NYC-WTC_000232458

NYC 9/11 Public Portal Document

10/17/01 WED 08:19 FAX 212 598 4283 ATC ENVIRONMENTAL ,121001

I . 104 Cast 25th Street. New-York. New York 10010 www.atc-enviro.com

I ASSOCIATES INC. 212.353.8280 Fax 212.353.8306

October 15, 2001 • Warren & Panzer Engineers, P.C. I 228 E. 45th Street New York, NY 10017 Attn: Mr. Fabio Pedone

Re: Report of TEM Analysis Dear Mr. Pedone:- Following eire the results of transmission electron microscopy. (TEM) analysis of 4 wipe samples from our Group No. '5692;

I Client; NYCSCA Project Name; P.S. 234M W&P File Numbers; 1030.S3..01 WKP LOG I.D. Numbers': B011023-01 to 04 I ATC Sample Numbers: 61266-6.1269 Samples received, in TEM Lab: 10/15/01

I These results w.i.,11 confirm and document the data transmitted today to your office. 'Each sample was sonicated to produce. TOO ml of a suspension of released particulates and possible asbestos .structures. Each suspension in its entirety was passed through a' 0.1 um .polycarbonate filter, carbon coated, the filter di-SSOlved, and analyzed. Only traces of chrysotile asbestos structures were

I detected in each filter.

The analyses'were supervised by Dr. Michael A. Gorycki, Director of I 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 ELAP program, as is currently required for recognized analysis of TEM air samples for AHERA projects. These analyses were I performed 'by ATC d/b/a ATC Associates Inc. , This report may be reproduced only in its entirety and not without prior' permissio-n of this . laboratory. Please contact, me regarding any questions relating

I to these materials.

Very truly your.s, I I Michael A. Gorycki, Ph.D. Director of Electron Microscopy

I I CITY_21MC100_010238133

NYC-WTC_000232458