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Remedial Investigation Report Operable Unit 5 Libby Asbestos …
----- 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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Radiographic Evidence of Nonoccupational Asbestos Exposure …
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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EPA to change removal criteria | Western News
A trait of Libby Amphibole Asbestos is concentrations of potassium and sodium, unique to the Rainy Creek Vermiculite Mountain deposit because of its alkaline origin. "These studies were conducted using new methodology that is from 100 to 1,000 times more sensitive than conventional methods that have been used to measure for asbestos in soils ...
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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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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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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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About EPA's Draft Site-wide Human Health Risk Assessment Libby Asbestos
This means that EPA's cleanup work results in acceptable risk levels. EPA has extensively tested outdoor air in Libby and Troy for LA asbestos and concentrations are now equivalent to those found in other Montana cities. Air asbestos concentrations today are up to 100,000 TIMES LOWER than when the mine and processing facilities were operating.
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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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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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- 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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Mortality from asbestos-associated disease in Libby, Montana …
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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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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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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Libby Amphibole Asbestos – Not Just a Libby Risk
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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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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-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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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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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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EPA to change removal criteria | Western News
"The average concentration of Libby Amphibole Asbestos on background is about 500,000 structures per gram of soil," Dr. Berry said. "That sounds like a lot of fibers, but that …
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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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Persistent effects of Libby amphibole and amosite asbestos …
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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Asbestos Exposure and Health Screening in Libby, Montana: …
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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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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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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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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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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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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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. 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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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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Asbestos Exposure and Health Screening in Libby, Montana: …
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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