NYC-WTC_000209328

NYC 9/11 Public Portal Document

2001 FRi 12:44 All NiOSH/R-H PAX NO, 5134587147 r.

Centers for Disease Control and Prevention National Institute for Occupational Safety and Health Interim Bulk and Air Sampling Report Wednesday. September 19, 2001 Investigators from the National Instlmtc for Occupational Safety and Health (NIOSH) collected bulk and air samples in areas immediately adjacent to the debris pile and on persoitnel actively involved in rescue efforts in ths vicinity of The debris pile to characterize potential exposures, Below are the interim sampling results for Wednesday, September 19, 2001

Bulk Samples

* 27 bulk samples were collected from undisTurbed loose material within the restricted area o Most samples indic,3tsd less than 1% asbestos (two contained between 1 and 3% asbestos) Cfysinlliiie Silica • 27 bulk samples were collected from imdisrtjrbeid loose material within the restricted area o Al! samples contained quartz, typically in amounts less than 5%, although, one sample v/aa as high as 18% quartz o -None of the samples contained cristobalite

« 27 bulk samples were collected from undisturbed loose material within the rasiricted area o 'Notltlng of concern was found rsgarding meta! analysis

Air Samples AsbssiQS • 3 personal samples and 3 area air samples were collected by NIOSH investigators o All task-based concentrations were below 0.0.5 fsbers/cc as determined by TEM analysis • Additional atr samples 'Acre collected by NYDOH ccntractors (.26 personal and 4 area) o .Personal sample 8-hour time-weighted average c-oncsYitrations were below 0.05 fifaers/cc as determined by PCM o 3 personal samples were analyzed by TEM, all were less than 0,004 fjbers/cc o Aj*ea sample results were below 0 04 fibw&'cc as determined by PCM Tu(al Diisi • 17 air samples were collected for total dust (7 personal and 10 area) o Personal sample 8-hour rime-weighted average concentrations were below l.C mg'nri o Area sample concentrations were below 1.7 mg-'m" Mslal.s • 17 air samples were collected for metals (7 persona! and 19 area) o Nothing O’’ concern was found regarding metal analysis Carbon A'fonoxide • 5 real-time personal breathing zone .samples were collected for carbon monoxide o All 8-hour time-weighted average concentrations were below 3 ppm Q A .single peak of 79 ppm was obsen-ed on a city transit worker Kola/iie Of^nic Compon/ids (VOCs) • fS air samples were collected on thermal desorption tubes (used as a screening technique) c Compounds identified included benzene, toluene, and polynuclear aromatic hydrocarbons which have been attributed to products of combustion o Concentration* of VOCs on all .samples were well below Cfitablished limits • 19 air sample.? were collected with charcoal adsorbent tubes o Concenrrations of VOCs on all samples were below detectable limits

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NYC-WTC_000209328