NYC 9/11 Public Portal Document
OSHA SAMPLING RESULTS SUMMARY AS OF 3/11/02
Asbestos: A total of 1136 samples (excluding bulk and blank samples) for asbestos have
been taken. From 9/13 -9/21,177 samples were taken in the financial district.
Since 9/21, sampling focused on the debris field and those workers working in
or immediately next to it 144 of the samples analyzed exceeded OSHA’s
limit via PCM analysis. However, upon further analysis using discriminating
counting methods and/or TEM analysis, the number of asbestos fibers foimd
dropped dramatically to below detectable levels or well below .1 f/cc.
Carbon Monoxide: A total of 103 personal samples of workers on the rubble pile showed results
ranging fi'om 1 ppm to 34 ppm which are well below the OSHA permissible
exposure limit of 50 PPM.
Noise: OSHA is monitoring the noise exposures of employees who perform (or work
near) noisy operations such as jack hammering and drilling. To date the 131
samples collected indicate that employee noise exposures range from 73.7
dBA to 110.7 dBA. Twenty sample have exceeded the applicable permissible
exposure limit of 90 dBA, mostly for concrete drilling, cutting, and jack
hammering operations. Accordingly, OSHA continues to recommend the use
of appropriate hearing protection in noisy operations, and specifically, for
concrete drilling, cutting, and jack-hammering operations OSHA recommends
dual hearing protection i.e. plugs and ear muff protection.
TotaiDust(PNOR) A total of 150 samples (excluding bulk and blank samples) for total dust in and
around the debris field were taken. 5 samples were found to be in excess of
the PEL for Total dust (15mg/m3). The highest exposure was found on one
operator who was exposed at approximately 4X PEL.
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