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Airborne Asbestos Fiber Exposure Assessment of
Heavy Equipment Mechanics
- P0110 -
American Industrial Hygiene 65th Annual Conference and Exposition
May 2005, Anaheim, California
F.W. Boelter, CIH, PE C.E. Simmons, CIH
J.W. Spencer, CIH, CSP
Boelter & Vates, Inc. Park Ridge, IL
Assessment Strategy
Personal and area air samples Heavy equipment repair facility Period of nine days Removal and replacement activities Asbestos-containing friction products and gaskets Four different pieces of heavy equipment Four mechanics
Analytical Methods
Cleanliness - AHERA Federal Register Vo!. 52, No. 210 PCM - NIOSH Method 7400 for phase contrast microscopy TEM - NIOSH Method 7402 transmission electron microscopy PLM - EPA/600/R-93-116 (7/93 Edition) ACH - ASTM Method E 741-00 Standard Test Methodfor
Determining Air Change in a Single Zone ry Means ofa Tracer Gas
Dilution Smoke, Fume and Particulate - ARTI HHPC-6 and TSI P-Trak CO, CO2, Temp, RH - Q-Trak Model 8554
Results
Full-shift personal samples
0.005 to 0.049 fl cc by peM 0.002 to 0.041 asbestos fl cc TEM
STEL personal samples
0.043 to 0.56 fl cc by both peM and TEM
95% confidence that:
95% of 8-hour TWA exposures <0.061 f/cc by peM and
<0.057 asbestos fl cc by TEM 95% of STEL exposures <0.19 fl cc by peM and <0.13
asbestos fl cc by TEM
Location B
CJ omCD I
Locatio~ Bay 1
OVDrflaad door
Assessment Conditions
Worst case maintenance scenarios Very low ventilation rates (0.13 ACH with all
doors and windows closed and 1 to 5 ACH with doors open). Multiple machines simultaneously Focus was working on these machines (limited distractions) Old vintage machines
Summary of Air Sampling Results (Entire Study)
All results are well below respective PEL Average 8-hr TWA = 0.014 asbestos flcc (0.1 PEL) Average 30-min EL = 0.060 asbestos flcc (1.0 PEL) Average of area samples is 0.008 asbestos fl cc
D Personal- PCM Personal- TEM
Comparing Results
- Auto Mechanics -
Study consistent with published literature
Numerous studies of auto mechanics performing brake work
Historic studies (1968-1996) all show exposures below respective PEL
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All Data i - - ; [1968~1996J '
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Roberts and
Zumwalde (1982)
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[1979]
R6delsperger et aL (1986)
Platoetai. (1995) [ 1976-1988J
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Conclusions
Repair and maintenance of asbestos-containing friction products and gaskets in heavy equipment results in exposures well below both OSHA's standard for an 8-hour TWA and the 30-minute EL
Aggressive activities such as scraping, hammering, drilling, abrasive cutting, riveting, and cleaning using a die grinder or compressed air on materials containing asbestos did not yield significant concentrations based on a STEL nor contribute meaningfully to the 8-hr TWA
Airborne Asbestos Fiber Exposure Assessment of Heavy
Equipment Mechanics
Fred w. Boelter, CIH, PE
Catherine E. Simmons, CIH Boelter & Yates, Inc. Park Ridge, Illinois 847/692-4700
fboelter - boelter-. ates.com
csimmons@boelter-yates.com