NYC-WTC_000188691

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS LAB- GROUP #; 48 - 10/23./01 Lab Sample No. 6206? Operator Ciient Spl. Nc. .er .Area 38 5 mm’ Instrument I.D. SM 10 CRX Grid I.D 473’ Disk No. Screen Magnification 16,400X (GO) Area 0.01124 mw Comments Aco, Voidage 8 0 kV No. GO 00 De Analyzed _4 3.147 Struct. Corsod 70 s/mtn*2

GO. Structure Structure Type Length I.D. of Structure N or EDS >0.5 uro (Nonasb. No. Coord. No. F B C M :> Sum Chrys. Amphibole Nonasb. Ambig./ND Elements' < 5 um

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Store all unrepeated spectra-^ Photo No. (from 1 in 5 asbestoa- Identify all structures using EDS Check diffraction for asbestos containing samples) Grid acceptance:! glruclures up to TOs/l^m (HI 4) <50% undisaolved filter, overlapped or folded Struct. = > Q.5um & > 5:1 Aspect Ratio <10% particulate coverage >50% coverage Ns Not Observed (EDS spectrum or diffraction pattern) at least 20 unfolded or overlapped grid squares Totals. ,/'= Positive diffraction pattern properties conforming <SX holes or opaque areas F B C M > Sum to laboratory identification criteria observed. -Unused portion For ehryaotlle: 0.73nm spacing for (D20) reflections. of niter Chrysotile 0.53nm spacing for the layer line repeat, streaking ‘Avoided portion of (110) and (130) rerieeUona. or niter For amphlbolee: Q.53nm layer line repeat, and approx. Portion of niter (2mm wide) 3.3 ratio of non-twinned layer line spot spacing to subject to examination Amphibole layer Une repeat distance (O.SSnm). EDS spectrum conforming to laboratory Ambiguous Identification criteria observed. AMPHIBOLES F= Single Fiber (l*-3 intersections = 1~3 fibers) Amosite B= Bundle f>3 fibers <1 fiber diameter apart) C= Cluster (>3 intersecbona) J asmm niter b..i—. I Crocidolite .Non—asbestos «= Matrix I--------- ‘Stopping Huies; 1--------- - Anthophyllite NSD= No Structures Detected | >00 a/G.Q. or in 1st 4 G.O. j Tremolite Ac Linolite Non-Identified L;\DATA\ PRIVATES MIKKC\ CADD'^EM3 8/22/9B

CITY_21MC100_003082582

NYC-WTC_000188691