Asbestos TEM analysis results, Oct 19 2001

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS LAB GROUP fe: 5730 - 10/19/01 Dab Sample No. 61713 FilCer Type 25 mm OperaCor Client: Spl . Wo. 23 Filter Arsa 3 85 mm**2 instrument I.D. EM 10 CRZ Grid I.Dr Disk No, Screen Magnification 16.40OX (GO) Area 0.01124 ■mm^2 Comments Acc. Volcage 8 0 kV Nd. go co be Analysed 4 ( 3.147 Struct. Corspd. co 70 s/mtn^2.1

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

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Photo No. (from 1 in 5 as iesLos— identify ail atructurea using EDS Chee c diffraction for asbestos Store all unrepeated spectra containing aampies) Grid acceptance:! atructurea up to 709/An (l»t 4) <SaX undiaaolved filter/ overlapped or folded Struct. = > 0.5um & > 5:1 Aspect Ratio <10X particulate coverage >S0X coverage Totals N= Not Observed (EDS spectrum or diffraction pattern) at least 20 unfolded or overlapped grid aquarea <5X holea or opaque areas F B C M > Sum Positive diffraction pattern properties conforming to laboratory identification criteria observed. 'Unused portion For chryaotile: O.TSnm spacing for (020) reflecUona, of filter Chrysotile 0.&3nm apaclng for the layer line repeat, atrealclng 'Avoided portion Of (110) and (130) rsflectiona. of Altar For amphiboles: O.S3nm layer line repeat, and approx. Portion of niter (2mm wide) 3.5 ratio of aon-lvlnned layer line apot spacing to aubjeet to axamloatlon Amphibole layer line repeat distance (O.SSnm). £DS spectrum conforming to laboratory Ambiguous identification criteria observed. AMPHIBOLES F= Single Fiber (1-3 intersection* = 1-3 fiber*) . Amosite Bundle (>3 fibers <1 fiber diameter apart) 29mm niter Crocidolite Non—asbestos C= Cluster (>3 Intersections) J stopping Rules: L Matrix Anthophyllite NSD=s Ne Structures Detected >90 i/C.O. or in lat ♦ 0.0. Tremolite Actinolite Non-Identified L:\DATA\PRIVATE\MIKBC\CADDVEM3 0/22/98

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