Ambient air sampling report for 105 Duane Street, Feb 2002

NYC 9/11 Public Portal Document

' ATC ASSOCIATES INC. - TEM ANALYSIS LAB GROUP it- 5759 - 17'25 01 ( Lab Sample No 62530 Filter Type MCE 25 mm Operator - ~, Client Spl. No. 24 Filter Area 355 mm"2 II Instrument I.D EM 10 CP.X Grid I.D. Disk No. Screen Magnification 16,400X '.GO: Area 2.01124 mm'_ Acc. Voltage 80 kV No. GO to be Analyzed 4.72. Struct. Corsod. to 70 s -mm

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

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Photo No. (from 1 in 5 asbestos- Identify all structures using EDS Check diffraction for asbestos Store all unrepealed spectra conta ini ng samples) I.GrIl acceptance: structures u to 70e r11tn (let 4) I <10% undlasolve t r, over or o e Struct. = > 0.5um & > 5:1 Aspect Ratio <I0% particulate coverage >50% coverage Totals Na Not Observed (EDS spectrum or diffraction pattern) t least 20 unfolded or overlapped grid squares <5% holes or opaque areas Positive diffraction pattern properties conforming to laboratory identification criteria observed. Unused portion Par ahry.otila: 0.77nm .pacing roc (020) reflections. of cuter Chrysotile 0.57nm spacing [or the layer line repeat, . .kin. Avoided portion of (110) and (130) reflections. of filter Per amphiboles: 0.53nm Layer line repeat, and appre[. Portion of filter (2mm wide) 3.5 ratio of son-twinned layer line spot .pacing to .object la vaammation I Amphibole layer line repeat distance (0.53nm). EDS spectrum conforming to laboratory r AMPHIBOLES ~ Ambiguous identification criteria observed. P= Single Fiber (1-3 Intersections = 1-3 flbcra) j AIIloslte B= Bundle (>3 fibers <1 fiber diameter apart) 25mm filter i Crocidolite Non —asbestos C= Cluster (>7 Intersections) (—stopping Buln: Anth°phylhte M- Matrix oS a/e.o. or In fat 4 Trernolite NSD= No Structures Detected Non —Identified Actinolite L\DATA\PmVATE\ wiKSc\cADDV'EM7 9/22/08

NYC-WTC 000104291