Ambient air sampling report for 105 Duane Street, Feb 2002

NYC 9/11 Public Portal Document

LII ATC ASSOCIATES INC. - TEM ANALYSIS LAB GROUP it: 5761 - 10/25/01 Operator N~ Lab Sample No. 62185 Filter Type MCE 25 mm

Client Spl. No. 12 Filter Area 3 5 mm'2

Grid I.D. Disk No. Instrument I.D. EM 10 CRX 0.01124 mm-2 Comments Screen Magnification 16.400X (GO) Area No. GO to be Analyzed 6 ( 4.721 Struct. Corspd. to 70 arms' Acc, Voltage 80 kV

I Length I.D. of Structure EDS N or/ GO. Structure Structure Type (Nonasb. No Coord. No. 3 5um Chr s. Amphibole Nonasb. Ambig./ND Elemen ts) F B C M __ um

2 I 2 ~

t,

I.

I

I

I

I

I Struct. = 3. 0.5um & > 5:l edged Ratio _ Ijö7L particulato coverage >50% coverage N. Not Observed (EDS spectrum or diffracUo° pattern) at least 20 (let 4)

unfolded or overlapped grid square. <5% holes or opaque areas of H ✓a positive t r y iden caiopattern priteria s conf lag to laboratory identification criteria observed. a! rp°w°° Chrysotile Par ahryseWer 0.75nm .gaol far (020) runecU00s• 0.57■m .peeing for the IaAr lies spat. atrvaking Avoided portion of (110) and (ISO) ran cu°na of filter For ampblMt o O.e.am layer Ita npat, and appre.- Portion of ratter (2mm wide) Amphibole aubJ.et b 9.5 rstis er rata-twleoad kyer line .poi .peeing to ..amlaatio. Iarar I taae repeat dlMaese (O.OSom). ppee bng to laboratory Ambiguous ia rva AMPHIBOLES denllfic°.Uon ri teria econforrmii Amosite Pa Single Fiber (1-3 intersections - 1-3 fibers) 25mm niter Non — asbestos B= Bundle (>5 mbar■ <t fiber diameter apart) Crocidolite C. Cluster (>3 intersections) J ptng Rules: Anthophyllite M= Matrix >50 a/G.0. or In f.t 4 C.0. Tremolite NSD~ No Structure. Detected Actinolite Non —Identified

NYC-WTC 000104196