Asbestos TEM analysis results, Sept 24, 2001

NYC 9/11 Public Portal Document

LjJ ATC ASSOCIATES INC. TEM ANALYSIS LAB GROUP'#-: 5554 - 09/24/01 Lab Sample No. 59447 Filter Type MCE 25 mm Op e r a t o r

Client Spl, No. 09-24-36 Filter Area 385 mm^2 . Instrument I.D. EM 10 CRX Grid I.E. Disk No. r.. 1 Screen Magnification 15,4Q0X (GO) Area 0.01124 mm^2 Comments

Acc. Voltage 3 0 kV No. GO to be Analysed 5 ( 3.934 Struct. Corspd. to 7Q s/Tr.Tn'"2.)

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

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Photo No. (from 1 in 5 asbestos- Identify all atrueturea using EDS Check diffraction for asbeatoa Store all unrepeated spectra — containing samples) Grid acceptance;} structures i uo to 70a/^m (lat 4) <50% undiasoived filter., overlapped or loideoT Struct. = > Q.5um & > 5:1 Aspect Ratio <10% particulate coverage >50% coverage Totals Not Observed (EDS spectrum or diffraction pattern) at least 20 unfolded or overlapped grid squares J Positive diffraction pattern properties conforming <5% holes or opaque areas F B C M > Sum to laboratory identification criteria observed. -Unuaed portion For chrysotile; C.73nm soaclnr for (OSO) reflections, of niter Chrysotile O.banm spacinc for the layer tine repeat, streakinc ‘Avoided portion of (no) and (ISO) reflections. of niter Por amphiboles: Q.S3nm layer Une repeat, and approx. Portion of filter \ (SmRi wide) 3.5 ratio of non-twlnned layer line spot spacing to •object to Amphibole layer line repeat distance (0.53nm). examination J vY= EDS spectrum conforming to laboratory identification criteria observed. AMPHIBOLES Ambiguous r= Single Fiber (1-3 intersections = 1-3 fibers) Amosite Bundle />3 fibers <1 fiber diameter apart) ____________ 25i^ filter Crocidolite Non—asbestos C= Cluster (>3 intersections) f M= Matrix r Stoppinc Rules: i--------- - Anthophyllite NS0=: No Structures Detected >50 1/G.O. or In lit 4 0.0. Tremolite f =1 Actinolite Non-ldentified L‘\DATA\PRtVATE\MlKEC\CADD\rEM3 9/22/98

NYC-WTC_000174882