NYC-WTC_000209190

NYC 9/11 Public Portal Document

DRAFT

Personal air monitoring

Agency Date Location Activity N N above Maximum Comment samples OSHA (fibers per PEL* cc) Con Ed 9/19/01 Inside Electric 2 0 0.008 by Various locations, not too dusty, wind controlled PCM blowing to south. zone OSHA New data not received at DOH Federal New data not received at DOH Occupational Health

* 0.1 fibers per cc by PCM method; US-OSHA permissible exposure limit for 8 hour time weighted average.

Bulk (settled) dust

Agency Date Location N N asbestos N> 1% Maximum Comment samples detected (%) USEPA 9/19/01- Inside controlled zone , 22 14 11 2.1% Highest at 9/20/01 Stuyvesant HS South. 9/19/01- Neighborhood near controlled 1 0 1 1.8% 70 Battery Place 9/20/01 zone

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 o and presence of asbestos in dust and debris. Continued use of appropriate respiratory protection for workers in or near potentially dusty locations or H tasks is indicated. Dust suppression measures should be expanded. Additional personal monitoring underway.

I o I . O' o, co Draft: 9/23/01 \EnvironmentalMonitoringUpdate_9_2I co Page: 2 of 3 cc o

NYC-WTC_000209191