Ambient air sampling report for 105 Duane Street, Feb 2002

NYC 9/11 Public Portal Document

ri ATC ASSOCIATES INC. - TEM ANALYSIS LAB GROUP #: 5761 - 10/25/01 Filter Type MCE 25 mm Operator Lab Sample No. 62196 Client Spl. No. 23 Filter Area 385 mm^2 Grid I.D. Disk No. Instrument I.D. EM 10 CRX IGO) Area 0.01124 mm2 Comments Screen Magnification 16,400X 80 kV No. GO to be Analyzed 6 ( 4.721 Struct. Corspd. cc 70 s/mm"2 Acc. Voltage

I Length I.D. of Structure N or/ EDS WGQ, Structure Structure Type g (Nonasb. X0.5 um > 5um Chr s. Am hib ole Nonasb. Ambi ND Elemen) No• F B C M ~ 5 um g'~

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ecc __ rr.. r1,., ra. aahewtns Store all unrepeated spectra- -rnoto no. tiram 1 ■a +. a awe ......-- j _.. ___ -.-- ----- --- containing samples) Grl acceptance: structures u to 705 iPtim (tat 4) <50% undissolve filter, overlapped or folde Tote Struct. = > 0.5um & > 5:1 Aspect Ratio pa rticulate coverage >50% coverage particulate N= Not Observed (SOS spectrum or diffraction at least 20 unfolded or overlapped grid squares pattern)1<5Z ~= Positive diffraction pattern properties conforming holes or opaque areas Unused portion to laboratory Identification criteria observed. For sbryaouls 0.77am .pfd for (020) rsnsctons. of nits Chryso tile O.Wnxn for the taper tins repent. streaking Avoided portion of (110) mad (170) ranectiona. of filter For amphlbalo: O&Um layer line repot. and approa• Portion of niter (amen wide) Amphibole 3.5 ratio of non-twinned layer lino spot spacing to aubloet b ss•a+ lnauaa p layer Iice repeat distance (O.s3nm} Vs E08 spectrum conforming to laboratory Ambiguous ldenUfloation criteria observed. Air(PHIB01.ES fibers) Amosite P= Single Fiber (1-3 Intersections = 1-3 a= Bundle (>7 fibers <1 fiber diameter apart) 25mm niter Crocidolite Non — asbestos C= Cluster (>7 intersections) Stopping Rules Anthophyllite u= atriaStructures Detected >50 a/0.0. or m lot 4 C.O. Tremolite Non -Identified NSD= No Actinolite NYC-WTC 000104206