Ambient air sampling report Book Two for 105 Duane Street,

NYC 9/11 Public Portal Document

104 East 25th Street V New York, New York 10010 1 www.atc-envirc.com 212.353.8280 Fax 212.353.8306 ASSOC I ATES I N C.

I ATC Associates Inc. December 13, 2001

104 East 25th Street New York, NY 10010 Attn: Mr. Fred Burkhardt

Re: Report of TEM Analysis

Dear Mr. Burkhardt:

Following are the results of transmission electron microscopy (TEM) analysis of air samples from our Group No. 6087:

Client: Tribeca Towers Project Name: 105 Duane Street, NY, NY Location: 10th Floor and Mechanical Room Samples received: 12/13/01

These results will confirm and document the data transmitted today to your office. The analyses were performed in strict conformance with the methodology of the AHERA Final Rule (CFR October 30, 1987) for clearance of abatement sites.

I The results of the sample analyses may be found on the attached document. MMI TEM cassettes, Lot No. 0025916, were used.

r-~ Results reported as Struct/cc are a function of air volume collected in the field and are, as such, not verifiable by this Li laboratory. This report may be reproduced only in its entirety and not without prior permission of this laboratory. If post-abatement

I inside samples pass, the response action may be considered to have been completed. The analyses were supervised by Dr. Michael A. Gorycki, Director of Electron Microscopy.

Li We are pleased to note that our TEM lab has received full accreditation from NVLAP, as is currently required for recognized analysis of TEM air samples for AHERA projects, and also approval I under the NY State DOH ELAP program. performed by ATC d/b/a ATC Associates Inc. These analyses were Please contact me regarding any questions relating to these materials.

I rl Very truly yours,

LI Michael A. Gorycki, Ph.D. Director of Electron Microscopy I I NYC-WTC 000104498