Ambient air sampling report Book Two for 105 Duane Street,

NYC 9/11 Public Portal Document

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December 20, 2001 ATC Associates Inc. • 104 East 25th Street New York, NY 10 010

Attn: Mr. Fred Eurkha_d_

Re: ?=port of TEM A_a_ys_s

' Dear Mr. Burkhardt:

Following are the results of rans;;.fission electron microscopy (TEM) I analysis of air samples from our Group No 6159:

Client: Tribeca Towers Project Name: 105 Duane Street, NY, NY Location: Various Apts. Samples received: 12/20/01

These results will confirm and document the data transmitted today to your office. The analyses were performed _n strict conformance with the methodology of the AEP Final ..u__ (CFR October 30, 1967)

I for clearance of abatement sites.

The results of the sample analyses may be found on the attached document. MMi TEM cassettes, Lot No. CO2=3915, were used.

Results reported as Struct/cc are a function of air volume collected in the field and are, as such, not verifiable by this I laboratory. This report may be reproduced only in its entirety and not without prior permission of this laboratory. The analyses were supervised by Zr. Michael A. Gorycki, Director of Electron

I Microscopy.

we arepleased to note that our TEM lab has received full from NVLAP, as is current:.vrequired for recognized analysis of TEM air for A.zEP_: projects, and also approval accreditation under the NY State DOH _.~._ proram. These analyses were

r performed by ATC d/b/a ATC Associates

Please contact me regarding any questions relating to these materials.

I Very _u yours

I Michael A. or1cki, Ph.:. _recto_ of Eectron Mi:roscct

I NYC-WTC 000104473