NYC-WTC_000208440

NYC 9/11 Public Portal Document

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OSHA SAMPLING RESULTS SUMMARY AS OF 10/16/01

Asbestos A total of 478 air monitoring samples for asbestos have been taken. From 9/13 -9/22, 177 samples were taken in the fin^cial district They were taken on OSHA personnel as they walked within certain predetermined zones. Results revealed asbestos concentrations ranging from ND to .037 fr ee., well below OSHA’s permissible exposure limit (PEL) of, 1 free. After 9/22, sampling focused on the rubble pile (the keystone area of the map) where 32 of 210 saraplss exceeded OSHA’s limit via PCM analysis. However, upon tother 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 free. Sampling at Pier 25 where trucks carrying debris are being off loaded by crane to barge reveled no detectable asbestos

Carbon Monoxide: Thirty one personal samples for workers on the rubble pile showed results ranging from 1 ppm to 34 ppm well below the OSHA 50 ppm permissible exposure limit

Noise; OSHA has been conducting noise monitoring in the rubble pile (the keystone area of the map). Three personal samples have been conducted on employees perfonaing (or working near) various operations such as jack hammering. Employee’s exposure to noise ranged from 88 dBA to 89 dBA. OSHA’s permissible noise exposure limit for construction is 90 dBA. Silica: As of October 16“, the overwhelming majority of the 159 silica samples show no detectable levels of airborae silica. 'Rie highest sample result was approximately twice the OSHA limit, whereas the next highest level was less than half of this limit. Both of these levels were found on personnel working in the rubble pile, an anta where OSHA continues to encourage the use of respiratory protection Volatile Organic Conipounds; As of October 16*, OSHA has taken 120 samples for volatile organic compounds (VOCs) such as acetaldehyde, acrylonitrile, acrolcia, benzene, 2-butacoae, chlorodiphcnyl (PCB), dioxin, ethyl benzene, foimaldehyde, hexone, isocyanates, perchloroethylene, styrene, toluene, trichloroethylene, vinyl chloride and Jtylene. Screening samples initially showed elevated levels of some organic chemicals resulting from the fires burning in the nibble pile. Subsequent personal samples at breathing zone level and area samples show worker exposure levels to be below OSHA limits. However, one personal sample result for benzene was fotmd at the 8hr OSHA allowable limit concentration of Ippm. This exposure was found on a backhoe operator moving debris on the pile.

Metals: OSHA has taken 218 air samples to monitor worker exposures to dusts, fumes, oxides, and other compounds of metais such as antimony, beryllium, chromium, cobalt, copper, iron, lead, manganese, molybdenum, nickel, vanadium, zinc, cadmium, magnesium, arsenic, and mercury, Results from these samples arc generally well below the applicable OSHA limits. However, torch cutting and burning structural steel at the pile have resulted in instances of over-exposure as follows; copper (6); iron oxide (6); iead(l); and cadmium (3). Accordingly, OSHA is recommending that workers engaged in these operations continue to wear appropriate respiratory protection.

Other Analysis: OSHA has sampled for dioxin, isocyanates, pclynuclcited aromatics and oxides of nitrogen. Analysis is pending.

CITY_21MC100_002971277

NYC-WTC_000208440