NYC-WTC_000206751

NYC 9/11 Public Portal Document

Personal air monitoring

Agency Location Activity N N above Maximum Comment samples OSHA (fibers per PEL* cc) Con Ed Hot Zone Cable splicing 2 0 <0.007 in manhole Hot Zone Walking - 4 0 0.012 various locations OSHA Data not received at DOH as of 4 pm Federal Data not received at DOH as of 4 pm Occupational Health *0.1 fibers per cc. US-OSHA permissible exposure limit for 8 hour time weighted average. Results are by PCM method.

Bulk (settled) dust

Agency Date Location N N asbestos N> 1% Maximum Comment samples detected (%) USEPA 9/18/01 Hot zone, close in 11 10 6 1.9%

Interpretation: The most recent ambient air samples in and around WTC and Fresh Kills, generally well below permissible exposure limits for occupational exposure and, in most cases, for community exposure. However, potential for higher exposures exist based on past personal air samples and presence of asbestos in dust and debris. Continued use of appropriate respiratory protection for workers in or near potentially dusty locations or tasks is indicated. Dust suppression measures should be expanded. Additional personal monitoring underway.

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NYC-WTC_000206752