NYC-WTC_000209888

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS LAE GROUP 3

Lot S.r.n;plr: Nt 'im

.nc 3pl Nc ~er Area mm

Inscruinerx . 0. Grid :.s No .

Screen Magr.i f icac ton 16,4QQZ IGCl .Area 3.011 mn Coming

Acc. Voltage 3 0 kV Nc . CO oe Analyzed 4 -ICC

GO, structure structure Type Length I.D. of Structure »0.S um j ■ (Nonasb. No Coord. No. FB C M Sum Chrys. Amphibole ■ Nonasb. Ambig./ND! Elements) < 5 um

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i ■ Photo No. (from I in 5 asbestos- Identify all structures uain< EDS Check diffraction for asbestos Store all unrepeated spectra — containing samples) Grid acceptance:! structures up to 70a/Am (UI 4) <50% undiaaolveo filter, overlapped or /oldeo Struct. = > 0.5um Ie > 5:1 Aspect Ratio <1OX particulate coverage >50X coverage Ns Not Obaerved (EDS spectrum or diffraction pattern) at least 20 unfolded or overlapped grid squares Totals <SX holes or ooaque areas Positive diffraction pattern preperlies conforming F B C M > Sum to laboratory Identlflcallon criteria observed. ■Unused portion For chrysotile: O.Tdnm apacing for (Q20) renectlons. of niter Chrysotile ! i 0.33nm spacing for the layer line repeat, streaking -Avoided portion I of (110) and (130) refleetiona. 7' For amphiboles: 0.33nm layer line repeat, and approx. II / portion of filter I J or niter (2m(n wide) 3.3 rslia of nen-twinned layer Une spot spacing to H 11 1 subject to sxaminsllan i I i h Amphibole i layer Une repeat diaUnca (Q.33nm).

EDS ipectrum conforming lo laboratory idenUflcation criteria observed. .4.V1PH1BQLES Ambiguous ' F= Single Fiber (1-3 intersections a 1-3 fibers) r ! Amosite H= Bundle (>3 fibers <X fiber diameter apart) c- Cluster (>3 InU i) ______________ ZSmm Uttar I Crocidolite .Von-asbestos i J Stopping Rules: 1_______ I Anthophyllite i M= Matrix NSD= Ho Structures Detected >50 i/C.O. ar in 1st 4 G.O. Tremolite ! - Actinolite j Non-ldentified L\DAT*\PRlVATE\MIKEC\CADD'a'EU3 9/22/98

CITY_21MC100_002849286

NYC-WTC_000209928