Asbestos TEM analysis results, Oct 18 2001

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS LAB GROUP #; 5725 - 10/18/01 Lab Sample No. 61637 Filter Type MCE 2S mm Operator Client Spl. No. 05 Filter Area 385 [nni"2 Inscrumenc I.D. EM 10 CRY Grid I.D. Disk 'No. Screen Magnification 16,400X (GO) Area Q.01124 mm"2 Comments Acc. Voltage 60 kV No. GO co be Analyzed _4 [ 3.147 Struct. Corsod. to 70 s/mn'‘2.)

GO. structure structure Type Length I.D. of Structure N or EDS >0.5 um (Nonasb. No. Coord. No. F B C M > 5um Chrys. Amphibole < 5 um Nonasb. Ambig./ND Elements) 3/^ / ^5^ KI 5

Store all unrepeated spectra—^ Photo No. (from 1 tn 5 aabestoe- Identify all structurea 'using EDS Check diffraction for asbestos containing samples) Grid acceptance:! structures up to TOs/Am (let 4) <S0X undiasolved filter, overlapped or folded Struct. = > O.Sum & > 5:1 Aspect Ratio <10X particulate coverage >SOX coverage Ns Not Observed (EDS spectrum or diffraction pattern) at least SO unfolded or overlapped grid squares Totals <SX holes or opaque areas F B C M > Sum Positive diffraction pattern properties conforming to laboratory identification criteria observed. Unuaed portion For cbrjsoUla: 0.73nm apacinx for (020) ran«clians. of filler 0.53nm spacing for the layer line repeat, streaking Chrysotile of (HO) and (100) reflecUons. Avoided porlion of filter For amphiboles: Q.SOnm layer line repeat, and' approx., Portion, of niter {2mm wide) 3.5 ratio of non-twinned layer line epoL apaelng Lo I aubjeet In examination Amphibole layer Une repeat distance (O.SOnm). v/= BOS spectrum conforming to laboratory identification criteria observed. AMPHIBOLES Ambiguous P= Single Fiber (1-3 Intersections = 1-3 fibers) Amosite B= Bundle (>3 fibers <1 fiber diameter apart) Cluster (>3 intersections) 25min niter Crocidolite Non-asbestos Jstoppinc Rules: t--------- - Anthophyllite Us Ualrix NSD= No Structurea Delected >50 s/C.O. or In 1st 4 C.O. Tremolite Actinolite Non-Identified L:\DATA\PBIVATE\M1KBC\CADDVEM3 6/22/98

CITY_21MC100_0 03099533

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