Asbestos TEM analysis results, Sept 28, 2001

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS LAB GROUP #: 5573 - 09/28/01 Lab .Sample No. ■59626 Filter Type MCE 25 mm Operator. Client Spl. No. 15 Filter Arsa 385 mm"2 . Instrument I.D. EM 10 CRX Grid I.D. Disk No. Screen Magnification 16,400X (GO5 Area 0.01124 mm"2 Comments Acc. Voltage 8 0 kV No. GO to be Analyzed ( 4.721 Struct. Corspd. to 70 s/mm'^2.)

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

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U A. Photo No. (from 1 in 5 aabeatos- llore all unrepealed apectraF Identify ail atructurea using EDS Check diffracUon for aabeatos containing samples) Grid acceptance:! structures up to.70a/&g (iat 4) <S0X undisaoived filter, overlapped or folded Struct. = > O.Sum Ic > 5:1 Aspect Ratio <10X particulate coverage >6QX coverage Totals N- Not Observed (EOS spectrum or diffraction pattern) at least 20 unfolded or overlapped grid squares Foflitlve diffraction pattern properties confarminf <5X holes or opaque areas________ _______________ F B C M > Sum to laboratory identification criteria obaerved. •Unuaed portion For ebryaotile: 0.73nm spaeine for (020) rsflBctioni, 0.53nm ipaeing for the layer Une repeat, streaking of filter Chrysotile -Avoided portion at (no) and (130) refleeUona. of fitter Por amphiboles; 0.a3nm layer line repeat, and approx. Portion of filter (Zmrn side) 3.5 ratio of nan-twinned layer Une spot apacing to subject to examination Amphibole layer Une repeat distance (0.52nm). EDS spectrum conforming to laboratory Identification criteria observed. AMPHIBOLES Ambiguous Fa Single Fiber (1-3 intersecLiona = 1-3 fibers) Amosite 3= Bundle f>3 fibers <1 fiber diametar apart) 2&mm filter Crocidolite Non—asbestos

□ C= Cluster (>3 intersections) f Stopping Rules: L Ms Matrix [* Anthophyllite NSDs No Structures Detected j >50 i/G.O. or in iat 4 G.O. Tremolite Pl Actinolite Non-Identified U\DATA\PRIVATE\M1KKC\CADD'5'KM3 9/22/20

NYC-WTC_000174874