Asbestos TEM analysis results, Sept 24, 2001

NYC 9/11 Public Portal Document

.__ I ATC ASSOCIATES INC. TEM ANALYSIS LAB GROUP #: 5554 - 09/24/01

Lab Sample No. 521^6 Filter Type MCE 25 mm Operator uc P Client Sol. No, 09-24-05 Filter Area 385 mrkj Instrument I.D. EM 10 CRX Grid I.D. f Disk No. Screen Magnification 16,4OOX (GO) Area 0.01124 mm^2 Commer.ts Acc. Voltage 8 0 kV No. GO to be Analyzed _5 ( 3.934 Struct. Corspd. to 70 s/mm^2.)

Length I.D. of Structure EDS GO. Structure Structure Type (Nonasb. f—1 >0.5 um No, Coord. No. F B C M < 5 um > Sum Chrys. Amphibole Nonasb. Ambig./ND Elements)

25

J'

r'i

Lj

Store all unrepeated spectra-^ Photo No. (from 1 in 5 asbestos-* identify all atructurea using EDS Chee e diffraction for asbeatoa containing samples) Grid acceptance:! structures up to 70a/^m (1st 4) <50X undissolvea filter, overlapped or folded Struct. = > 0.5um & > 5:1 Aspect Ratio <10% particulate coverage >50% coverage Totals Ns Not Observed (EDS spectrum or diffraction pattern) at least 20 unfolded or overlapped grid squares Positive diffraction pattern properties conforming <5% holes or opaque areas F B C M > Sum to laboratory identification criteria observed. •Unused portion Por chrysotile; 0.73nm spacing for (020) reflsctions. O.&Snm spacing for the layer line repeat, streaking of filter Chrysotile -Avoided portion of (110) and reflections. of filter For amphiboles: O.S3nm layer line repeat, and approx. Portion of filter (2mm wide) 3.5 ratio of non-twinned layer line spot spacing to subject to axaminatlen Amphibole layer line repeat distance (0.53nm). EDS spectrum conforming to laboratory identification criteria observed. AMPHIBOLES Ambiguous rn Pts Single Fiber (i-3 intersections = 1-3 fibers) Amosite B- Bundle (>3 fibers <1 fiber diameter apart) C= Cluster (>3 intersections) 25infn filter Crocidolite Non—asbestos —Stopping Rules: L... , . Anthophyllite W= Matrix >50 s/C.O. or in 1st 4 G-O. Tremolite NSD= No Structure. Oetectod Actinolite Non-Identified r-i L:\DATA\PRIVATE\ M1KEC\ CADDAJEMa B/22/9a

NYC-WTC_000174881