NYC-WTC_000188692

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS LAB G.^OUP #: 574s - 10/23/01 Lab Sample No. Client Spl. Nc. 16 62Q70 .Iter Type MCE 25 mm Filter Area 385 mni^2 Operator AY Inscrumenc I.D. EM 10 CRX Grid I.D. Disk No.

Screen Magnification 16,400X (GO) Area 0 . 91124 mm^2 Comments Acc. Voltags 8 0 kV No. GO to be Analyzed __4 3.14? Struct. Corscd. rc 70 S''iTim^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)!

2 J

Photo No. (from 1 in 5 asbestos- Identify all atruotures using EDS Check diffraction for asbestoB Store all unrepeated spectra ccntaining samples) Grid acceptance:! struclurea up to TOa/i^m (l»l 4) <50% undisaolvea filter, overlapped or folded Struct. = > 0.5um b > 5:1 Aspect Ratio <10% particulate coverage >50% coverage Ns Not Observed (BOS spectrum or diffraction pattern) at least 20 unfolded or overlapped ^rid squares Totals 1^/= Positive diffraction pattern properties conforming <SX holes or opaque areas F B C M > Sum to laboratory Identification criteria observed. •Unused portion of filter For chrysotile: Q.7anm spacing for (020) reflections, O.sanm spacing for the layer line repeat, streaking Chrysotile -Avoided portion of (110) and (130) reflecUens. of filter For amphiboiea: O.SSnm layer line repeat, and approx. Portion of filter (2mm wide) 3.S ratio of non-twlnned layer Une spot spacing to subject to examination Amphibole layer line repeat distance (0.&3nm).

EDS spectrum conforming to laboratory identification criteria observed. AMPHIBOLES Ambiguous F= Single Fiber (1-3 IntersecUona s 1-3 fibers) Amosite 3= Bundle (>3 fibers <1 fiber diameter apart) C= Cluster (>3 intersections) 25mm filtar Crocidolite Non-asbestos J Stopping Rules; t , Anthophyllite Matrix NSD= No Structures Detected L’\ DATA\ PRIVATE\ MIKEC\ CADD\rEM3 [ >50 «/G.O. or in lot 4 C.O.

8/22/98 Tremolite Actinolite Non-identified

CITY_21MC100_003082583

NYC-WTC_000188692