Ambient air sampling report for 105 Duane Street, Feb 2002

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. - TEM ANALYSIS LI Lab Sample No. 62202 LAB GROUP #: 5761 - 10/25/01 Filter Type MCE mm Operator Client Spl. No. 29 Filter Area 385 m 2 / Instrument I.D. EM 10 CRX Grid I.D. Disk No. Screen Magnification 16,400X (GO) Area 0.01124 mm-2 Comments Act. Voltage 80 kV No. GO to be Analyzed 6 4.721 Struct. Corspd. to 70 s/mm"2.)

GO. Structure Structure Type Length I.D. of Structure EDS N or t/ 30.5 um (Nonasb. No Coord. No. F B C M 5um Chrys. Amphibole Nonasb. Ambig./ND Elements) < 5 um Li 1 —

I I I

1 1 1 I Photo No. (from 1 to 5 asbestos- contetninng samples) Struct - > 0.5um k > 5:1 Aspect Ratio Identify all structures usin EDS Grid acceptance: <50% undissolve Check diffraction for aebestoe structures u b lde illm (lot 4) r, over apps r o Store all unropeated spectra

<10% particulate coverage >50% coverage Totals No Not Observed (EDS spectrum or diffraction pattern) lit least 20 unfolded or overlapped grid squares Ao Positive diffraction pattern propertlm conforming <5z holes or opaque area■ to laboratory identification criteria Unused peruse Per chyaatilm 0.73sm xC Ina for (020) reflecons. ti of flllar Chrysotile 0.53nm spacing for the layer line repeat. etreaking Avoided portion of (110) and (130) redlectiosa. of tileer Per ampbibolaa: 0.03nm layer tine repat and spproa. (2mm elde) 3.5 ratio of non-Intoned Is line spot spacing to Amphibole layer lire spat distance (0.03am). EDs spectrum conforming to laboratory Identification criteria observed. ~PHIBOLES Ambiguous Pc Single Fiber (1-3 Intersections c 1-3 fibers) observed.a F Amosite 9= Rundle (>3 fibers <1 fiber diameter apart) 25mm filter Crocidolite Non —asbestos r >3 Intersections) Ce ClusterM Stopping Rules: Anthophyllite NSD- No Structures Detected >00 s/0.0. or in let 4 G.O. Tremolit e Actinolite Non -Identified

NYC-WTC 000104212