Ambient air sampling report for 105 Duane Street, Feb 2002

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. - TEM ANALYSIS LAB GROUP # 5762 - 10/225/01 Filter Type MCE 25 mm Operator Lab Sample No. 62250 Filter Area m~~ 85 m 2 Client Spl. No. 36 v Disk No. Grid I.D. / Instrument I.D. EM LO CRX Comments (GO) Area 0.0 124 mm"2 Screen Magnification 16 400X to 70 s/mm 2

I f 4 72' Struct ^orsod No. GO to be Analyzed 6 Acc. Voltage 80 kV EDS Length I.D. of Structure N or (Nonasb. GO. Structure Structure Type Ambig./ND Elements >0.5 um Z Sum Chr s. Amphibole Nonasb. Yo Coord. No. F H C M 5 um

1 U If if S J 1(

u r I I II I 17, Stare all unrepeated spectre Identify all structures usin BDS structures ucti to 70e asbestoset 4) Photo No. from 1 in 5 asl tos- samples) •QOdis•"°°' Grid c507i undissolva r, over apps or o s Total Struct. = 0.5um k > 5:1 Aspect Ratio <lox particulate coverage >50% coverallssquares grid pattern) at least 20 unfolded or overlapped B C containing(BDS spectrum or diffraction Na Not Observed <5% holes or o a e areas F properties conforming ✓= Positive diffraction pattern criteria Unused portion to laboratory identification or niter Chrysotile Far ebrysoUls: 0.79nm apadn[ for (020) of scUons. avoldad portion the layer in• repeat. streaking 0.a3am pact ` for reflections. of filter of (110) and (190) Observed.Q(2mm_Ede) Amphibole 0.09nm layer line repeat, and ato For amPhlbolar. -twinned ratio of non layer line spot spacing in 3.5 layer line re peat distance (0.5m). Ambiguous ✓BDS •ppeeoctrum conforming to laboratory MPHI BOLES identification criteria observed. Amosite 1-3 fibers) F= Single Fiber (1-3 intersections = 20mm filter Croeidolite Non —asbestos B- Bundle (>9 fibers <1 fiber diameter apart) Stopping Rules: Anthophyllite C= Cluster (>9 intersections) „_ t..r rir .. .Mc n er In i•t 4 0.0. Tremolite j.,n_identified

NYC-WTC 000104127