Asbestos TEM analysis results, Sep 2001

NYC 9/11 Public Portal Document

u ATC ASSOCIATES INC. TEM ANALYSIS n L7kS GROUP #: 5554 - Q9/24/01 Lab Sample No. 594^^ Filter Type MCE 25 mni Operator CttiP L.J Client Spl. No. 09-24-28 Filter Area 385 mm^2 Instrument t.d. EM 10 CRX Grid'I.D. /o Disk. No. Screen Magnification 16.400X (GO Area 0.01124 .mTn'^2 Comments Acc. Voltage 8 0 kV No. GO to be Analyzed _6 ( 4.721 Struct. Gorspd. to 70 s/mm^2.)

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

J & 4 /Y

C_J

L_J

Photo No. (from 1 in 5 asbestos- Identify all atructurea using EDS Check diffraction for asbestos Store ail unrepeated spectra r ■) containing samples) Grid acceptance:! structures up to 7Qa/^,im (Isl 4) <50% undisaolvea filLerr overlapped or folded Struct. = > O.oum & > 5:1 Aspect Ratio <10X particulate coverage >50% coverage Totals Not Observed (EOS spectrum or diffraction pattern) at leaet 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. -Unused portion of filter For chrysotile: 0.73nm spacing for (020) reflections, O.SSnm spacing for the layer line repeat, streaking Chrysotile -Avoided portion of (no) and (130) reflections. of niter For amphiboles: 0.53nm layer line repeat, and approx. Portion of filter (2mm wide) 3.5 ratio of non—twinned layer Une spot spacing to - ■object to examination Amphibole layer Une repeat distance (O.£3nm). v/= EDS spectrum conforming to laboratory Ambiguous identification criteria observed. AMPHIBOLES F= Single Fiber (1-3 intersections = 1-3 fibers) Amosite UJ 6= Bundle (>3 fibers <L fiber diameter apart) 25mni filter Crocidolite Non—asbestos C= Cluster (>3 intersections) ------- Stopping Rule*: !------------ M= Matrix f Anthophyllite N5D=s No Structures Detected >50 »/C.O. or In i«t 4 G.O. Tremolite Actinolite Non-Identified kXDATAXPWVATEXMlKECXCADD^TEMS 0/22/88

NYC-WTC_000174887