NYC 9/11 Public Portal Document
10/09/2001 15:25 2125984283 ATC ASSOCIATES PAGE 01/04
104 East 25th Street
New York. New York 10010
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A S S O C 1 1► T E 5 ! N C.
October 8, 2001
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212.353 8280
Fex 212.353.8306
ALC Environmental
115 W. 30th Street
New York, NY 10001
Attn: Mr. Joshua Sarett
Re. Report of TEM Analysis
Dear Mr. Sarett:
microscopy (TEM)
Following are the results of transmission electron
analysis of four PCM air samples from our Group No. 5635:
Client: Mid -State
Project Name: 385 South End Ave. , Bldg. 500
Location: Various Apts.
Samples received: 10/08/01
transmitted to you
These results will confirm and document the data
strict conformance with the
today. The analyses were performed in
methodology of the NIOSH method 7402, Issue 2, August 15, 14.994.
at
Forty grid openings from each of the samples were examined
relatively low magnifications (approximately 1,000X and 10,000X)
between 0.25um
for structures greater than Sum in length and widths
ratio greater than 3:1.
and 3um, and having a length-to-width by PC'1
be large enough to be observed
These structures would
analysis.
samples in the
Only non -asbestos structures were detected in the
following proportions:
gypsum cellulose F/CC as
sample
Asbestos
1 100.0% 0.0% 0.0
100.0% 0.0% 0.0
3
5 0.0% 3.00.0% 0.0
6 42.6% 57.4% 0.0
as asbestos.
As a consequence, no sample exceeds 0.01 F/CC
NYC-WTC 000121471
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