Ambient air sampling report for 105 Duane Street, Feb 2002

NYC 9/11 Public Portal Document

I ATC ASSOCIATES INC. - TEM ANALYSIS r

LAS GROUP #: 5761 - 10/25/01

Lab Sample No. 62200 Filter Type MCE 25 mm Operator G1 Client Spl. No. 27 Filter Area 38 mm2

r Instrument I.D. EM 10 CRX Grid I.D. /t Disk No. Screen Magnification 16,400X (GO) Area 0.01124 mm"2 Comments

Acc. Voltage 80 kV No. GO to be Analyzed 6 4.721 Struct. Corspd. to 70 s/mm

I GO. Structure Structure Type 0 5 um Length I.D. of Structure EDS N or/ (Nonasb. No Coord. No. F B C M g tiyn 5um Chrys. Amphibole Nonasb. Ambig./ND Elements)

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I I Photo No. from 1 in 5 asbestos- containing samples) Identify all structures using SOS IGrid acceptance: I .c o undixiolvod filter, Check diffraction for asbestos structures up to 7oa &m (let 4) overlapped or folde Store all unrepeated spectra )

StrucL = ) 0.5um & > 5:1 Aspect Ratio <10% particulate coverage >50% coverage Totals N- Not Observed (SOS spectrum or diffraction pattern) lat least 20 unfolded or overlapped grid squares <5% holes or opaque areas F B C M >j 5um ✓= Positive diffraction pattern properties conforming to laboratory Identification criteria observed. Unused portion i I For obry■auls: 0.73nm epee! for (020) reflections, of niter Chrysotile 0.03nm spacing for the layer line repeat. streaking Avoided portion of (110) and (120) reflection.. or niter For amphibole•: 0.63nm layer line repent. and appre=. PortionJ.of niter (2mm vide 3.a retie or n.n-twinned Isyyeerr tine spot spacing to ammlnsUse to ) Amphibole flyer Una repeat distance (0.03nm). /a SOS spectrum conforming to laboratory Ambiguous identification criteria observed. AMPHIBOLES Pa Single Fiber (1-3 intersections - 1-3 fibers) Amosite B= Bundle (>3 fibers Cl fiber diameter apart) 25mm niter Crocidolite Non-asbestos Ce Cluster (>3 Intersections) Stopping Ralar. Antho P hYllite K. Matrix NSD- No Structures Detected >30 •/G.o. or In 1■t 4 C.O. Tremolite Actinolite Non-Identified NYC-WTC 000104210