Ambient air sampling report for 105 Duane Street, Feb 2002

NYC 9/11 Public Portal Document

I p ATC ASSOCIATES INC. - TEM ANALYSIS ¶ Lab Sample No. 62187 LAB GROUP i s 5761 - 10/25/01 Filter Type MCE 25 mm Operator

f . Client Spl. No. 14 Filter Area 3 5 m"2

Grid I.D. Disk No. Instrument I.D. EM 10 CRX (GO) Area 0.01124 mm"2 Comments Screen Magnification 16,400X No. GO to be Analyzed 6 ( 4.721 Struct. Corspd. to 70 sir Acc. Voltage 80 kV

EDS I.D. of Structure N or/ GO. Structure Structure Type Length (Nonasb. X0.5 um > 5um Amphibole Nonasb. Ambi ND Elements) No Coord. No. F H C M <5 um Chrys. g'~

Check diffraction for asbestos Store all unrepeated spectra Photo No. (from 1 in 5 as bestos- Identify all strueturee tailog EDS samples) Grid acceptance. structural up to 70s t;tm (tat 4) containing <50x undissoly tar, overlapped or [aIde Totals Struct. = > 0.5um & > 5:1 Aspect Ratio <10% particulate coverage >50% coverage at least 20 unfolded or overlapped grid squares Na Not Observed (S08 spectrum or diffraction pattern) <5%holesoro■tieareas F C > 5um B M poelUve diffraction pattern properties conforming t/ Unused portion to laboratory Identification criteria observed. For ehrysetles 0.77.m epael for (020) reflecUona. of filter Chrysotile 0.57om epecing for the layer tics repeat. streaking Avcldsd portion

I of (110) end (100) reaecUoae. of alts, portion of filter (2mm vide) For ampblboiei: 0.53nm layer Iles repeal, and Appros• .ub)eet Amphibole 3.5 ratio of non-twinned layer line spot epaaing to esamfwUen layer line repast distance ( .57nm).

✓- boratry AMPHIBOLES Ambiguous SOS ,e id c 4 criteria conformingto d.

1 intersections = 1-3 fibers) Aalosite ry F. Single Fiber (1-7 B= Bundle >8 fibers (I fiber diameter apart) mmm fitter Crocidolite Non — asbestos C= Cluster (>3 lntereectione) 8tappieg got. Anthophyllite M. Wtrls >50 a/C.O. arm let 4 C.O. Tremolite Non-Identified NSD= No Structures Detected Anl;nnlifa

NYC-WTC 000104198