Laboratory report from Hygienetics detailing ambient air sampling results for asbestos fibers at 2 Rector Street.
NYC-WTC_000113977–000113978Folder label: “2 RECTOR STREET 1001031, 51/1”
OCR status: ok · source: pdftotext
NYC 9/11 Public Portal Document
,I f Mr. Victor Purpura September 26, 2001 Page 2
fibers per cubic centimeter (f/cc). This 0.01 f/cc concentration is also referred to as a "Reoccupancy Criteria" by the NYC Department of Environmental Protection.
While the PCM analytical data generated at Two Rector Street was not obtained for the purpose of determining clean air following asbestos activities, the raw analytical results indicate the majority (> 95%) of measured airborne fiber concentrations to be below this commonly accepted criteria value. Sample results ranged from < 0.003 f/cc to 0.013 f/cc. All but four of the air samples collected at Two Rector Street were found to exhibit fiber concentrations below 0.01 f/cc.
With regards to sampling analysis, optical Phase Contrast Microscopy (PCM) is a standard analytical method to assess airborne fiber concentration. This method does not distinguish between asbestos and non-asbestos fiber types, and only those fibers wider than 0.25 micrometers, greater than 5 micrometers in length, and with a length-to-width (aspect) ratio equal to or greater than 3:1 were counted. Because of these limitations, fiber counts by PCM typically provide an "index" of the total concentration of particulates in the ambient air of an occupied building.
Transmission Electron Microscope Re-analysis: The aforementioned four (4) air samples exhibiting elevated (> 0.01 f/cc) PCM results were re- analyzed by Scientific Laboratories using Transmission Electron Microscopy (TEM). This form of analysis, coupled with selected area electron diffraction (SAED) and x-ray energy dispersive spectroscopy (EDS), enables a fiber's chemical composition to be identified, thereby overcoming the aforementioned non-specificity of PCM analysis, allowing a definitive determination of whether the material is asbestos or not.
The laboratory results revealed no asbestos structures were detected in any of the four air samples collected at Two Rector Street that exhibited elevated "total" airborne fiber concentrations via PCM analysis. Copies of the analytical data are attached for your reference.
If you have any questions or comments regarding the information presented herein, please feel free to contact Hygienetics at (212) 244 - 3443.
Very ly yours,
Laurence M. Jaret Project Director
(attachment)
2060.035
NYC-WTC 000113978
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