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NYC-WTC_000208463

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NYC 9/11 Public Portal Document

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Environmental Monitoring Update Data reported to NYC DOH 9/22/01 as of 4 pm

Asbestos x4mbient air monitoring

Agency Date Location N N above N above Maximum Comment samples 0.01 OSHA (fibers/cc) fibers/cc * PEL@ USEPA 9/21/01 Data not received at DOH by 4pm NYC-DEP 9/21/01 5 schools, distant 15 0 0 0.002 by from controlled zone PCM

* Approximately equivalent to indoor clearance level for residences or schools. EPA results by TEM method, NYC-DEP by PCM @ 0.1 fibers per cc by PCM method; US-OSHA permissible exposure limit for 8 hour time weighted average.

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I o o I o o co Draft: 9/24/01, 12:26 PM \EnvironmentalMonitoringUpdate_9_22.doc Page: 1 of 4 o

NYC-WTC_000208463

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NYC-WTC_000208463Source: NYC Law Department, mirrored locally

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