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. 62217

Client Spl. No. 3 Filter Area /3,85~mm-2 Grid I.D. T'/2!'V Disk No. Instrument I.D. EM 10 CRX (GO) Area 0.01124 mm'2 Comments Screen Magnification 16,400X No. GO to be Analyzed 6 ( 4.721 Struct. Corspd. to 7C s/mm"2.' Acc. Voltage 80 kV

Length I.D. of Structure N or L/EDS GO. Structure Structure Type (Nonasb. 0 5 um No Coord. No. F B C M < 5 um 3 Sum Chrys. Amphibole Nonasb. Ambig./ND Elementh) / '~~ I 2 ,€/ .—--- —cv —v J 2~ —

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II L Photo No. from 1 in 5 asbestos- containing samples) Identify all structure. usin EDS G acceptance: Check diffraction for asbestos structures u to 70s tetm (let 4) Store all unrepeated spectra

<50i undlssolve r, over apps or o a Struct. _ > 0.5um & > 5:1 Aspect Ratio <CM particulate coverage >50S coverage Totals C Na Not Observed (EDS spectrum or dlffraeUon pattern) at least 20 unfolded or overt;pped grid squares t~ Positive diffraction pattern properties conforming to laboratory identification criteria observed. For ehryaomas o.ranm .plant for (020) renaatlons, DA.7nm spacing for the layer 11n. ripest. streaking <5x holes or opaque areas C Unused portion of niter Avoided portion Chr sotile y of (110) and (130) renectlatm of niter

1 For smpblbola: 0.530m Layer Use ripest. and appres. 3.5 ratio of man-twinned layer ties spot spacing to layer Use repeat distance (0.53nm). v/= 908 spectrum conforming to laboratory Identification criteria observed. Portion of filler subject to as•mfnation (2rmm ti de)

AMPHIBOLES Amphibole

Ambiguous

I Pa Single Fiber (1-3 intersections - 1-3 fibers) Amosite B= Bundle >3 fibers <1 fiber diameter apart) 25mm filter Crocidolite Non-asbestos Ca Cluster (>3 intersections) K Matrix Stoppi ng Rules: Antho h llite NSD- No Structures Detected a50 s/G.O. or In III 4 a.o. Tremolite Actinolite Non-Identified

NYC-WTC 000104095