Ambient air sampling report for 105 Duane Street, Feb 2002

NYC 9/11 Public Portal Document

I ATC ASSOCIATES INC. - TEM ANALYSIS LAB GRCUP X 5 55 - _'0/28,'01 Lan Sample No. 53517 Filter Type M75 25 mm Operator Client Spl No 11 Filter Area 385 mm~2 t Instrument I.D. EM 10 CRX Grid i .0 Disk No. Screen Magnification 16 402X GO! Area 2 21124 mm"_ Comments Acc. Voltage 80 kV Na GO Co be Analyzed 5 4. 7 7: Strut Crrstd. _ s mm':

I GO. No Coord. Structure Structure Type No. F B C M 30.5 um < 5um Length >. 5um Chrys.1 Amphibole I.D. of Structure EDS N or 1/ (Nonasb. Nonasb. Ambig./ND Elements)

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I I I I I I I I I Photo No. (from 1 in 5 asbestos- Store all unrepealed spectra

I Identify all structures using EDS Check diffraction for asbestos containing samples) IGrid acceptance:I structures up to 70s iim (let 4) <50% undlseolved filter, overlapped or folded I Struct. = > O.Sum M > 5:1 Aspect Ratio <10% particulate coverage >5Ox coverage Totals N= Not Observed (EDS spectrum or diffraction pattern)lat least 20 unfolded or overlapped grid squares <5% holes or opaque areas M Ji 5um Positive diffraction pattern properties conforming F B C

I to laboratory identification criteria observed. Unused porunn For chrysotile: 0.71nm spacing for (020) reflections, of filter Chrysotile 0.51noo spacing for the layer line repeat. streaking Avoided portion of (110) and (110) reflections, of filter For amphiboles: 0.53nm layer line repeat. and appros. Portion of filter (2mm .too) suelect to Amphibole

H 0.s ratio of non-twinned layer line spot spacing to layer line repast distance (0.50nm). exam maucn

205 spectrum conforming to laboratory identification criteria observed. AMPHIBOLES Ambiguous

F= Single Fiber (1-3 Intersections = 1-3 fibers) AII1091te S= Bundle (>3 fiber, <1 fiber diameter apart) 25mm filter Crocidolite Non — asbestos C= Cluster (>3 Intersections) M= Matrix sbPPtna safes: Anthophyllite NSD= Na Structures Detected >00 a/G.O. or In let 4 G.O. Tre(nolite Actinolite Non —Identified L\DATA\PIUVATE\MIKEC\CADD\TEM3 9/22/90

NYC-WTC 000104278