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← Document results/DEP Box 36/105 DUANE ST 1001650, 151/1
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Ambient air sampling report Book Two for 105 Duane Street,

Machine-extracted title · confidence 98%

Second volume of ambient air sampling and visual observation results for 105 Duane Street after the WTC collapse.

NYC-WTC_000104321–000104551

Folder label: “105 DUANE ST 1001650, 151/1”

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NYC 9/11 Public Portal Document

ATC Environmental, Inc.

I 104 East 25th Street New York, New York 10010

ATC Associates Inc. Approved N.Y. State ELAP #10879 104 East 25th Street ACCREDITED NVLAP Lab Code # 1187 New York, NY 10010 Report Date: 10/26/01

ASBESTOS FIBER ANALYSIS BY TRANSMISSION ELECTRON MICROSCOPY (TEM) With Fiber Identification by Selected-Area Electron Diffraction (SAED) and Energy-Dispersive X-RAY Spectroscopy (EDS) Method: AHERA Final Rule, EPA Federal Register (40 CFR, Part 763), Vol. 52, No. 210, October 30, 1987

r Sample Identification Analysis Parameters

Project/Site: Tribeca Towers, 105 Duane St. , NY, NY TEM Sample No.: 5771 - 62567

I Date Received: 10/26/01 Various Sires

Grid Openings Analyzed: 6

Project Sample No.: 02 Average Grid Opening: 106.00 um

Air Volume: 1300 liters Total Area Analyzed; 0.0674 mm2

Filter Type: MCE 25 mm diam., Pore Size: 0.45 um Analytical Sensitivity: 14.8 s/mm2 Effective Area: 385 mm2 0.0044 s/oc

---------------------------------------------------------------------------------------------------------------------------------- FIBROUS PARTICULATES ANALYZED Number Observed CONCENTRATION

I Single Fibers Bundles Clusters Matrix Struct. Total. Struct. Total Struct. >=5um Filter Struct/mm2 Struct/cc Air ngm/m3

Chrysotile Asbestos 0 0 0 0 0 0 0.0 0.0000 0

Amphibole Asbestos 0 0 0 0 0 0 0.0 0.0000 0

Ambiguous C 0 0 0 0 0 0.0 0.0000 0

I Total asbestos (includes ambiguous structures) Non-Asbestos Nu Identification C 0 0 0 0 0 0 0 0 0 0 0 0 0 0.0 0.0 0.0 0.0000 0.0000 0.0000 0 N/A N/A

Totals All Structures) 0 0 0.0 0.0000 N/A The estimated uncertainty of this analysis is 1 standard deviation.

----------------------------------------------------------------------------------------------------------------------------------

' Non-asbestos fiber i.d. (EDS/SAED): None detected Amphibole Asbestos Type: None detected ----------------------------------------------------------------------------------------------------------------------------------

' The Analysis was carried out in accordance with the approved TEM method. This laboratory is in compliance with the quality specified for the method.

I Analyzed by: Report Reviewed by:

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

NYC-WTC 000104352

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NYC-WTC_000104352Source: NYC Law Department, mirrored locally

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