Air sampling summary letter, 225 Rector Place, Jan 2002

NYC 9/11 Public Portal Document

104 East 25th Street New York. New York 10010 www.atc-enviro.com 212.353.8280 Fax 212.353.8306 A S S O C I A T ES I N C.

November 30, 2001 ATC Associates Inc. 104 East 25th Street New York, NY 10010 Attn: Mr. Fred Burkhardt

Re: Report of TEM Analysis

Dear Mr. Burkhardt: microscopy (TEM) Following are the results of transmission electron analysis of air samples from our Group No. 5994:

Client: 225 Rector Place Project Name: 225 Rector Place, NY, NY Location: Various Sites Samples received: 11/29/01 transmitted today These results will confirm and document the data conformance were performed in strict to your office. The analyses AHERA Final Rule (CFR October 30, 1987) with the methodology of the indicated on abatement sites. The results are as for clearance of were MMI TEM cassettes, Lot No- 00265916, the attached document. used. air volume Results reported as Struct/cc are a function of verifiable by this collected in the field and are, as such, not in its entirety and laboratory. This report may be reproduced only laboratory. If the post- not without prior permission of this may be abatement inside samples pass, the response action The analyses were supervised by considered to have been completed. Director of Electron Microscopy. Dr. Michael A. Gorycki, has received full We are pleased to note that our TEM lab accreditation from NVLAP, as is currently required for recognized approval analysis of TEM air samples for AHERA projects, and also analyses were performed under the NY State DOH ELAP program. These by ATC d/b/a ATC Associates Inc. me regarding any questions relating to these Please contact materials.

Very truly yours,

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

NYC-WTC 000124093