NYC-WTC_000201946

NYC 9/11 Public Portal Document

(Satc 104 East 25th St New York, New York 10010 www.atc-enviro.com 212.353.8280 Fax 212.353 8306 ASSOCIATES INC.

March 1, 2002 N.Y.C. Board of Education 28-11 Queens Plaza North 14584-0819 Long Island City, NY 11101

Attn: Mr. Bernard Orlan

Re: Report of TEM Analysis Dear Mr.. Orlan:

Following are the results of transmission electron microscopy (TEM) analysis of air samples from our Group No. 6873: Project Name: P.S. 89M, 201 Warren Screet, NY-, NY Location: All Floors, Playground, Roof,'1st Floor- Hallway Samples received: 02/28'/02

These results will confirm and document the data transmitted today' to Mr. Andreas Andreou,- Project -Manager, of our office.t The, analyses were performed in strict 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 sample analyses are as indicated on the attached document. Copies of the bench sheets are also included as ' stipulated by AHERA.- MMI TEM cassettes. Lot No. 00263916, were used. 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 reporu 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.^ The analyses were supervised by Dr. Michael A. Gorycki, Director of Electron Microscopy. , 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 your-s,

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

CITY_21MC100_003269861

NYC-WTC_000201946