Asbestos TEM analysis results, Sept 24, 2001

NYC 9/11 Public Portal Document

l.J ATC ASSOCIATES INC. TEM ANALYSIS LAB GROUP #: 5554 - 09/24/01 Lab Sample No. 59467 Filter Type MCE 25 mm Operator Client Spl. No. 09-24-26 Filter Area 385 mm^2 Instrument I.D. EP: 10 CRX Grid I.D. Disk No. Screen 'Magnification 16,4 0 OX (GO) Area 0.01124 mm^2 Comments Lj ACC. Voltage ' 8C kv No. GO to be Analyzed 6 ( 4.721 Struct. Corspd. to 70 5/mm*~2.)

Length I.D. of Structure n or EDS GO. Structure Structure Type (Nonasb. No, Coord. No. ^0.5 um Sum Lj F B C M < 5 um Chrys. Amphibole Nonasb. Ambig./ND Elements)

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Store all unrepeated spectra—^ Photo No. (from 1 in 5 asbealos- identify all structures using EDS5 Check diffraction for asbestos containing samples) Grid acceptance:! structures up to TOs/i^im (lai 4) <50% undiasoivea filter, overlapped or folded Struct = > 0.5um & > 5:1 Aspect Ratio < lOX particulate coverage >50% coverage Totals Nss Not Observed (EDS spectrum or diffraction pattern) at least 20 unfolded or overlapped grid squares <5% holes or ooaoue areas F B C M Sum y/= Positive diffraction pattern properties conforming Lo laboratory identification criteria observed. -Unuaed portion For chrysotile: 0.7anm spacing for (020) reflections, of filler Chrysotile 0.53nm spacing lor the layer line repeat streaking Ivolded portion of (XIO) and (130) reflections. of filter For amphiboles: 0.53nm layer line repeat and approx. Portion of filter (2mm vide) 3.9 ratio of non-Lwinned layer line spot spacing to subject lo Amphibole layer line repeat distance (O.SSnm). examination

EDS spectrum conforming to laboratory Ambiguous identification criteria observed. AMPHIBOLES F= Single Fiber (1-3 intersections 2= 1-3 fibers) Amosite Bundle (>3 fibers <1 fiber diameter apart) _________ 25inni fill«r Crocidolite Non—asbestos --------- 1 stoppin, Eu,..= I--------- Anthophyllite NS0= No Structure. Detected | >50 ./G.O. or tn l.t 4 g.O. | Tremolite Actinolite Non-Identified U\D*TA\PRIVATE\KiKEC\CADD'J'E«3 0/22/98

NYC-WTC_000174886