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INSTITUT DE L' AMIANTE/DIVI5I0N DE LA RECHERCHE
OCCUPATIONAL ASBESTOS EXPOSURE DATA WHEN PULLING OUT ASBESTOS ROOFING FELT
JACQUES LEBEL TECHNICAL DIRECTOR RESEARCH DIVISION
SHERBROOKE, JANUARY 22, 1985
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OCCUPATIONAL ASBESTOS EXPOSURE DATA WHEN PULLING OUT ASBESTOS ROOFING FELT
I- ABSTRACT
Airborne asbestos fibers concentrations were measured when pulling out the asbestos roofing felt on January 16, 1985 from the gymnasium of the Carver George Washington Senior High School New Orleans, Louisiana, United States. Six personal breathing zone samples and one area sample were collected and counted for asbestos fibers by means of optical phase contrast microscopy (OPCM) according to NZOSB method 7400 (1). Our results indicate that concentrations of asbestos fiber longer than five micrometers (pm) are below the analytical limits of detection of the phase contrast microscopy method.
II- SAMPLING AND ANALYSIS
II-l
Two series of three personal breathing zone samples were collected to check the personal exposure of workers when pulling out the asbestos roofing felt.
The ambient air concentration of asbestos fibers was measured downwind of the construction site with one area sample to follow the level of asbestos fibers which may result of this demolishment.
II-2
Each sample was counted with optical phase contrast microscopy (OPCM) for fibers longer than 5 pm by the Asbestos Institute, Research Division.
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REFERENCES
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(1) NIOSH Method 7400 (1984) Find copy of the revised NIOSH fiber count method. National Institute for Occupational Safety and Health, issued on 02/15/84.
(2) Si&niatycki, J. (1982) "Health Effects on the General Population (Mortality in the General Population in Asbestos Mining Area)" in. Proceedings of the World Symposium on Asbestos, Montreal Quebec: 25-27 May 1982, p. 337.
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PULLING OUT ASBESTOS ROOFINC FELT
PULLING OUT ASBESTOS ROOFING FELT PULLING OUT ASBESTOS ROOFING FELT PULLING OUT ASBESTOS ROOFING FELT
PULLING OUT ASBESTOS ROOFING FELT PULLING OUT ASBESTOS ROOFING FELT PULLING OUT ASBESTOS ROOFING | FELT PULLING OUT ASBESTOS ROOFING FELT
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THE ASBESTOS INSTITUTE
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Sherbrooke, January 30, 1985
Hr. Zacharia Ellis ELLIS Z. ROOFING CO INC 2201 Richland Avenue Kenner NEW ORLEANS LOUISIANA, U.S.A.
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Dear Hr. Ellis:
You will ind enclosed Che results of our sampling co measure che asbestos emission during che rip-out of che asbestos roofing felt from che gymnasium of the Carver George Washington Senior High School New Orleans. It Is of interest to recall chat no occupational health hazards may be attributed to airborne asbestos fibers in che course of this roofing's demolishmenc because the concentrations of asbestos fiber are below che limit of applicability of che NIOSK method 7400. The mean results (<0.02) are sore chan a hundred time lower chan the OSHA PEL of 2.0 fibers longer than 5 micrometers per milliter of air.
Thank you once again for your hospitality and heir you gave me wnen I visited vou on 16 through 18th January 1985.
Best personal regards,
Jacques LeBel Technical Direccor Research Division JL/ld Enclosure c.c. Jacques Dunnigan, PhD
Kenneth E. Nyquise Robert C. McAdam
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