NYC-WTC_000220039

NYC 9/11 Public Portal Document tV’T 4.^^! t

1 New York, New York 10010 www.atc-enviro.com 212.353.8280 Fax 212.353.8306 ASSOCIATES INC.

November 19, 2001

Warren Sc Panzer Engineers, P.C. 228 E. 45th Street New York, NY 10017 Attn: Mr. Fabio Pedone Re; Report of TEM Analysis

Dear Mr. Pedone; Following stre the results of transmission electron microscopy (T3M) analysis of air samples from our Group No; 5928. Client: NYCDDC Address: American Express Building Location: 30th Floor Samples received: 11/19/01 These results will confirm and document the data transmitted to you by telephone and Fax today. The analyses were performed in strict conformance with the methodology of the AHERA Final Rule (CFR October 30, 1987) for clearance of abatement sites. As indicated on the attached document, no asbestos structures were detected in any of the five background samples submitted from the site.- Results reported as Struct/cc are a function of air volume collected in the field and are, as such, not verifiable by this laboratory. This report may be reproduced only in its entirety and not without prior permission of this laboratory. If inside post- abatement samples pass, the response action may be considered to have been completed. The analyses were performed by Dr. Michael A. Gorycki, Director of Electron Microscopy. We are pleased to note that our TEM lab has received full accreditation from NVLAP and also approval under the NY State DOH SLAP program, as is currently required for recognised analysis of TEM air samples for AHERA projects. These analyses v;ere performed by ATC d/b/a ATC Associates Inc. Please contact me regarding any questions relating to these materials.

Very truly yours,

Wichael A. Gorycrki, Ph.D. Director of Electron Microscopy

CITY_21MC100_002883287

NYC-WTC_000220039