NYC-WTC_000202425

NYC 9/11 Public Portal Document

104 East 25th St, 10th Floor New York, New York 10010 www.atc-enviro.com 212.353.8280 Fax 212.353.8306 ASSOCIATES INC.

December 23, 2002 N.Y.C. Board of Education 28-11 Queens Plaza North Long Island Cicy, NY 11101 ! Attn; Mr. Bernard Crlan

Re: Report of TEM Analysis

Dear Mr. OrIan;

Following are the results of transmission electron microscopy (TEM) analysis of air samples from our Group No. 9205:

Project Name: P 3. 150M, 334 Greenwich St., NY, NY Location; Vario.tS Locations Samples received; 12/23/02

These results will confirm and document the data transmitted today to Mr. Yiannis Efstathiou, Project Manager, of our office. The analyses were performed in conformance with the methodology of the AHERA Final Rule (40 CFR Part 763, Appendix A to Subpart E, October 30, 1987) for clearance of abatement sites.

The results of the samp.’.e analyses are as indicated on the attached document.

Copies of the bench sheets are also included as stipulated by AHERA. Results reposted as Struct/cc are a function of air volume collected in the f.'eld 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 post-abatement inside samples pass, the response action may be considered to have been completed.

We are pleased to note that our TEM lab has received full accreditation from NVLAP, as is currently required for recognized analysis cf TEM air samples for AHERA projects, and also approval under the NY State DOH ELAP program. 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. Gcrycki, Fn.D. Director of Electron Microscopy

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NYC-WTC_000202425