Ambient air sampling report Book Two for 105 Duane Street,

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. - TENT ANALYSIS LAB GROUP #: 5770 - 10/26/O1 Lan Sample No. 62560 Filter Type MCE 25 mm Operator( t Client Spl. No. H-6 Filter Area 385 mm'2 Instrument I.D. EM 10 CRX Grid I.D. ` 7 Disk Nc. Screen Magncfiatlon 16,400Y. iGO) Area 0.01'24 mm' Comments Ace. Voltage 60 kv No. GO Co be Analyzed n 4.721 Struco. Corsnd to 70 s-mm'D.

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

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Photo No. (from 1 in 5 asbestos- Identify all structures usin EDS Check diffraction for asbestos Store all unrepeated spectra J containing samples) Grid acceptance: structures u to 704 tttm (1st 4) SLrueL = O.Sum & > 5:1 Aspect Ratio <50X undiasolve i er, overappe or o e <l0% particulate coverage >50% coverage Totals N= Not Observed (EDS spectrum or diffraction pattern) let least 20 unfolded or overlapped grid squares <5% holes or opaque areas Positive diffraction pattern properties conforming to laboratory identification criteria observed. Unused poruon Far ehrysaUia: 0.73nm ■paciag for (320) reflections. of filter Chrysotile 0.33nm spacing for the layer Ilse repeat. atreakma Avoided Portion of (110) and (130) reflacuone. of i4 FIlter For amphibotn: 0.03nm layer line repeat. and • to rox. p Portion of fluor (2mm wide) 3.3 ratio of pen-listed layer tine spat spacing to , sub ect to eaam~aaUan Amphibole layer line repeat distance (0.03nm).

EDS spectrum conforming to laboratory identification criteria observed. AMPHIBOLES Ambiguous F= Single Fiber (1-3 intersections = 1-3 fibers) Amosite B= Bundle >3 fibers <1 fiber diameter apart) 25mm filter Crocidolite Non —asbestos Cluster>3 intersection■) —.gtappin : Anthophyllite

I Ma Matrix Ca NSD= No Structures Detected >30 a/c.O. or in tat 4 c.0. Tremolite Actinaiite Non —Identified 1\DATA\PRIYATE\MIXEG\CAD0'2M3 9/22/98

NYC-WTC 000104340