Asbestos TEM analysis results, Sept 28, 2001

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS LAB GROPP 5574 - OS/28/01 Lab Sample No. 59547 Filter Type MCE 25 mm Operator UJ Client Spl. No. T3D Filter Area 3S5 mm"2 Instrument I.D. BM 10 CRX Grid I.D. Disk No. ! 1 Screen Magnification 16,400X (GO) Area 0.01124 inm*2 Comments. Acc. Voltage 8 0 kV No. GO to be. Analyzed _6 ( 4.721 Struct. Corspd. to 70 5/nim^2.)

Length I.D. of Structure N or EDS GO. structure structure Type (Nonasb. No Coord. No. >0.5 um Sum F B C M < 5 um Chrys. Amphibole Nonasb. Ambig./ND Elements) UJ

o <7 Z J J A'R n

n

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n Photo No. (from 1 in 5 aabeatoa— Identify all structures using EDS Check diffraction for asbestos Store all unrepeated apectra— containing samples) Grid acceptance:! structures up to 70s,i/mm (l«l 4) R Struct. = > O.Sum & > 5:1 Aspect Ratio <50X undisBolvea niter? overlap^d or folded <10X particulate coverage >50X coverage Totals N= Not Observed (EDS spectrum or diffracUon pattern) at least 20 unfolded or overlapped grid squares <5X holes or opaque areas F I B C M > Sum Positive diffraction pattern properties conforming to laboratory identification criteria observed. •Unused portion For chrysotile: O.TSnm spscinc for (020) reflections, of niter Chrysotile R O.sanm spacing for the layer line repeat, streaking of (110) and (130) reflecUone. -Avoided portion of niter For amphiboles: 0.&3nm layer Une repeat, and approx. PorUon of filter (2mm wide) 3.S ratio of non-twinned layer line spot spacing to subject to Amphibole layer line repeat distance (O.SSnm). examination

\/= EDS spectrum conforming to laboratory Ambiguous identification criteria observed. AMPHIBOLES F= Single Fiber (1-3 intersections = 1-3 fibers) Amosite B= Bundle (>3 fibers <1 fiber diameter apart) 25mm filter Crocidolite Non-asbestos C= Cluster (>3 Intersections) _J Stopping Rules: L M= Matrix f Anthophyllite NSD= No Structures Detected | >50 s/C.O. or in lai 4I c.o. I Tremolite Actinolite Non-Identified L;\DATA\PRrVATE\MIKEC\CADD\(rEM3 8/22/88

NYC-WTC_000174870