Ambient air sampling report for 105 Duane Street, Feb 2002

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. - TEM ANALYSIS I LAB GROUP #: 5762 - 10/25/01

I Filter Type MCE 25 mm Operator Lab Sample No. 62242 _ Filter Area 38 2 6n Client Spl. No. 28 Disk No. Grid I.D. Instrument I.D. EM 10 CRX Comments (GO) Area 0.01124 mm"2 Corsod. to 70 s/mm 2. i

I Screen Magnification 16,400X 1 4.721 Struct. Nc. GO to be Analyzed o Acc. Voltage 80 kV EDS I.D. of Structure N ✓ (Nonasb. swewre Type Length g Structure GO. >j0.5 um 5um Chr s. Amphibole Nonasb. Ambig./ND Elements No Coord. No. F B C M < 5 um >.

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I I J Identify all ° (let 4) Photo No. (from 1 in S aebaatoa- 5" Grid acceptance: ■t* containing samplaa) <SO% undissolve er, o To a s I I Aspect Ratio coverage >50% coverage Slruct. _ > 0.5um 81 > 5:1 I i0% particulate erlapped grid equates leastr or diffraouon Pattern) N= Not Observed (BDS spectrum at unfoldeude osreae 20 or Positive diffraction pattern criteria properties conforming observed. Unused Portion to laboratory identification of filter Chrysotile 0.70em ■p.elot fer (020) reflections. Amlded portion For chry oils: lap■r Ucc repeat, streaking 0. nm sWaint for tbs of fil!■r 0.250m) and (I30) r■n.euona. of (1 Portion of niter (2mm side) Amphibole For amphiboles: 0 ins spear. and approx. m layer Iles■ ■pot ■pacing ■Apices 3.5 ratio of non-twinned taper eaaminaUea layer line repeat distance (0.W M)• Ambiguous to laboratory AMPHIBOLES BDS specwm conforming Idenuflcation criteria observed. Amosite F= Single Fiber (1-3 intersections = 1-3 fibers) 25mm nits Crocidolite Non —asbestos B= Bundle (>5 fibers <i fiber diameter apart) Anthophyllite Bteppmg a~.ee: C= Cuter (>9 Intersection■) Tremolite ~~ . set 4 CO lion -identified NYC-WTC 000104119