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Chain of custody for air samples from 125 Water Street,

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Custody form documenting the transfer and analysis of air samples collected at 125 Water Street in September 2002.

NYC-WTC_000129725–000130035
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NYC 9/11 Public Portal Document

104 East 25th St.. 109 New York. New York 10( www.atc-enviro.c 212.353.8. Fax 212.353.8:

A S S O C I A T E S I N C

September 23, 2002 ATC Associates Inc. 104 East 25th Street New York, NY 10010

Attn: Mr. Fred Burkhardt

Re: Report of TEM Analysis

Dear Mr. Burkhardt: electron microscopy (TEM) Following are the results of transmission 8863: analysis of air samples from our Group No.

Client: D.E.P. NY, NY Project Name: D.E.P. Clean-up, 125 Cedar St., Location: Around Building Samples received: 09/19/02 the data transmitted today These results will confirm and document performed in strict conformance • to your office. The analyses were Rule (CFR October 30, 1987) with the methodology of the AHERA Final for clearance of abatement sites. may be found on the attached The results of the sample analyses document. function of air volume Results reported as Struct/cc are a such, not verifiable by this collected in the field and are, as reproduced only in its entirety and laboratory. This report may be laboratory. not without prior permission of this TEM lab has received full We are pleased to note that our required for recognized accreditation from NVLAP, as is currently projects, and also approval analysis of TEM air samples for AHERA program. These analyses were under the NY State DOH ELAP performed by ATC d/b/a ATC Associates Inc. questions relating to these Please contact me regarding any materials.

Very truly yours,

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

NYC-WTC 000129786

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NYC-WTC_000129786Source: NYC Law Department, mirrored locally

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