Asbestos TEM analysis results, Sept 28, 2001

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS LAB GROUP #: 5574 - 09/28/01

Lab Sample No. 59645 Filter Type MCE 25 mm. Operator,

Client Spl..No. T28 Filter Area 385 mm^2 Instrument I.D. EM 10 CRX Grid I.D. Disk No.

Screen Magnification 16,400X (GO 'Area Q. 01124 mm'^2 Comments Aco. Voltage 8 0 kV No - GO to be Analyzed _6 4.721 Struct. Corsod. to 70 s/mm^2.)

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

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-Photo No. (from 1 in 5 asbestos— Identify all structureg using EDS Check diffraction for asbestos Store all unrepeated spectra containing samples) Grid acceptance:} structures uo to TOs/^m (1st 4) <50% undiasolvea filter, overlapped or folded Struct. = > 0.5um > 5:1 Aspect Ratio <10X particulate coverage >50X coverage Totals U N= Not Observed (EDS spectrum or diffraction pattern) at least 20 unfolded or overlapped grid squares <5% holes or opaque areas Positive diffraction pattern properties conforming F B C M > Sum to laboratory identification criteria observed. -Unused portion For chrysotile; 0.73nm Bpeelnr for (02C) FafiectianK. 0,53nm spacing for the layer line repeat, streaking of filler ■Avoided portion Chrysotile i I of (HO) and (130) reflections. of filter For amphiboles: O.SOnm layer line repeat, and approx. Portion of filter (2mm wide) 3.S ratio of non-twinned layer line spot ipaeing to lubject to exeminetion Amphibole layer line repeal distance (O.SSnm). vk= EDS spectrum conforming to laboratory Ambiguous n identification criteria observed. AMPHIBOLES F= Single Fiber (1-3 intersections = 1-3 fibers) Amosite B= Bundle (>3 fibers <3 fiber diameter apart) C= Cluster (>3 intersections) 25mm filter Crocidolite Non-asbestos ------- 1 Stopping Rules: L_ Anthophyllite Matrix NSD= No Structures Detected >50 s/G.O. or tn 1st 4 C.O. Tremolite Actinolite Non-Identified L:\DATA\PRIVATE\MIKEC\CADD^Eaa 9/22/SB

NYC-WTC_000174868