Asbestos TEM analysis results, New York City schools, Oct 2001

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS LAB GROUP 5725 : '18/01

Lal Sdiiipie No er Type MTE 25 mm Clieac Sol. NO Filter Area so mm 7 Inst rument i. C> EM ID CRX Gric I.D. Disk No

icresn Magnification 16 4C0Z (GO Area 0.01124 mm~2 Ccmmenrs. Acc. VoIcage 8 0 k.V No. GO to De Analyzed _4 3.147 Struct . Torsoo- to 7D s,/mm*2.l

4Ch Structure Structure Type Length l.D. of Structure EDS ^0.5 um (Nonasb. No Coord. No. F B C M Sum Chrys. Amphibole Nonasb. Ambig./ND Elements) < 5 um

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Photo No. (from 1 in 5 asbestos- identify all structures using EDS Check diffraction for asbestos Store all unrepeated spectra containing samples) Grid acceptance;I structures up to 70g/Am (l«l 4) Struct = > D.Sum > 5:1 Aspect Ratio <50% undisBolvea filter, overlapped or foldea

Ns Not Observed (EDS spectrum or diffraeUon pattern) <10% particulate coverage >50% coverage at least 20 unfolded or overlapped grid squares Totals <SX holes or opaque areas ^/ss Positive diffraction pattern properties conforming F B C M > Sum to laboratory IdenUfication criteria observed. Fur chrysotile: 0.73nm spacing for (020) reflections, O.SOnni spacing for the layer line repeat, streaking of (110) and (130) pefleeLions. •Unused portion or niter ’Avoided portion Chrysotile I of filler Fer amphiboles: a.S3nm layer line repeat and approx. (2mm wide) 3.5 ratio of non-tvinned layer line spot spacing to Amphibole lafer line repeat distance (O.SSnm).

EDS spectrum conforming to laboratory idsnUfieaUon criteria observed. AMPHIBOLES Ambiguous F= Siifle Fiber (1-3 Intersections » 1-3 fibers) Amosite B= Bundle {>3 libera <1 fiber diameter apart) C= Cluster <>3 Intersections) f 25mm filLnr Crocidolite Non-asbestos Stopping Rules: !_______ _ Anthophyllite «= M.itrix >50 i/G.O. or in Isl 4 C.O. I NSDa No Structures Detected Tremolite Actinolite Non-Identified L'XDAlAXPRIVATEXMIKBCXCADDVrMa 9/22/Bfl

CONFIDENTIAL, CITY_21MC100_003470149 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

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