NYC-WTC_000188643

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS LAB GROUP #: 5687 - 10/14/01 Lab Sample No. 61051 Filter Type MCE 25 mm Operator Client Spl. Nc. NSHS-EIR-10/13-08 Filter Area 385 mm"2 Instrument I.C. EM 10 CRX Grid I.D- Disk No, Screen Magnification 16,400X (GO) Area 0.01124 mm"2 Comments Acc. Voltage 8 0 k.V No. GO to be Analyzed Struct. Corspd. to 70 s/nin<2..)

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

IP V7

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Store all unrepcaLed spectra-^ Photo No. (from 1 in 5 aabeatoa— Identify all atructures uaing EDS Check diffraction for aabeatoa containing aamplei) Grid acceptance: I a true tu res up to 70a/i (l-l 4) <50X undiaaolved filter, overlapped or folded Struct s > 0.5um & > 5:1 Aapect Ratio <10% particulate coverage >50% coverage N= Not Obaerved (EDS spectrum or diffraction pattern) at ieaat 20 unfolded or overlapped grid aquarea Totals Positive diffraction pattern properties conforming <SX hole* or ooaoue area* F B C M > Sum to laboratory identification criteria obaerved. ■Unuaed poruon «( tiller Fer chrysotile: O.TSnm spacing far (020) reflecUans, O.SSnm apacing for the layer Jin* repeat, atreaielng Chrysotile of (110) and (130) reflecUona. Iwoidad ^rtlon of niter For smphibeiesi 0.53mn layer Una repeat, and approx. Portion of niter (2mm wide) 3.5 ratio of non-twinned layer line spot spacing to aubject to •xaminaUoB Amphibole layer line repeat dlatanee (0.53nm). \/a EOS spectrum conforming to laboratory Ambiguous identification criteria observed. AMPHIBOLES fs Single Fiber (1-3 inleraections s 1-3 flbera) Amosite Bs Bundle (>3 flbera <1 fiber diameter apart) Zfimm flltar Crocidolite Non-asbestos C= Cluater (>3 interwecLiona) ------ 1 supping Rule*: i--------- Ms Matrix Anthophyllite NSDs No Structure* Detected L:\DaTA\PRIVATE\ «I«C\CADD\rglia [ >50 a/C.O. er la let 4 C.O. Tremolite Actinolite Non-Identified 8/22/98

CITY_21MC100_003082186

NYC-WTC_000188643