NYC-WTC_000199666

NYC 9/11 Public Portal Document

OSHA SAMPLING RESULTS SUMMARY AS OF 11/17

Asbestos: A total o: viimiMIIIIgMI have been taken. WBIMMV 177 samples were taken in the financial district. They werCatB^uSaftll iS they walked within certain predetermined zones. Results revealed asbestos concentrations ranging from ND (none detected) to .037 f/cc., well below OSHA’s permissible exposure limit (PEL) of .1 f/cc.

and those workers working on or immediately next to it. „ L anarysfe "uslffgdiscrhiiiiidtnig"counthis mnlirwF"'andZdr TEM analysis, the number of asbestos fibers found dropped . dfematically to below detectable levels or well below . 1 f/cc. ,

Carbon Monoxide: A total of 47 personal samples of workers on the rubble pile showed results ranging from 1 ppm to 34 ppm which are well below the OSHA 50 ppm permissible exposure limit.

Noise: OSHA has been conducting noise monitoring in the rubble pile. Twelve personal samples have been conducted on employees performing (or working near) various operations such as jack hammering. Employee’s exposure to the noise range from 80.6 dBA to 89 dBA. OSHA’s permissible noise exposure for construction is 90 dBA

Respirable Silica: overwhelming —juSWlBiMI However, th^u iwm^fflaantateiTOTW only other exposures that appear to be over the PEL level were approximately twice the OSHA limit. These two exposures occurred during: 1) rubble removal and loading operations near the Winter Garden; and 2) during the breaking up of concrete in the pit. All of the work areas where apparent overexposures to silica occurred were in the rubble pile; an area where OSHA continues to encourage the use of respiratory protection.

Volatile Organic Compounds: OSHA has taken 431 samples for (VOCs) such as acetaldehyde, acrolein, acrylonitrile, benzene, 2-butanone, carbofurans, chlorodiphenyl (PCB), ethyl benzene, formaldehyde. Freon R-22 (chlorodiflouromethane), hexone, isocyanates (e.g. MDI, TDI), perchloroethylene, phosgene, styrene, toluene, 1-3 butadiene, trichloroethylene, vinyl chloride, and xylene. Screening samples initially showed elevated levels of some organic chemicals resulting from the fires burning in the rubble pile. Subsequent personal and area samples show worker exposure levels to be below OSHA limits. However, one personal sample result for benzene was found to be at the 8-hr. OSHA Allowable Limit concentration of 1 ppm. This was found on a backhoe operator moving debris.

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