Asbestos TEM analysis results, Oct 20 2001

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS LAB GROUP #: 5735 - 10/20/01 Lab Sample No. 61731 Filter Type MCE 25 mm Ooerator Client Spl, No. 17 Filter Area 385'mm"2 Instrument I.D. EM 10 CRX Grid I.D. Disk No. Screen Magnification 16,40QX (GO) Area 0.0X124 mm^2 Comments Acc. Voltage 80 kv No. GO to be Analysed __4 ( 3.14" Struct. Corspd. to 70 s/mm^2.)

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

Z0O I p.2 I El t /r

store all unrepeated spectra—^ Photo No. {from 1 in 5 asbestos- Identify all structures using SDS Check diffraction for asbestos containing samples) Grid acceptance:! atrueturga up to 7Qb/A1im (Ist 4) <5tiX undisBolvea filter/ overlapped or folded Struct = > O.Sum & > 5:1 Aspect Ratio <IOX particulate coverage >SOX coverage Totals N= Not Observed (SDS spectrum or diffrsetion psttem) at least ZO unfolded or overlapped grid squares Positive diffraction pattern properties conforming <SX holes or opaque areas F B C M > Sum to laboratory identification criteria observed. Unuaed portion of niter For chrysoUle: o.73nm spacinr for (020) refiectiona, O.S3nm spacing for the layer line repeat, streaking Chrysotile Avoided porUen of (110) and (130) refiectiona. of filter For amphiboles: 0.93nm layer line repeat, and approx. Portion of niter (2min wide) 3.S ratio of non-tvlnned layer line apot spacing Lo subject to Amphibole layer line repeat distance (O.S3om). examination

\/= EDS spectrum conforming to laboratory Ambiguous IdentlficaUon criteria observed. AMPHIBOLES Ps single Fiber (1-3 Interacctions a 1-3 fibers) Amosite Ba Bundle (>3 fibers <1 fiber diameter apart) 2amn< nlUr Crocidolite Non—asbestos Ca Cluster (>3 intersections) J SLopplnj Rules: Anthophyllite M= Matrix NSD= No Structures Detected L!\DATA\PRIV*TE\MIKKC\CJU>irTSM3 o/z2/oa [>90 */C.O. or in isl 4 C.O. Tremolite Actinolite Non-ldentified

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