Ambient air sampling report for 105 Duane Street, Feb 2002

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. - TEM ANALYSIS LAB GROUP #. 5 - 09 -

Lab Sample Nc. 52525 F:icer Type MCE 25 mm Operator

Client Spi. No. 19 Filter Area 385 mm-2

Instrument I.D. EM 10 CP.X Grid 1.0 DISK No. Screen Magnification 14. 400X (GOB Area 7.)1_24 mm'_ Comments

Acc Voltage 80 kV No. GO cc be Pnaiyzed 4 7 S_rucc Ccrsod, cc s'mm"2

Structure Structure Type Length I.D. of Structure EDS I GO. N or,/ (Nonasb. INo Coord. No. F B C M >0.5 < 5 um um >, 5am Chrys. Amphibole Nonasb. Ambig./ND Elements)

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D Photo No. (from 1 in 5 asbestos- IdenLify all structures usin EDS Check diffraction for asbestos Store all unrepeated spectra - containing samples) Grid acceptance: structures u to 70s f~tm (lot 4) Struct. _ > 0.Sum & > 5:1 Aspect Ratio <50x undlssoive i er, overappe or o e <10% particulate coverage >50% coverage Totals N= Not Observed (Ens spectrum or diffraction pattern) pat least 20 unfolded or overlapped grid squares <5% holes or o a tie areas Positive diffraction pattern properiles conforming La laboratory identification criteria observed. Unused portion Par chrysoUls: 0.73nm apacin( for (020) reneetiona, 0.53nm apameg for the Mayer line repast. as streak.ag of filter Chrysotile Avoided pardon of (110) and (130) reflections. of filter For amphiboles: O.5Dnm layer line repeat. and approx. PorUon of filter (2mm wide) 3.5 ratio of non-twinned layer line spot spacing to subject Io ezammaUon Amphibole layer line repeat distance (0.57nm). EDS spectrum conforming to laboratory Ambiguous Identification criteria observed. AMPHIBOLES F= Single Fiber (1-3 intersections = 1-3 fibers) Amosite 8= Bundle (>3 fibers <l fiber diameter apart) Cluster (>3 intersections) 25mm filter i Crocidolite Non-asbestos Stepping Rule.: Anthophyllite MaUls NSD= No Structures Detected >50 5/G.0. or in let 4 0.0. Tremolite C= Iii Actinoiitc Non -Identified L`DATA\PRIVATE\MIKEG\CADOVEM7 8/22/98

NYC-WTC 000104286