Asbestos TEM analysis results, Sept 24, 2001

NYC 9/11 Public Portal Document

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

Lab Sample No. 59461 Filter Type MCE 25 mm Operator LJ Client Spl. No. 09-24-20 Filter Area 385 mm'^2 Instrument I.D. EN 10 GRX Grid I.D. Disk No.

Screen Magnification 16‘, 4C0X (GO) Area 0.01124 mm"! Comments Aco. Voltage 8 0 kV No. GO to be Analysed __5 ( 4.721 Sr.ruct. Corspd- to 70 s/mm^2.)

Structure structure Type Length I.D. of Structure EDS GO. (Nonasb. >0.5 um No, Coord. ■ No. F B C M ** S 11TT» Sum Chrys. Amphibole Nonasb. Ambig./ND Elements)

a J ■—

n

nsj

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/&m (Ist 4) R <50X undiaaolvea filter, overlapped or folded Struct = > O.Bum & > 5:1 Aspect Ratio <10X particulate coverage >50% coverage Totals N= Not Observed (EDS spectrum or diffraction pattern) at least 20 unfolded or overlapped grid squares Positive diffraction pattern properties conforming <5X holes or ooaque areas F B C M > Sum to laboratory identification criteria observed. -Unused portion r'^ Far chrysotile: 0,73nm spacing for (02Q) reflections, 0.53nm spacing for the layer line repeat, streaking of filter Chrysotile 'Avoided portion of (HQ) and (130) reflections. of filter For amphiboles: O.SSnm layer line repeat, and approx. Portion of filter (2mm wide} 3.5 ratio of non-tvinned layer line spot spacing to subject to examine Lian Amphibole layer Une repeat distance (0.53nm).

n EDS spectrum conforming to laboratory identification criteria observed. AMPHIBOLES Ambiguous F= Single Fiber (1-3 Intersections - 1-3 fibers) Amosite a= Bundle (>3 fibers <1 fiber diameter apart) C= Clu8Lar{>3 intersections} 25mm filter Crocidolite Non-asbestos ---- ;----- ! Stoppinc Rules: i------- Anthophyllite M= Matrix ,VSO= No Structures Detected >50 t/C.O. or in 1st 4 G.O. Tremolite Non-Idenlified Actinolite L;\DATA\PR1VATE\MIKKG\CADDVE>« 9/22/88

NYC-WTC_000174885