Asbestos TEM analysis results, Sept 24, 2001

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS LAB GROUP #: 5554 - Q9/24/Q1 Lab Sample No. 5 9455 Filter Type MCE 25 mm Operator Client Spl. No. 09-24 r.l4 Filter Area .385 mm^2 Instrument I.D. EM lO CRX Grid ".D. ■ Disk No.

Screen Magnification 16,4G0X (GO; Area 0,01124 mm"2 Comnients Acc. Voltage 8 0 kV No. GO to be Analyzed __5 ( 4.721 Struct. Corspd. to 70 s/mm'^2.) U

GO. structure Structure Type Length I.D. of Structure EDS ^0.5 um (Nonasb. No, Coord. No. F B C M 5um Chrys. Amphibole Nonasb. Ambig./ND Elements) < 5 um f P2. 4 1/

V2 It A ^<5 6

r'l

Photo No. (from I in 5 asbestos- Identify ail atructuree using EDS Check diffraction for asbestos Store all unrepested spectra containing samples) Grid acceptance:! structures up to 70a/^m (Isl 4) ■'1 <50% undiaaolvea filter, overlapped or folded StrucL = > 0,5um & > 5:1 Aspect Ratio <IOS particulate coverage >50X coverage Totals N= Not Observed (EDS spectrum or diffraction pattern) at least 20 unfolded or overlapped grid squares <5X holes or opaoue areas F B C M > Sum Positive diffraction pattern properties conforming to laboratory identification criteria observed. -Unused portion For chrysotile; 0.73nm spacinc for (020) reflections, 0.33nm spacinc for the layer line repeat, slreaklnf of filter Chrysotile -Avoided portion of (110) and (130) reflections. of filter For amphiboles: O.SSnm layer Une repeat, tad tpprox. Portion of filter (2mm wide^ 3.5 ratio of non-twinned layer Une spot spacinc subject to examination Amphibole layer Une repeat distance (Q.53nm). EDS spectrum conforming to laboratory identification criteria observed. AMPHIBOLES Ambiguous P» Single Fiber (1-3 intersections = 1-3 fibers) Amosite 9= Bundle (>3 fibers <1 fiber diameter apart) C= ClueUr (>3 inUrseclione} 25mm niter Crocidolite Non-asbestos ____ LStopping Rules: !------- Anthophyllite Ms Matrix >30 s/G.O. or in 1st 4 G.Q. Tremolite NSDss No Slructurea DetBcted Actinolite Non-Identified L;\ 0ATA\ PRI VATE\ MIKEC\ CAD0VSM3 s/32/ea

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