Ambient air sampling report for 105 Duane Street, Feb 2002

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. - TEM ANALYSIS LAB GROUP #: 5762 - 10/25/01 Lab Sample No. 62265 Filter Type MCE 25 mm Operator Client Spl. No. 51 Filter Area 385 m Instrument I.D. EM 10 CRX Grid J.D. Disk No. Screen Magnification 16,400X (GO) Area 0.01124 mm-2 Comments

I Acc. Voltage

GO. 80 kV

Structure Structure Ty Length No. GO to be Analyzed 6

I.D. of Structure ( 4.721 Struct. Corspd. to 70 s/mm^2. 1

N orb/ EDS >0.5 um (Nonasb. No Coord. No. F S C M >. 5um Chrys. Amphibole Nonasb. Ambig./ND Elements < 5 um

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Photo No. (from 1 in 5 asbestos- Identify all structures usin EDS Check diffraction for asbestos Stare all unropeated spectra J containing samples) f T acceptance: <307L uadlasolve r, structures up to 708 orarappe or o a trim (1st 4) Struct. = ) 0.5um & > 5:1 Aspect Ratio <IO% particulate coverage >5(M coverage Na Not Observed (SOS spectrum or diffraction pattern) at lent 20 unfolded or overlapped grid ■guaree Totals <SX holes or opaque areas V toPositive diffraction pattern properties eoaformlag laboratory Identification criteria observed. Unused portion For ehrysotilr. 5.73nm .peel for (020) reflections. of filter O.Sanm ■pacing for the liperr lint o repeat, streaking Chrysotile of (110) and (100) reflections. Amided portion of filter For ampalbolas: 0.09am Isar lint re approx. PerUse meter (2mm side) 3.3 ratio of non-twinned toyar line spot spacing Amphibole layer tine repeat distance (0..553nm). eeamination

EDS spectrum conforming to laboratory identification criteria observed. AMPHIBOLES Ambiguous

I F. Single Fiber (1-3 Intersections = 1-3 fibers) Sc Bundle >5 fibers <1 fiber diameter apart) C Cluster (>3 Intersection.) N= Matrix NSD= No Structure. Detected 25mm fitter Stopping Rules: >50 ./G.O. or In lot 4 G.O. Arnasite Crocidolite Anthophyllite Tremolite I Non—asbestos . r; NYC-WTC 000104140