Asbestos sampling summary, 16 Chambers Street, December 2001

NYC 9/11 Public Portal Document

Simmary ofAsbestos Sampling Results Page 3 of 3 Address: J6 Jay Street Date sampled: December J, 2001

ASBESTOS DUST TEST RESULTS In general, the dust and debris samples were examined by two different laboratory methods for asbestos fibers, Polarized Light Microscopy (PLM) and Transmission Electron Microscopy (TEM). PLM is used to define asbestos containing material in dust and debris. A material is considered to be asbestos containing material if it contains more than 1% asbestos using the PLM method. The PLM method only counts the larger asbestos fibers. Therefore, if results by PLM were not greater than 1% asbestos, the sample was then analyzed by the TEM method that does count the smaller fibers. However, TEM analysis is not used for regulatory purposes for dust samples.

No asbestos fibers were found in the dust samples from the common area or in the two residences by the PLM laboratory method. No dust was available to sample outside of your building. TEM analysis also did not detect any asbestos in the indoor dust.

Fibrous materials in dust found by PLM Analysis: Polarized Light Microscopy identifies asbestos fibers by shape and optical characteristics. Other fibers such as fabric (synthetics), paper (cellulose) and fiberglass may be identified in the analysis. The laboratory analyst counts the fibers present to give an estimate of fiber content. PLM is used for regulatory purposes for dust samples.

Results of Polarized Light Microscopy (PLM) testing of dust at 16 Jay Street, December 1, 2001 Area Sampled Outside Common Residence 1 Residence 2 Sample Numbers No Dust VA-C-26 VA-Rl-26 VA-R2-26 Available

Asbestos fibers (%) No Dust None Detected None Detected None Detected Available

Asbestos in dust as determined by TEM Analysis: TEM analysis was conducted on all dust samples that showed asbestos content by PLM as less than 1% (if sufficient quantities were available). TEM analysis is very specific, can detect smaller fibers of asbestos, and is subject to less interference. This analysis was done to confirm the above PLM findings of no asbestos found. TEM analysis is not used for regulatory purposes for dust samples.

Results of Transmission Electron Microscopy (TEM) testing of dust at 16 Jay Street, December 1, 2001

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Sample Numbers No Dust VA-C-26 VA-Rl-26 VA-R2-26 Available

Asbestos fibers (%) No Dust None Detected None Detected None Detected Available

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