Asbestos sampling summary, 16 Chambers Street, December 2001

NYC 9/11 Public Portal Document

Sr/mmary ofAsbestos Sampling Results Page 2 of 3 Address: 16 Jay Street Date sampled: December 1, 2001

Results of Phase Contrast Microscopy (PCM) testing of air at 16 Jay Street, December 1, 2001

Area Sampled Outside Common Residence 1 Residence 2

Sample Numbers A-0-26 A-C-26 A-Rl-26 A-R2-26

Concentration of Fibers in Air at 16 Jay Street (Ecc)* 0.001 0.004 0.012 <0.001

Concentration of Fibers (Ecc) in comparison <0.001 to 0.001 <0.001 to 0.002 <0.001 to 0.003 <0.001 to 0.003 locations InYC Re-Occupancy llstandard (f/cc) ** 0.01 0.01 0.01 0.01 * fZcc is fibers in each cubic centimeter (cc) of air. This is calculated from the number of fibers seen on the air filter and the volume of air pulled through the filter measured in cubic centimeters of air. ** New York City Department of Environmental Protection asbestos clearance criteria for post-abatement work (Rules of the City of New York, Title 15, Chapter 1)

Asbestos in air as determined by TEM analysis: TEM analysis is very specific and can distinguish between asbestos and non-asbestos fibers, such as textiles, fiberglass, or cellulose. This analysis determines if the fibers seen in the PCM analysis are asbestos, or if they are some other material. TEM analysis was conducted on all air samples that showed more than 0.003 f/cc in the air by PCM analysis. No asbestos fibers were found in the TEM analysis of the two air samples in your building where PCM levels exceeded 0.003 fZcc.^

TEM) testing of air at 16 Jay Street, Dec. 1, 2001 Results of Transmission Electron Microscopy ===£=ss= Area Sampled Common Residence 1

Sample Numbers A-C-26 A-Rl-26 Concentration of Asbestos Fibers in Air at 16 <0.001 <0.001 Jay Street (Ecc)* _____________________ Concentration of All Fibers in Air at comparison <0.001 to 0.003 <0.001 to 0.003 locations (Ecc) _____________________ NYC Re-occupancy Standard (f/cc)** 0.01 0.01 ■ ■■ ■ ■ I .. ——— I I...' ' "" III I - I.................................................... I ... ................................................ ,

* f/cc is fibers in each cubic centimeter (cc) of air. This is calculated from the number of fibers seen on the air filter and the volume of air pulled through the filter measured in cubic centimeters of air. ♦* New York City Department of Environmental Protection asbestos clearance criteria for post-abatement work (Rules of the City of New York, Title 15, Chapter 1)

2 The TEM method employed here, NIOSH 7402, counts fibers of the same size as those detected by PCM analysis. Fibers reported here are greater than or equal to 5 microns in length and 0.25 microns in width.

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