Asbestos sampling summary, 66 and 90 Chambers Street, November 2001

NYC 9/11 Public Portal Document

Summary of Asbestos Sampling Results Page 3 of 3 Address: 66 Franlfort St and 90 Gold St Date sampled: November 20, 2001

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 66 Frankfort St and 90 Gold St., November 20, 2001 [Area Sampled Outside Common Residence 1 Residence 2

Sample Numbers No Dust Available VA-C-11 VA-Rl-11 VA-R2-1I

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

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%. TEM analysis is very specific, can detect smaller fibers of asbestos, and is subject to less interference. This analysis was done to confirm the PLM findings of no asbestos found. However, TEM analysis is not used for regulatory purposes for dust samples.

Results of Transmission Electron Microscopy (TEM) testing of dust at 66 Frankfort St and 90 Gold St., November 20, 2001_________________________________________________ Area Sampled Outside Common Residence 1 Residence 2

Sample Numbers No Dust Available VA-C-11 VA-Rl-11 VA-R2-11

■sbestos fibers (%) No Dust Available None Detected < 1% 1.5%

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