NYC-WTC_000188713

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS LAB GROUP #; 5784 7/01 Lab Sample Ko. 62354 Filter Type MCE 25 mm Operator 7/2 Client: Spi. No. 9 Filter Area 385 mm"~2 Instrument I.D. EM IC GRX Grid I.D. Disk No. ----- Screen Maonification 16,4QQZ (GO; Arsa 0 ■ 01124 m"2 Consents Acc. Voltage 80 kV No. GO to be Tmaiyzed _4 147 Struct. Corsfd 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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Store all unrepeated spectra-^ Photo No. (from 1 in 5 asbeatoa- Identify all atructurea uaing EDS Check diffraction for aabeatoa containing samples) Grid acceptance:! atructurea up to yOa/^m (lat 4) <50X undisaolvea filter, overlapped or folded Struct. = > O.Sum & > 5:1 Aspect Ratio <IOX particulate coverage >50% coverage Ns Not Observed (EDS spectrum or diffraction pattern) at least 20 unfolded or overlapped grid squares Totals Positive diffraction pattern properties conforming <5X holes or opaque areas F B C M > Sum Lo laboratory Identification criteria observed. -Uaueed portion of filler For chrysotile: Q.73nm spacing for (020) reneetlons, O.bSnm spacing for the layer line repeat, streaking Chrysotile of (HO) and (130) reflections. ivoided portion of filler For amphiboles: O.sanm layer line repeat, and appro*. Portion at filter (2mm wide) 3.5 ratio of non-twinned layer line spot spacing to ■ubjacL Lo nxaminetion Amphibole layer line repeat distance (O.fiSnm).

vks EDS spectrum eonforminc to laboratory identification criteria observed. AMPHIBOLES Ambiguous Fs Single Fiber (1-3 Interaectlona s 1-3 fibers) Amosite B= Bundle (>3 fibers <1 fiber diameter apart) ' C= Cluster (>3 intersections) ZSmm filler p stopping Rules: L Crocidolite Non-asbestos Ms Matrix r Anthophyllite NSD= No Structures Detected { >50 a/G.O. or In let 4 G.O. Tremolite Actinolite Non-Identified UXDATAXPRIVdTEXmXECXCADDTEUS 0/22/96

CITY_21MC100_003082755

NYC-WTC_000188713