NYC-WTC_000177645

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS LA.B GROUP #: 5 3 09 - 10/'C5/01 Lab Sample No. Filter MCE 25 mm Operator Cli'2nt Spi . Nc - Filter Area 335 mm"2 Ins’-.rumenc I• E• EM IC Grid l.D. Orsk No. Screen Magnificaticn Lr., 40CX (GO) Arsa 0 . 01124 mm'^2 Comments Aco. Vol-age rO k'. NO. GO to be .Analysed !' 3 7 Struct. Corsz’d. co 70 3‘rnin

GO. Structure structure Type Length l.D. of Structure EDS n or >0.5 um (Nonasb. No, Coord. No. F B C M > Sum Chrys. Amphibole Nonasb. Ambig./NDi Elements) < 5 um i (a-zu kc / Z 4 II Zi

t Photci No. (from 1 In 5 asbeatoa- Identify all structurea using BPS Check diffraction for aabeatoa ______ _____ J unrepeated spectra—^ store ail containing samples) Grid acceptance:! structures up to TOs/^m (lat 4) Struct = > O.Surn Je > 5:1 Aspect Ratio <50% undissolveo filter, overlapped or folded <10X particulate coverage >50% coverage Totals N= Not Observed (EOS spectrum or diffraction pattern) at least 20 unfolded or overlapped grid squares <5% holes or opaque areas F B C M > Sum Positive diffraction pattei'n properties conforming to laboratory Identification criteria obaervad. -UnuMd portion Por chrysotile: 9.73nm spacing for (020) reflections, of niur Chrysotile Q.S3nm spacing for tbs layer line repeat, streaking Avoided portion of (110) and (130) reflocUona. of filler Per amphiboles: 0.S3nm layer line repeat and approx. Portion of niter (Smm wide! 3.5 ratio of non-twinned layer line spot spacing to ■ubject to examination Amphibole tarar line repeat distance 0.53nm). BUS spectrum conforming to laboratory Ambiguous Id'sntiflcatlon erttona observed. AMPHIBOLES F= aiiigie Fiber (1-3 interaectiana = 1-3 fibers) Amosite a= Bundle (>3 flbera <1 fiber diameter mart) Cliatar (>3 inLersecUons| 2Smm ruur Crocidolite Non-asbestos k= U.atrix I--------- J Stopping Rules: I ■ . Anthophyllite NS0» No Structurci Detocted >50 i/C.O. er In Ist 4 G.O. Tremolite Actinolite Non-Identified L:\DA1A\PRIVATE\MIKEC\CADD'7'EM3 fl/22/08

CONFIDENTIAL, CITY_21MC1OO_OO347363O SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000177645