NYC-WTC_000202307

NYC 9/11 Public Portal Document

104 East 25th St., 10th Floor

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

December 26, 20C2 N.Y.C. Board cf Education 28-11 Queens Plaza North Long Island City, NY 11101

Attn: Mr. Bernard Orlan

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. 9210:

Project Name: P.S.- 89M,; 201. Warren St., NY, NY Location: Throughout the Br\ilding and Roof Samples received: 12/26/02

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 clearanoe of abatement sites.

The results oi the sample analyses are as indicated on the attached document.

Copies of the bench sheets are also included as stipulated by AHERA. .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 pe'cmission of'this laboratory. If pose-abatement inside samples pass, the response action may be considered to have been completed. ' 2

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 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. Gorycki, Ph.D. Director of Electron M.tcroscopy

CITY_21MC100_011276449

NYC-WTC_000202307