NYC-WTC_000209888

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS LA2 ORCC? ? 2 5 / 01 Lac Sample Me. Opersc iccP Cliar.c Spi Nc Area 3•£ S nirr?: Inscrumenc SM 10 CRX S ; D Y- Disk No. Screen Macnx:ica-ion 2c 400X I GO ' Area '-2124 Tim Comments Volcage 3 0 kV Nc. GO LG oe Ar.alL 4 S-r-, 5 ■ Tr

GO. structureT’T' Length I.D. of Structure i EDS --------- ----------------------- j---------------- ,---------------- ? (Nonasb. >0.5 um i No Coord. No. f b c Im T < 5 um Sum Chrys.i Amphibole I Nonasb. Ambig./NPj Elements) I

3^7 J —

n1I I i I L Photo I I in 5 asbestos- ! No. (from N I Identify i using EDS i I ail structures I Check diffraction for asbestos Store all unrepeated spectri containing samples) Grid acceptance:! structures uo to 703/i?im (IH 4) <S0X undiasolveo filter, overlapped or folded Struct. 3 > 0.3um de > 3:1 Aspect Ratio <10X particulate coverage >50X coverage N= Not Observed (EDS spectrum or diffraction pattern) at least 20 unfolded or overlapped grid squares Totals <5X holes, or opaque areas F M >- Sum y'- Positive diffraction pattern properties conforming B C to laboratory identification criteria observed. ■Unused portion For ehrysotlle: 0.73nm aoeeing for (020) renecUona. a.53nni apaeing ter the layer Une repeat, atreabinc of (HO) and (130) refleeUons. af niter -Avoided portion of niter Chrysotile i Por amphiboiea; O.S3nm layer line repeat, and approx. / / PorUon of filter ISmm side) 3.3 ratio of non-tvinned layer Une apoi spacing to I subject to Amphibole layer line repeat dlatanca (O.SSnm). H 'y BxamineUon // xZ- EDS apectrum conforming to laboratory identification criteria observed. AMPHIBOLES Ambiguous F= Single Fiber (i-3 IntersecUons = 1-3 fibers) Amoaite ( 8= Bundle f>3 fibers <1 fiber diameter apart) 2Smm niUr Crocidolite 1 Non—asbestos C= Cluster (>3 intersecLions) Stapping Rules: >------- M= Matrix .Anthophyllite i NSD= Na Structures Detected 1 >50 a/C.O. or in tat 4 C.O. ! Non-WenUfled U\DATA\PRIVATE\M1KEC\CADD'5'EM3 9/22/98

CITY_21MC100_002849253

NYC-WTC_000209895