NYC-WTC_000188644

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS LAB GROUP It ■ 5fi87 - in./14/ni Lab Sample No. 61063 Filter Type MCE 25 mm Operator Client Spl. No. NSHS-EIR-10/13-1C Filter Area 335 Instrument: I.D. EM 10 CRX Grid I.D. Disk No. Screen Magnification 16,400X (GO) Area ,0.01124 mm^2 Comnents Acc. Voltage 80 kV No. GO to he Analysed _4 3,147 Struct. Corspd. to 70 s/mm*2.)

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

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Photo No. (from 1 in 5 asbestos- Identify all structures using EDS Check diffraction for asbestos store all unrepcaLed spectra containing samples) Grid acceptance: i structures up 1to 7ps/&n (lit 4) <S0X undiasolved rilLer, overlapped or• foidea Struct, s > a,5um & > 5:1 Aspect Ratio <10X particulate coverace >50X coverage Totals N= Net Observed (EOS spectrum or diffraction pattern) at least 20 unfolded or overlapped grid squares Positive diffraction pattern properties conforming <SX holes or opaque areas F B C M > Sum to laboratory idenUficaUsn criteria observed. Jnussd portion For chryvoUle: 0.73nm esacing for (020) raflecUena, of mtar Chrysotile O.SOnm apaeing for the layer Tine repeat, streaking -Avoided portion at (110) and (130) rsnacUons. of filter For amphiboles: O.aSom layer line repeat, and approx. Portion of niter (Zmm wide) 3.3 ratio of non-twlnned layer Une spot spacing ta subject to Amphibole layer line repeat distance (O.S3nm). suminaUcn

y/s EDS spectrum conforming to laboratory Ambiguous identification criteria observed. AMPHIBOLES Fs Single Fiber (1-3 intersectlena = 1-3 fibers) Amosite Ba Bundle (>3 fibers <1 fiber diameter apart) C= Cluster (>3 intersections) ZSmm nitar Crocidolite Non-asbestos ------- i Slapping Rules: I--------- - Anthophyllite Ma Matrix NSDa No Structures Detected >30 x/C.O. er in 1st 4 C.O. Tremolite Non—Identified t.-\DATA\PRrV*TE\MIKEC\CADD\7EM2 8/28/OB Actinolite

CITY_21MC1OO_OO3O82188

NYC-WTC_000188644