NYC-WTC_000188003

NYC 9/11 Public Portal Document

IU» tasi zom jueii 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 are the results of transmission electron microscopy (TBM) 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 (OPR 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 o£ 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 fu3JL accreditation from NVLAP and also approval under the NY State DOH ELAP program, as is currently required for recognised analysis of TEM air samples for AHEPA projects, These analyses were performed by ATC d/b/a ATC Associates Inc. Please contact me regarding any questions relating to these materials.

Very truly yours,

Michael A. Gorycki, Ph.D. Director of Electron Microscopy

CITY_21MC100_004714715

NYC-WTC_000188003