Asbestos TEM analysis results, Sept 28, 2001

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS LAB GROUP #: 55-74 - 09/28/01

Lab Sample No. 59646 Filter Type MCE 25 mm Operator Client Spl. No, T29 Filter Area 3 85 mm“^2 Instrument I.D. EM 10 CRX Grid I.D. Disk No. rn ■ - (GO) Area 0,01124 mm"2 Screen Magnification 15,4Q0X Comments Acc. Voltage 8 0 kV No. GO to. be Analyzed ( 4.721 Struct. Corsed. to 70 s/mni"2.)

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

2. .3

J'

n

n

Photo No. (from 1 in 5 asbestos- Identify all structures using EDS Check diffraction for asbestos Store all unrepeated spectra containing samples) Grid acceptance:! structures up to 70s/&im (lat 4) n Struct. = > O.Sum Je > 5:1 Aspect Ratio <5QX undissolved filter, overlapped or folded <10X particulate coverage >50% coverage Totals LJ N= Not Observed (EDS spectrum or diffraction pattern) at least 20 unfolded or overlapped grid squares <5% holes or opaque areas F B C M > Sum Positive diffraction pattern properties conforming to laboratory identification criteria observed. ■Unuaed portion For chrysotile: 0.73nm spacing for (020) renectlons. O.sanm spacing for the layer line repent, streaking of niter -Avoided portion Chrysotile I I of (110) and (130) reflections. of filler u For amphiboles: 0.53nni layer Une repeat, and approx. 3.2 ratio of non-l*inned layer line spot spacing to Portion of filter subject to examination (2mm wide} Amphibole layer tine repeat distance (O.S3nm). EDS apectrum conforming to laboratory Ambiguous identification criteria observed. AMPHIBOLES F= Single Fiber (i-3 Intereections = 1-3 fibers) Amosite B= Bundle (>3 fibers <1 fiber diameter apart) 25mm filler Crocidolite Non-asbestos C= Cluster (>3 intersections) -------i Slopping Rules: L__. M= Matrix Anthophyllite NSD= No Structures Detected [>50 i/C.O. or in lit 4 G-O. Tremolite Actinolite Non-Identified L:\DATA\PRlYATB\MlKgG\CADDVEM3 8/22/96 LJ

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