Ambient air sampling report for 105 Duane Street, Feb 2002

NYC 9/11 Public Portal Document

I ATC ASSOCIATES INC. - TEM ANALYSIS LAB GROUP #: 5762 - 10/25/01 Operator Lab Sample No. 62264 Filter Type MCE 25 mm

Client Spl. No. 50 Filter Area 3 5 mm"2 Grid..D. D1SK No. Instrument I.D. EM 10 CRX K 0.01124 mm ^2 Comments Screen Magnification 16400X (GO) Area No. GO to be Analyzed 6 4 72' Struct. Corspd. to 70 s/mm'Z Acc. Voltage 80 kV

N or,/ EDS I.D. of Structure GO. Structure Structure Type Length (Nonasb. No Coord. No. F B C M >. 5urn Chrys. Amphibole Nonasb. Ambig./ND Elements <~5 urn

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I Photo No. from 1 in 5 asbestos- containing samples) Identify all structures using EDS Grid acceptance: <0 uadiasolve sbestos Check diffraction for ap 02 structures up to 05 r, overlapped or o e titm (lit 4) 705j1! Store all unrepeated spectra

Totals Struct. = 0.5um & > 5:1 Aspect Ratio particulate coverage >5= coverage <10% unfolded or overlapped grid squares Nc Not Observed (EDS spectrum or diffraction pattern) at least 20 F B C M > 5um <5X holes or opaque areas ✓a positive diffraction pattern properties conforming UOuead portion to laboratory identification criteria observed. of filter Chrysotile For ebryasulr. 0.79am •peel for (020) reflection.. 0.69nm spewing for the layer lino repeat. streaking Avoided portion of (110) and (190) rneeucna. r ruler niter 2mm wide) Amphibole Far ampblbel o 0.59nm layer line sots ann appre:. I porUo Boor I 9A ratio of non-twinned layer Ile. pot p. 1n2 m esamtnauen layer line repeat distance (0.591.). EDS spectrum conforming to laboratory Ambiguous AMPHIBOLES Identification criteria observed. AIROsite B. Single Fiber (1-9 intersections c 1-3 Pc fiber,) apart) 25mm niter Bundle (>9 fibers <1 fiber diameter Crocidolite Non — asbestos I C= Cluster (>9 intersections) 9bpping Rules: Anthophyllite M. Matrix >so ./c.o. or In ist ♦ 0.0. Trefnolite ~ ;,,,,,;i p Non —Identified NSD= No Structures Detected

NYC-WTC 000104139