Document vVRYVje2zpaXQaLmEb0yJdBO9
FILE NAME Roofing ROOF DATE 1984 Aug 7
DOC ROOF001
DOCUMENT DESCRIPTION J. Lebel Preliminary Report Occupational Exposure to Fibrous Asbestos Dust on Roof Layers
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POWER MARKETINMARGKETING MARKETING GROUPGROUP
OPTS
3 62036 Asbestos
Docket 11 M
File
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OCCUPATIONAL EXPOSURE TO FIEROUS DUST ASBESTOS
OF LAYERS WHEN HANDLING ASBESTOS ROOFING FELT
JACQUES LEBEL
TECHNICAL DIRECTOR
AUGUST 7 1984
LAYERS WHEN
I- ABSTRACT
Workplace concentration of
layers using asbestos
roof roofing felts were Leasured on August 2nd and 3rd
when building
1983 the roof of a new extension at one of the plant of the company
Canada Cascades Inc. at Kingsey Qu^'bec
Nine personal
breathing zone samples and two area samples were collected and
analyzed for asbestos by means of optical phase contrast
microscopy OPCM according to NIOSH P & CAM 239 1
Our results indicate that concentrations of asbestos
than five Cetection
micrometers km are of the phase contrast
below the analytical microscopy Further
fibre longerlonger limits of
observations
of the last and more representative membrane filter samples are
presently carried on with the analytical transmission electron
Licroscopy TEM
II SAMPLING AND ANALYSIS
II
The two first sets of three personal breathing zone samples were collected to check independently the handling of the two following asbestos felts during construction work
i Centurian Asbestos Base Felt
The ambient air concentration of
surrounding was memeaasursed ured
two area samples
upwind of
asbestos fibres in the the construction site with
The third and last set of three personal breathing zone samples were collected when handling both previous asbestos felts to have longer sampling time as needed to increase the analytical limit of detection of the membrane filter method
II
A first portion of each sample
with optical phase
contrast microscopy OPCM for
longer thant 5 pm by
the Institut de recherche et de d^'veloppement sur l'omiante
The
second remaining parts of the four last
samples have been sent to the School of Occupational
collected Health
of McGil McGil McGiMllcGill University
microscopy microscopy microscmicoropscoypy microscopy TEM will will will will be prepared
analysis
for direct
electron
microscope
observations
accordingacording acording according according to the method of Middleton and Jackson 2
The
transmissiontransmision trtransmisioan nsmission electron microscope analysis will be performed
asbestos at
at a magnification of 20,000 X for
fibres and asbestos fibres
total fibres longer than 5
total total pm per
litre of air
Each asbestos dust encountered will be
characterized with Energy dispersive analysis of rays
III- RESULTS
No asbestos fibres could be detected
breathing zone air samples as reported
on any of the personal
in the TABLE
Consequently Consequently the asbestos fibres appeared to be well locked in to
prevent any measurable airborne asbestos exposure under the
conditions of this survey when handling the Kingsey Centurian Asbestos Base Felt and the Kingsey No. 15 Asbestos Finishing Felt
IV- CONCLUSION
IV
The concentrations of asbestos fibre being below the analytical limits of detection of the phase contrast microscopy method no health hazard to asbestos is existing for layers when handling Kingsey asbestos rocfing felts during construction work
.
Further observations with the analytical
transmision
electron microscopywill be pursued on few representative
representative
samples to detect short asbestos fibres and for fibre
identification in cases of mixed airborne fibre to which
workers may be exposed as recommended by the NIOSH Asbestos Work Group 3 who also recognized that the membrane filter optical phase contrast microscopy was the only technique available for routine monitoring of occupational exposures
TABLE
SAMPLE NUMBER
SAMPLE ASBESTOS FELT FILTER FLOW- SAMPLING
TYPE
USED
TYPE
\
RATE
PERIOD
METEOR
OBSERV
03-08-84 ,
i
|
Area
Centurian and Milliporefi 2
finishing 37 mm Q
No. 15
15-14 Sunny Temp
Wind N.W.
Cascades 03-08-84
.
Personal Centurian
|
1 Cascades 03-08-84 Centurian
|
Cascades 03-08-84 | Personal Centurian
Millipore 2
37 mm 0
40-11 Sunny Temp Wind N.W.
Millipore 2 | 40-11 Sunny Temp i
37 rum Q
Wind N.W.
Millipor 2
37 mm 9
40-11 Sunny Temp
Wind N.W.
Cascades 03-08-84 | Personal ' Finishing
:
i
No. 15
03-08-84
:
.
Cascades 03-08-84
Personal Finishing
No. 15
} Personal Finishing
|
No. 15
Millipore 2
37 mm 0 |
Millipore 2
37 mun b
Millipore 2
37 mm Q
Cascades 04-08-84
:
Area Centurian and Millipore 2 | finishing 37 mm b
No. 15
Sunny Temp
Wind N.W.
07-14 Sunny Temp Wind N.W.
07-14 Sunny Temp
Wind N.W.
Sunny Temp
Wind N.W.
- 04-08-84
:
Centurian and Millipore 2
finishing
37 mm 0
No. 15
27-14 Sunny Temp
Wind N.W.
Cascades 04-08-84 | Centurian and Millipore
finishing 37 mm Q
|
No. 15
2 | 27-14 Sunny Temp
Wind N.W.
Cascades | Centurian and Millipore 2
finishing 37 mm Q
No. 15
j
27-14 Sunny Temp Wind N.W.
1 N.D Non detectable - below detection limit The analytical limit of detec limit
o
and
and 0.01 for 4 to 5 samples
1 NIOSH P & CAM 239 1977 Asbestos Fibres in Air National Institute for Occupational Safety and Health Analytical Method issued 03/30/77
2 Middleton A.P. and Jackson E.A. 1982 A procedure for the estimation of asbestos collected on membrane filters using transmission electron microscopy TEM The Annals of Occupational Hygiene 1982 25 pp 381-391
3
NIOSH Asbestos Work Group 1980 Workplace exposure to asbestos Review and recommendations Submitted on April 1980 to the Assistant Secretary for Occupational Safety and Health and the Director National Institute for Occupational Safety and Health