Ambient air sampling report for 105 Duane Street, Feb 2002

NYC 9/11 Public Portal Document

' ATC ASSOCIATES INC. - TENT ANALYSIS LAB GROUP #- 5759 -

Lab Sample No. 62543 Filter Tyce MCE _5 mm operat_r C L i- Client Spl. Mc 37 Filter Area 385 mm' 3 ( / Instrument I.0 EM 1U) CP1 Grid :. D . l C Disk No.

Screen Magnification 10,400X (GO) Area 0.01124 mm"3 Comments

Acc. Voltage 80 kV No. GO to be Analyzed o 4.'31 Struct. - orsod. to 70 s,mrn

1 GO. No Coord. Structure Structure Type No. FIB C M um <°: um Length A Sum ~Chrys. I.D. of Structure Amphibole EDS N or,/ (Nonasb. Nonasb. Ambig./ND Elements)

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El 1 Photo No. (from 1 in 5 asbestos- containing samples) Struct. _ > 0.5um & > 5:1 Aspect Ratio Identify all structures using EDS rn acveptanoe1 <50% undisaolve Check diffraction for asbestos structures uo to 70e/4 i er, overappe or o e <I0% particulate coverage >50.% coverage N= Not Observed (EDS spectrum or diffraction pattern) tat tenet 20 unfolded or overlapped grid squares (let 4) Store all unrepeated spectra J

Totals

<5% holes or opaque areas I Positive diffraction pattern properties conforming to laboratory identification criteria observed. Unused Peruon For chryaotite: 0.79nm .pactn` for (020) reflections. O.59am .paeiaj for the layer line repeat. streakinj of filter Chrysotile Molded parUoo of (110) and (190 reflection.. .f filter For amphibole.: 0.09nm layer tine repeat, and approe. Or On of Oiler (2mm vide) 9.3 ratio of non-twinned layer line spat spacing to .abject b Amphibole layer line repeat distance (0.53nm). e:am:naU.n

EDS spectrum conforming to laboratory identification criteria observed. i Ambiguous ! AMPHIBOLES F= Single Fiber (1-3 InteraecUana = 1-3 fibers) Amoeite B= Bundle (>3 fibers <1 fiber diameter apartl C= Cluster (>3 interweetiona) 25mm filter Crocidolite Non —asbestos gtppp,n uRg les: •tllthaph}rllite M Matrix NSDa No Structure. Detected >50 ■/ C.O. or in let 4 C.D. Tremolite Actinolite Non —identified = L:\DATA\PRIVATE\MlKEC\CADD~TEM3 9/22/98

NYC-WTC 000104304