NYC-WTC_000189347

NYC 9/11 Public Portal Document

104 East 25th St 10th Floor New York New York 10010 WWW ate envirocom 212 353 8280 Fax 212 353 8306 ASSOCIATES INC

April 13 2002 NYC Board of Education 28-11 Queens Plaza North 14584-0864 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 7393

Project Name H S for Leadership & Public Service, 90 Trinity Pl Location As Per Protocol Samples received 04/12/02

These results will confirm and document the data transmitted today to Mr Mark Tejesen Project Manager of our office The analyses were performed in strict conformance with the methodology of the TkHERA 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 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 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 lull 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

Wichael A Gorycki Ph D Director of Electron Microscopy

CITY_21MC100_003085922

NYC-WTC_000189347