Laboratory report from ATC Associates providing transmission electron microscopy results for air samples collected at 99 Church Street.
NYC-WTC_000124304–000124612Folder label: “99 CHURCH STREET Block: 123 Lot: 10 BIN: 1001396 26/42 PARK PL, 23-41 BARCLAY ST”
OCR status: ok · source: pdftotext
NYC 9/11 Public Portal Document
104 East 25th Street
TC New York. New York 10010 www.atc-enviro.com 212.353.8280 Fax 212.353.8306 ASSOCIATES INC.
September 20, 2001 ATC Associates Inc. 104 East 25th Street New York, NY 10010 Attn: Mr. Ben Sallemi
Re: Report of TEM Analysis Dear Mr. Sallemi:
Following are the results of transmission electron microscopy (TEM) analysis of one PCM air sample from our Group No. 5532:
Client: 99 Church Street Project Name: 99 Church Street, NY, NY Location: Office on SE Side Sample received in TEM Lab: 09/20/01
These results will confirm and document the data transmitted to you today. The analyses were performed in strict conformance with the methodology of the NIOSH method 7402, Issue 2, August 15, 1994. •
Forty grid openings from the sample were examined at relatively low magnifications (approximately 1,000X and 10,000X) for structures greater than 5um in length and widths between 0.25um and 3um, and having a length-to-width ratio greater than 3:1. These structures would be large enough to be observed by PCM analysis.
Asbestos and non-asbestos structures were detected in the sample in the following proportions:
sample chrysotile gypsum fiber cellulose F/CC as glass Asbestos 04 8.2% 61.2% 23.5% 7.1% 0.0009
As a consequence, the sample does not exceed 0.01 F/CC as asbestos.
The analyses were supervised by Dr. Michael A. Gorycki, Director of Electron Microscopy. These analyses were performed by ATC d/b/a ATC Associates Inc. We are pleased to note that our TEM lab has received full accreditation from NVLAP and also approval under the NY State DOH ELAP program, as is currently required for recognized analysis of TEM air samples for AHERA projects. Please contact me regarding any questions relating to these materials.
Very truly yours,
Michael A. Gorycki, P .D. Director of Electron Microscopy
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