Ambient air sampling report for 105 Duane Street, Feb 2002

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. - TEM ANALYSIS LAB GROUP #: 5761 - 10/25/01 Lab Sample No. 62194 Filter Type MCE 25 mm Operator ~P ~~

Client Spl. No. 21 Filter Area 38 mm 2 Instrument I.D. EM 10 CRX Grid I.D. Y~ `7 i 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;m

LI GO. Structure Structure Type Length I.D. of Structure N or/ EDS (Nonasb. No Coord. No. 30.5 um Chrys. Amphibole Nonasb. Ambig./ND Elements) F B C M < 5 um 3 5um

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cr.. 11 ..nreneaiad aectra- Photo No. (from 1 in 5 asbestos- Identify all structures using BDS Check diffraction for asbestos containing samples) Grid acceptance: structures up to 70.(&m (1st 4) <50% undiseolve r. overlapped or o e Struct. = > 0.5um k > 5:1 Aspect Ratio <IOx particulate coverage >50% coverage Totals squares N= Net Observed (209 spectrum or diffraction pattern) at least 20 unfolded or overlapped gri <5% holes or opaque areas Positive diffraction pattern properties conforming to laboratory Identification criteria Unused portion For ehr7seUlr. 0.flnm apucin[ i for (020) ruflsetions, of (liter Chrysotile 0.57am spacing for the layer tine repeat. streaking Avoided portion or ( to) and (100) r%Reeuona. of filter For amphibolae: 0.00em layer line repeat. and appros. (2mm aide) 0.0 rsUo of eon-twinned Isyer line spot spacing to Amphibole p layer line spat distance ( a0nm). l/= 603 spectrum conforming to laboratory Ambiguous identification criteria observed. PHIBOLES observed.aFil-Arricsite Fe Single Fiber (1-3 Interactions = 1-3 fibers) B= Bundle (>0 fibers <1 fiber diameter apart) 25mm filter Crocidolite Non —asbestos C= Cluster (>3 Intersections) 9top~R,1— Anthophyllite lIeMatrix > a/. Tremolite NSD= No Structures Detected Non -Identified Artinolite

NYC-WTC 000104204