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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.. 10th New York. New York 100 www.atc-enviro cc 212.353.82; Fax 212.353.83, ASSOCIATES INC.

October 5, 2002 ATC Associates Inc. 104 East 25th Street New York, NY 10010

Attn: Mr. Ben Sallemi

Re: Report of TEM Analysis

Dear Mr. Sallemi: microscopy (TEM) Following are the results of transmission electron analysis of air samples from our Group No. 8935:

Client: D.E.P. Project Name: D.E.P. Clean-up, 125 Cedar St., NY, NY Location: Around Building Samples received: 10/04/02 data transmitted today These results will confirm and document the in strict conformance • to your office. The analyses were performed (CFR October 30, 1987) with the methodology of the AHERA Final Rule for clearance of abatement sites. found on the attached The results of the sample analyses may be document. function of air volume Results reported as Struct/cc are a collected in the field and are, as such, not verifiable by this entirety and laboratory. This report may be reproduced only in its laboratory. not without prior permission of this lab has received full We are pleased to note that our TEM for recognized accreditation from NVLAP, as is currently required projects, and also approval analysis of TEM air samples for AHERA were These analyses under the NY State DOH ELAP program. performed by ATC d/b/a ATC Associates Inc.

regarding any questions relating to these Please contact me materials.

Very truly yours,

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

NYC-WTC 000129958

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NYC-WTC_000129958Source: NYC Law Department, mirrored locally

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