NYC-WTC_000232933

NYC 9/11 Public Portal Document

OSHA SAMPLING RESULTS SUMMARY AS OF 4/09/02

Asbestos: A total of 1282 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. 146 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 found dropped dramatically to below detectable levels or well below . 1 f/cc.

Carbon Monoxide: A total of 115 personal samples of workers on the rubble pile showed results ranging from 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 156 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.

Total Dust (PNOR) A total of 152 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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NYC-WTC_000232933