Ambient air sampling report for 105 Duane Street, Feb 2002

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. - TEM ANALYSIS ...AE GROUP x. 0-49 - 1 3 i_: /0 ;1 -ac Sample No. 02516 _ Tyce MC! 'S ,nm wperaccr C ent Sol. No 13 Fitter Area 385 mm'- , Instrument I.D EM 10 _RX Gr_d I.D. (' Disk No.

I Screen Magnification 16,400X (GCI Area '' 01124 mm"2 Comrnencs

Acc. Voltage BO k7 No. GO to be Analysed 4.721 SCrur- _erspd. c '3 s/mm -

GO. Structure structure Type Length I I.D. of Structure N ori/ EDS I No Coord. No. 0 5 um (Nonasb. FIB C M < 5um >. 5um Chrys. Amphibole Nonasb. Ambig./ND Elements)

L u n I I C I I I Photo No. (from 1 in 5 asbestos- Identify all structures using EDS Check diffraction for asbestos Store all unrepeated spectra containing samples) IGrid acceptance: structures up to 70s/aim (let 4) 50% undiseolved filter, overlapped or folded Struct. _ > 0.5um k > 5:1 Aspect Ratio 10% particulate coverage >50% coverage I Totals No Not Observed (EDS spectrum or diffraction pattern) t leant 20 unfolded or overlapped grid squares holes or opaque areas I F B C M > 5um V' Positive diffraction pattern properties conforming to laboratory identification criteria Unused portion For chrysoWe: 0.77nm spacing for (020) roflectiona. of filter 0.57nm spacing for the layer line repeat, streaking Chrysatile of (110) end (170) reflections. Avoided portion of filter For ampblboles: 0.53nm layer line repeat, and appros. (2mm side) 3.3 ratio of non-twinned layer line spot spacing to Amphibole layer line repeat distance (0.53nm).

I EDS spectrum conforming to laboratory identification criteria observed. observed.&F:A~WHIBOLES F= Single Fiber (1-3 intersections = 1-3 fibers) B= Bundle (>3 fibers <1 fiber diameter apart) nnmm tiller Amosite Crocidolite I Ambiguous

Non —asbestos, C= Cluster (>3 intersections) M= watrill Stepping Rules: Anthophyllite I NSDrs No Structures Detected U\DATA\PRIVATE\YIKEG\CADD\TEn7 [ >s0 c/Ga. or in let 4 0.0. I

9/22/98 Tremolite Actinolite Non —Identified

NYC-WTC 000104280