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Airtek re-occupancy notice and chain of custody, 176 Broadway

Machine-extracted title · confidence 90%

Airtek Environmental Corp. submits a notice of air quality testing results and chain of custody forms for 176 Broadway in October 2001.

NYC-WTC_000105771–000105777

Folder label: “176 BROADWAY; Block: 65 Lot: 17 BIN: 1001100 3-7 Maiden Lane

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NYC 9/11 Public Portal Document

Summary of Asbestos Sampling Results Page 2 of 2

Address: 176 Broadway Date sampled: Nov 28, 2001

Air samples

Airborne fibers determined by Phased Contrast Microscopy (PCM): An air sample is as

collected by pulling air through a filter. The filter catches fibers and is then sent to a laboratory to determine what types of fibers were in the air. Phase contrast microscopy identifies fibers based on size and shape, but not mineral composition. Therefore, the fibers seen by PCM include asbestos fibers as well as other fibers, such as textiles, fiberglass, cellulose, which might be present in your home

[Area Sampled Outside Common Residence 1 tResidence 2 Sample Numbers -0-22 -C-22 -Rl-22 -R2-22 -R2-X-22* oncentration of Fibers in Air z.001 .001 .001 .001 at this location .001* oncentration of Fibers in Air .001 .001 to .003 .001 to .003 .001 to .003 t background locations Screening Value** .01 f/cc .01 f/cc .01 f/cc .01 flcc

*Denotes co-located, 2nd sample

**Screening Value — The NYC standard for asbestos in community and residential buildings is 0.01 fibers/cubic centimeter (f/cc) in indoor air. This standard is used for re-occupancy in an indoor area where asbestos was detected and removed.

J:\Summary of Asbestos Sampling Results.doc

NYC-WTC 000105777

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NYC-WTC_000105777Source: NYC Law Department, mirrored locally

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