure in general. Keywords amphibole, asbestos, Libby, respiratory diseases, vermiculite INTRODUCTION A vermiculite mine and mill located near Libby, Montana, operated from the early 1920s until 1990. Vermiculite is a naturally occurring laminar aluminum-iron-magnesium silicate ...
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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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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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routine and special activities in homes in and about Libby where asbestos-contaminated soil, dust or insulation might result in increased concentrations of asbestos fibers in air. 2. Collect air samples from a fixed air monitor in the main living area of homes where individuals engage in the routine or special activities referred to above. 3.
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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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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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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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The APS indicated a higher concentration of particles in the AM exposure compared with the same mass concentration of LA, but examination of all asbestos structures (any dimension ≥ 0.2 μm) with a scanning electron microscope (SEM) showed that the number concentrations for the AM and LA 3.3 mg/m 3 exposures were comparable (3101/cm 3 and ...
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estimate of the amount of Libby Amphibole asbestos that one can breathe every day for a lifetime that is likely to be without harmful health effects. This is known as an inhalation reference …
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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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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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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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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 Amphibole asbestos was transported across the nation to nearly 300 processing facilities. Vermiculite products were used in many public places such as parks, schools, sports fields, tracks, lawns and gardens. Occupational Exposure. Cleaning locations insulated with vermiculite;
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Environmental exposure to Libby asbestos and mesotheliomas. Am J Ind Med 2008; 51: 877–880. [Google Scholar] Peipins LA, Lewin M, Campolucci S, Lybarger JA, Miller A, Middleton D et al. Radiographic abnormalities and exposure to asbestos-contaminated vermiculite in the community of Libby, Montana, USA. Environ Health Perspect 2003; 111: 1753 ...
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Sampling and Analysis Plan/Quality Assurance Project Plan: 2012 Post-Construction Activity-Based Sampling Libby Asbestos Site, Operable Unit 2 Revision 0 - August 2012 Contract No. EP-S8-11-02 Task Order No. 00005 Prepared for: U.S. ENVIRONMENTAL PROTECTION AGENCY Region 8 Prepared by: ^K!th CDM Federal Programs Corporation 555 17th Street, Suite 1100 …
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assessment of Libby Amphibole Asbestos (dated August 2014) Date: August 13, 2014 ... reference concentration (RfC), including the choice of principal study and critical effect (localized pleural thickening), and use of uncertainty factors, seems appropriate. Likewise, the derivation of the inhalation unit risk
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CLINICAL IMPLICATIONS: EPA has established a new reference concentration of asbestos specific to Libby which is significantly lower than other asbestos reference concentrations …
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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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----- LIST OF FIGURES 1-1 OU Boundaries 1-2 Libby Groundwater Superfund Site 1-3 OU5 Land Uses and Building Locations 1-4 Building and Soil Abatement Response Actions 3-1 Surface Soil Sampling Locations 5-1 AB S Indoor Air Results 5-2 ABS Outdoor Air Results 5-3 LA in Indoor Dust 5-4 LA in Surface Soil - PLM Results 5-5 Visible Vermiculite in Surface Soils 5-6 LA and …
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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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Exposure Information Human exposure to Libby Amphibole asbestos is observed in the Libby, Montana region, at sites where the LAA contaminated vermiculite was processed, and at locations where it was used, including homes with insulation derived from Libby vermiculite. ... Montana region were exposed to high ambient air concentrations of LAA ...
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The estimated median asbestos concentrations in U.S. cities range from 10 –8 to 10 –4 f/cc . At 10 –4 ... The impact of Libby asbestos exposure on the health of employees of the Libby vermiculite mines and mills has been well documented.
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