NYC-WTC_000188661

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS LAB GROUP It: 5T16 - 10/17/01 Lab Sample No 61540 Filter Type MCECErnm Cperaco Client Spl. Nt. N5HS-ECR-10,/17-S iter Arsa 36r mm Instrument I.D. EM IC CRX Grid I.D. Disk No. Screen Maqnification 16,400X (GO) Area C.01124 mm^2 Comments Acc. Voltage 8 0 kV Nc. GO co be Analyzed 4 3.147 Struct- Corspd. to 70 s/'mn'^2.>

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

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—Photo No. (from 1 in 5 aebestoa- Identify all ■l£ucUire«uain£MS Check diffraction for aabestoe Store ail unrepeated apectra containing samples) Grid acceptance:! structures up to TOs/i^n (l»l ♦) <S0X undieeoived filter, overlapped or folded Struct = > 0.5um > 5:1 Aspect Ratio <10X particulate coverafe >50X coverage Totals Ns Not Obaerved (EDS spectrum or dlffracUon pattern) at least 20 unfolded or overlapped grid squares ,/= Positive diffraction pattern properties conforming <SX holes or opaoue areas F B C M > Sum to laboratory identifleaUon criteria observed. Unuud porUon For ehrysoUio: O.TSnm speelnc for (020) reflections. of niter Chrysotile O.Sanm spacing for ths layer line repeal, streaidnc -Avoided portion sf (110) and (100) reflecttona. ol niter For amphiboles; 0.a3nm layer line repeat, and approx. Partion af ftltisr (£inin wide) a.S ratio of non-twinned layer Une spot spacing to •abject to •xamlnaUea Amphibole layer line repeat distance (0JS3nm). EOS spectrum conforming to laboratory Ambiguous identification criteria observed. AMPHIBOLES Fs Single Fiber (1-3 intersections = 1-3 fibers) Amosite Bs5 Bundle (>□ fibers <1 fiber diameter apart) ____________ Zatnm niUr Crocidolite Non—asbestos L I--------lst.ppln,Aul»: I-------- Anthophyllite NSD= No Strueturo. DotocUd | ./C-O. of Io 1.1 4 C.O. | Tremolite Non—Identified Actinolite UXEMTAXPRIVATTWIKECXCADirVEMS S/ZZ/BB

CITY_21MC100_003082302

NYC-WTC_000188661