Asbestos TEM analysis results, Oct 2001

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS LAB GROUP #: S74I - 10/23/01 Lab SampIs No. 61995 Filter Type MCE 25 mm Operator Client Spl. No. 36-10 Filter Area 335 mm*? Grid I.D. ’

Instrument I.D. BM 10 CRX Disk No. Screen Magnification 16z400X (GO) Area Q.01124 mm"2 Comments Acc. Voltage 80 kV No. GO to be Analyzed _4 ( 3.147 Struct. Corspd. to 70 3/Tnin^2J

GO. structure structure Type Length I.D. of Structure EDS >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 asbestos- Identify all structures using EDS Check diffraction for aabesloe J_____ _____ Jj Store all unrepeated spectra — containing samples) Grid acceptance:! atructures up to 7Qa/Am (let 4) <50% undisaolvea rilter£ overlapped or foldea , Struct. = > 0.5um & > 5:1 Aspect Ratio <10% particulate coverage >50% coverage Totals N= Not Observed (EDS spectrum or diffraction pattern) al least 20 unfolded or overlapped grid squares <5% holes or opaque areas £B£ M> Sum >^g^^^iina8d po^on ChiyauLilt! ucTteo’ lJ { U For amphibotes: Q.53d^^ l^^^ine repeat, and approx. [ ^^"*'^*hj,eet XH ) 01 Aia ‘c -i i lamnutsui 3.5 ratio of non** twinned layer line spot spacing to A m pH iHnlp —, layer line repeat distance (O.S3nm). OT- 5T N is qua7"3

EDS spectrum confoTn^fig-^Claboratory ului 5 2 S66II9 CN 3 ;duiBS identification criteria observed. AMPHI^nt.P.S Ambiguous F= Single Fiber (l-3 Interaections s 1-3 fibers) Ba Bundle (>3 fibers <1 fiber diameter apart) 2Smm niter Crocidolite Non-asbestos S- toSto ’’ ,--------- Isuppic. Rul«: I------- , Anthophyllite NSD= No Structure. Detected | >M ‘/g-O- " < g °- Tremolite J Actinolite Non-Identified L:\DATA\PWVATE\M1KEC\CADD\FEI(3 8/22/88

NYC-WTC_000174908