Ambient air sampling report for 105 Duane Street, Feb 2002

NYC 9/11 Public Portal Document

I ATC ASSOCIATES INC. - TEM ANALYSIS I LAB GROUP #: 5762 - 10,'25/01 Filter Type MCE 25 mm Operator Lab Sample No. 62243 Client Spl. No. 29 Filter Area A m-2

Grid I.D. Disk No. Instrument I.D. EM 10 CRX (GO) Area 0.01 4 mm-2 Comments Screen Magnification 16,400X No. GO to be Analyzed 6 f 4.721 Struct. Corsod. to 70 s/mm'2 Acc. Voltage 80 kV

EDS ure Type Length I.D. of Structure N or t/ (Nonasb. GO. Structure S No Coord. No. F B C M <~5 5um Chrys. Amphibole Nonasb. Ambig./ND Elements

3 7- / /1 ~Z f

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I rnoto tso. tarem a .a. ni . ..,.. .---- ,, --- - __ ewe rti_ o etrr.., i+.,~ fnr asbestos Let 4) Store all unrepeated spectra- Grid acceptance: structures u to 70a m containing samples) Struct. = > 0.5um & > 5:1 Aspect Ratio partic olve <50% undi. er, overlapped or o e coverage >50% coverage Totals I <10% particulate unfolded or overlapped grid squares Na Not observed (SOS spectrum or diffraction pattern) at least 20 <5% holes or opaque areas ✓ Poeftiva diffraction pattern properties conforming Unused portion to laboratory identification criteria observed. For cnrysoUln 0.73nm .we/ Ter (020) refieetien.. or toter Chrysotile 0.23nm spaolag for Ibs layer liras repeal.. streaking Avoided portion

I of (110) and (130) renecuona. or filter layer Ilse npea4 and appres. Portion of filter (2mm side) For amphibole.: OA3nm subiact to Amphibole 3.5 ratio of non-tinned taper line spot spacing to t ((( .+amlaatioa )) layer line repast distance (0.53nm)• Bas spectrum conforming to laboratory Ambiguous AMPHIBOLES identification criteria observed. P P= Single Fiber (1-3 Intersection. = 1-3 fibers) Bc Bundle (>3 fibers < 1 fiber diameter apart) 25mm filter Amosite Croeidolite Non —asbestos L C= cluster (>3 intersections) Mc matrix r >50Jis/G.O.11 Rules: or In let 4 G.O. Anthophyllite Tremolite NSD= No Structures Detected Non —Identified acfin~lite

NYC-WTC 000104120