Asbestos TEM analysis results, Sept 28, 2001

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS LAB GROUP #: 5573 -09/28/01

Lab Sample No. 55619 Filter Typ-s MCE 25 mm Operator Client Spl. No. 03 Filter Area 335 mm'^2 / fl

{ -1 Instrument I.D. EM IQ CRX Grid I.D. Disk No. Screen Magnification 16,400X (GO) Area Q.01124 mm"2 Comments Acc. Voltage 80 kV No. GO to be Analyzed _S •721 Stmct. Corsnd. to 70 3/mTn^2.)

Length I.D. of Structure N ar EDS GO. structure Structure Type (Nonasb. No. ^0.5 um No, Coord. F B C M < 5 um Sum Chrys. Amphibole Nonasb. Ambig./ND Elements) f va Pi // ,5 /f // /tlJ 6 (I

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n store alt unrepeated spectra--^ Photo No. (from 1 in S aabestoa- Identify all structurea uaing EDS Check diffraction for aabeatoa PS containing aamplea) Grid acceptance:! atructurea up to 70b/Aiim (let 4) <50% undiasolvea filter? overlapped or /olded Struct, s > O.Sum & > 5:1 Aapect Ratio <10% particulate coverage >50% coverage Totals N= Not Observed (EDS spectrum or diffraction pattern) at least 20 unfolded or overlapped grid squares Positive diffraction pattern properties conforming <5% holes or opaque areas F B C M > Sum to laboratory identification criteria obaerved. Unuied portion For chrysotile: fl.73nm spacing for (020) renacUons, of fUter Chrysotile 0.53nm spacing for the layer line repeat, streaking 'Avoided portion of (110) and (130) reflectiona. of filter U) For amphiboles: O.S3nm layer line repeat, ind approx. (2mm vide) 3.5 ratio of non-tvlnned layer Une spot spacing to Amphibole layer line repeat distance (O.SSnm).

n v/o EOS spectrum conforming to laboratory identification criteria observed. AMPHIBOLES Ambiguous ?= Single Fiber (1-3 Interaectlona = 1-3 fibcra) Amosite a= Sundle (>3 fibera <1 fiber diameter apart) aSmm filter Crocidolite Non-asbestos C= Cluater (>3 intenecUoni) ------- !” stopping Aulea: - Anthophyilile Matrix NSD= No Structurea Detected [ >50 a/G.O. or In lat 4 G.Q. Tremolite Aclinoiile Non-Identified L;\DATA\PRIVATE\MIKBG\CADD\rSM3 9/22/98

NYC-WTC_000174873